You can still backslash the newline at the end of a line to join two lines together. Does a hash function necessarily need to allow arbitrary length input? Doesn't work for me. So a continuation line without an indent is one way to break up a string: $ echo "continuation"\ > "lines" continuationlines. Aliases are expanded when a command is read, not when it is executed. How to get the source directory of a Bash script from within the script itself? sh ~/bin/script.sh . The bash backslash character is intended to escape the newline and not the space character. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. I came across a situation in which I had to send a long message as part of a command argument and had to adhere to the line length limitation. How do I tell if a regular file does not exist in Bash? If you want to break up a command so that it fits on more than one line, use a backslash ( \) as the last character on the line. It does not seem to work. IFS variable. The existence of the file will be a signal to any subsequent instance of the script not to run. I have a problem sometimes when I copy code from the Hey, Scripting Guy! B. BSD) kompatibel halten wollen, können wir auch statt /bin/bash, /bin/sh schreiben. How do I split a string on a delimiter in Bash? Oracle Scripts Ion Excel-DB ... Linux line continuation . Required fields are marked *, {{#message}}{{{message}}}{{/message}}{{^message}}Your submission failed. Further, you called an executable as part of a string interpolation- something that a person asking this kind of question would definitely not have seen yet in bash. I'm working on a new exercise that calls for a script that will take in two arguments on the command line (representing the range of line numbers) and will subsequently print those lines from a a specified file. /bin/bash echo 'Hello, World!' Podcast 302: Programming in PowerPoint can teach you a few things, BASH: Trying to continue a string on another line without introducing white space, git config --global user.email Wont let me change email after reinstalling, Multiline bash using sed to remove leading whitespace: quotes erroneously preserved in command argument, Store output of very long command in a variable multiline in bitbucket-pipelines.yml. Tipps & Tricks, um Fehler zu vermeiden. How to mount Macintosh Performa's HFS (not HFS+) Filesystem. Bash will print the continuation prompt, usually a >, to indicate that this is a continuation of the previous line. However, there are cases where commands are implicitly continued, namely when the line ends with a token than cannot legally terminate a command. The next instance of the script will check for the existence of the file to determine if it is safe to execute. ref: whrl.pl/Rc455J. When the script exits, you delete the file. Allerdings bietet die Bash … Bash – spezielles zur Bourne again shell. As you can see, knowing about the Bash read function, and also knowing the Bash shell case function, are both important in this solution. Though the question wasn't about variables, using echo was only an example. Making statements based on opinion; back them up with references or personal experience. A non-quoted backslash ‘\’ is the Bash escape character. A basic lock file is when you create a file to be used as a lock. Bash provides only single line comments. the value of each array member separated by the first character of the ...In the context where an assignment statement is assigning a value to a shell variable or array index, the += operator can be used to append to or add to the variable's previous value. Join Stack Overflow to learn, share knowledge, and build your career. Line in bash script to wait for x feedbacks and then continue I have a script that runs a console/terminal command on the server and what is want is for each of the multiple success reports fed back from the clients (echo-ed out onto the conosle) to be counted and after x number of reports reboot the server. How can I check if a directory exists in a Bash shell script? Your email address will not be published. Learn More{{/message}}, Next FAQ: HowTo: Python Convert a String Into Integer, Previous FAQ: HowTo Install firefox-8.0.tar.bz2 in Linux, Linux / Unix tutorials for new and seasoned sysadmin || developers, Linux Force fsck on the Next Reboot or Boot Sequence, Linux sys-unconfig: Reconfigure the System Upon Next Boot, Bash Script: Find Out In What Directory Script Is…, Shell Script Put Multiple Line Comments under Bash/KSH, Linux/UNIX: Bash Read a File Line By Line, Explain: #!/bin/bash - or #!/bin/bash --…. How to prevent players from having a specific item in their inventory? site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Expert Oracle Database Tips by Donald BurlesonMarch 22, 2015. Why do "checked exceptions", i.e., "value-or-error return values", work well in Rust and Go but not in Java? Sometimes ansible is not enough, and you want to unleash the raw shell power. Zuerst öffnen wir mit dem Editorunserer Wahl ein neues Dokument und schreiben in die erste Zeile: Diese Zeile wird auch Shebang genannt und definiert mit welchem Kommandointerpreter (also welcher Shell) das Script ausgewertet werden soll. I will try to be as detailed as possible so even a beginner to Linux can easily understand the concept. It preserves the literal value of the next character that follows, with the exception of newline. In bash, placing two strings next to each other concatenate: So a continuation line without an indent is one way to break up a string: You get two arguments because this is no longer a concatenation. This probably doesn't really answer your question but you might find it useful anyway. In that case you may use continue to stop the execution of commands over the present value but continue with the next value in the series. However, if you want bash to read your script line by line, then you must introduce a … This is especially good if you have a very long pipeline with incorporating numerous cmdlets. The only exception to this rule is #! To do this, simply end the first command with a semicolon and start the next command immediately after. maskiepop. How do the material components of Heat Metal work? Even though the server responded OK, it is possible the submission was not processed. In certain scenarios utilizing Bash's concatenation ability might be appropriate. In Bash everything after the hash mark (#) and until the end of the line is considered to be a comment. Is Dirac Delta function necessarily symmetric? Please contact the developer of this form processor to improve this message. The third command makes that script executable. I get two lines instead of expected concatenated one line. The line “#!/bin/bash” is referred to as the shebang line and in some literature, it’s referred to as the hashbang line and that’s because it starts with the two characters hash ‘#’ and bang ‘!’. Ubuntu 16.04. posted 2012-Feb-8, 11:06 am AEST edited 2012-Feb-8, 11:11 am AEST. Asking for help, clarification, or responding to other answers. On many of the Linux system’s I’ve worked on, sh was a symlink to bash. How to read command line arguments in shell script? Why doesn't IList only inherit from ICollection? In general, you can use a backslash at the end of a line in order for the command to continue on to the next line. Bash always reads at least one complete line of input before executing any of the commands on that line. Posted on Tuesday December 27th, 2016 Friday February 24th, 2017 by admin. Skripte Beispiele, welche die breite Anwendbarkeit von Bashskripten ein … Using continue in a bash for loop. Here documents with the <<-HERE terminator work well for indented multi-line text strings. The arguments to the interpreter consist of one or more optional arguments following the interpreter name on the first line of the script file, followed by the name of the script file, followed by the rest of the arguments supplied to the script. your coworkers to find and share information. Well-intentioned- and possibly even useful- though this may be, the OP asked for advice on basic bash syntax, and you gave him a python function definition which uses OO paradigms, exceptional flow control, and imports. Instead of. The server responded with {{status_text}} (code {{status_code}}). What would make a plant's leaves razor-sharp? Wed Jun 21 14:33:07 2006: 2137 BigDumbDInosaur For some strange reason, I've seldom used continuation characters to break up overly-long lines. posted 2012-Feb-8, 11:06 am AEST (edited 2012-Feb-8, 11:11 am … If a \newline pair appears, and the backslash itself is not quoted, the \newline is treated as a line continuation (that is, it is removed from the input stream and effectively ignored). For example: #!/bin/bash # this is a comment echo "Comment Example" Here’ # this is a comment’ is a comment, and when we run this script compiler will ignore the line. Participant reference: whrl.pl/Rc455J. Komplexität reduzieren¶ Für sich genommen sind die Punkte leicht zu verstehen - alleine, wenn sie sich zu einer Einheit verknüllen, wird die Frage doch ein wenig komplex. When your script contains long command lines, bash will continue to read the commands non-stop; if the cursor gets to the right-hand end, bash continues to the next line automatically. A non-quoted backslash ‘\’ is the Bash escape character. But a here document becomes a stdin, so it needs to be read back in, I went with the below approach: This has the advantage that $message can be used exactly as the string constant with no extra whitespace or line breaks. Depending on what sort of risks you will accept and how well you know and trust the data, you can use simplistic variable interpolation. Wenn wir das Script auch für andere Unix-Systeme (wie z. How can i split my long string constant over multiple lines? Command line would look like this: ./lines_script.bash 5 15 -lrt ---- <1> this is line 1 The issue it seems is that the callout mechanism requires a space to be added at the end of line 1 of the bash script in order for the <1> to be recognized. rev 2021.1.11.38289, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide, The answers clearly demonstrate how fun the bash language is :-). In this tutorial, we will discuss how to read a file line by line in Bash. bash bin/script.sh . The following command is used to compile and install nginx web server. Bash Split String – Often when working with string literals or message streams, we come across a necessity to split a string into tokens using a delimiter. Um die Komplexität anzugehen, sollte man die Konzepte isoliert voneinander verstehen - das ist einfach. Can index also move the stock? However, if you have indented code, it doesn't work out so well: If this creates two arguments to echo and you only want one, then let's look at string concatenation. -arg5 -arg6. there is an extra space, because (after bash manual): If the word is double-quoted, ${name[*]} expands to a single word with Comments are ignored while executing the commands in a Bash Script file. @PengheGeng Indeed, this solves the problem of getting rid of indentation, not the one of joining lines together. Note that the actual message lines above are prefixed with a tab character each, which is stripped by here document itself (because of the use of <<-). So, strip of extra spaces only if applicable. the backslash \ is a line continuation character: syntactically, it makes your command into a single line (the opposite of what you want) Try with single quotes and concatenating the strings: Note: the concatenation includes a whitespace. Note that if you really want to use this script, it makes more sense to move the executable script into ~/bin so that it will be in your path. Please contact the developer of this form processor to improve this message. It will remove any leading tabs from the here document. How to split strings over multiple lines in Bash? which is shebang and is used to indicate which shell to be used to process the script. Post your clever one-liners, search, login using SSO or Open ID. In some cases, you may be able to workaround by removing the double-quotes around $message, but the message will no longer be a single argument. For example, you may have a text file containing data that should be processed by the script. $ printf "%s\n" "This is a very long printf. -arg3 -arg4 \ Single line comments in bash script. If a US president is convicted for insurrection, does that also prevent his children from running for president? The fourth command provides a usage example. Thanks for your help, but while this does remove the spaces, they are now separate parameters (Bash is interpreting the spaces on the second line as a parameter separator) and are now only printed correctly because of the echo command. There are also times when you want to break the execution of the series of commands, for a certain value on the series, but do not stop the complete program. Comments are strings that help in the readability of a program. Thanks for contributing an answer to Stack Overflow! It’s hard to know, since by convention, shell scripts have the “shebang” as the first line (#!/bin/bash). In the bash script, any line that starts with # is considered a comment. (Line terminators will still remain, though. A collection of practical and well-explained Bash one-liners and shell script tips, tricks, snippets for GNU Linux, UNIX or BSD systems. Any line starting with the hash/pound key # is treated as comment in bash. Bash Comments – In this tutorial, we shall learn how to provide single line and multiple line comments in a Bash Script file. In bash, placing two strings next to each other concatenate: $ echo "continuation""lines" continuationlines. ShellCheck – Werkzeug zur Analyse von Bash- und Shell-Skripten. Specifically, the \(, \)and \;are there so that the shell doesn't interpret the escaped characters and passes them as-is to find. #! I see now. How to check if a string contains a substring in Bash. It preserves the literal value of the next character that follows, with the exception of newline. If the file does NO… Very often in bash scrips you need to ask for user input that requires a Yes or No answer. You could simply separate it with newlines (without using backslash) as required within the indentation as follows and just strip of new lines. Do GFCI outlets require more than standard box volume? Adding comments to your Bash scripts will save you a lot of time and efforts when you look at your code in the future. In general, if you want to break a command, you need the \unlessyou break on one of the "list terminator"characters. A backslash (\) is used as to continue command on the next line: Your email address will not be published. The details of how the interpreter line is split into an interpreter name and a set of arguments vary across systems. Listing Multiple Commands on One Line . This isn't exactly what the user asked, but another way to create a long string that spans multiple lines is by incrementally building it up, like so: Obviously in this case it would have been simpler to build it one go, but this style can be very lightweight and understandable when dealing with longer strings. If you would like a single string which crosses lines, while indenting but not getting all those spaces, one approach you can try is to ditch the continuation line and use variables: This will allow you to have cleanly indented code at the expense of additional variables. Generally, Stocks move the index. But when an indent is used: $ echo "continuation"\ > "lines" continuation lines. In the above example, we are using a simple if statement to check if a file exists. Beginnen wir mit einem ganz einfachen Script ohne irgendwelche Verzweigungen und Parameter. Why is this a correct sentence: "Iūlius nōn sōlus, sed cum magnā familiā habitat"? (Ba)sh parameter expansion not consistent in script and interactive shell. It works with echo and string arguments, but it doesn't work with other things, like variable assignment. In that case, the shell knows that more is coming, and the backslash can be omitted. In this tutorial we will cover these questions covering bash script arguments with multiple scenarios and examples. To learn more, see our tips on writing great answers. How Functional Programming achieves "No runtime exceptions", What's the meaning of the French verb "rider". … commannd1 -arg1 -arg2 \ What is the role of a permanent lector at a Traditional Latin Mass? Sometimes, listing more than one command on a single command line may be desired. Command-Line Tips and Tricks. Blog. last updated – posted 2012-Feb-9, 10:41 am AEST posted 2012-Feb-9, 10:41 am AEST User #455434 117 posts. If the file exist, the script exits (cannot get lock). How to pass arguments to a function inside shell script in bash? Turning off auto indent when pasting text into vim, How to concatenate string variables in Bash. When applied to a string-valued variable, value is expanded and appended to the variable's value. HowTo: Python Convert a String Into Integer, HowTo Install firefox-8.0.tar.bz2 in Linux, 30 Cool Open Source Software I Discovered in 2013, 30 Handy Bash Shell Aliases For Linux / Unix / Mac OS X, Top 32 Nmap Command Examples For Linux Sys/Network Admins, 25 PHP Security Best Practices For Linux Sys Admins, 30 Linux System Monitoring Tools Every SysAdmin Should Know, Linux: 25 Iptables Netfilter Firewall Examples For New SysAdmins, Top 20 OpenSSH Server Best Security Practices, Top 25 Nginx Web Server Best Security Practices. Using a HEREDOC and piping into a translate for s is super unintuitive and fails when the string actually needs to have discretely placed line separators. If the usage of $'...' or "$(...)" is confusing to you, ask another question (one per construct) if there's not already one up. How to pull back an email that has already been sent? I have a hunch that I got used to wrapped lines from the days when I had to punch in machine code using a Teletype (that was very long ago), where every keystroke was an exercise in shortening your finger length. Reading a File Line By Line … Open-source project, using Django, Python, jQuery, Git, GitHub, HTML5, Bootstrap from Twitter. Therefore, an alias definition appearing on the same line as another command does not take effect until the next line of input is read. Bash/Hilfe – Hilfe zu Befehlen und Kommandos der Bash aufrufen. Archive View Return to standard view. Example: MySQL Backup Shell Script. Note also that if you don't remove newlines, they will appear as is when "$message" is expanded. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How can I check if a program exists from a Bash script? In this tutorial, we shall learn how to split a string in bash shell scripting with a delimiter of single and multiple character lengths. If a \newline pair appears, and the backslash itself is not quoted, the \newline is treated as a line continuation (that is, it is removed from the input stream and effectively ignored). Intersection of two Jordan curves lying in the rectangle. The commands looks something like this: The way I solved this is to move the message out as a here document (like @tripleee suggested). Check the python reference for details on how textwrap.dedent works. Summary: How to read Bash script command line arguments. Here is some example code: Thanks to David for the updated code. Probably the best advice on this page. The SheBang line at the beginning of shell script. Learn More{{/message}}, {{#message}}{{{message}}}{{/message}}{{^message}}It appears your submission was successful. The delimiter could be a single character or a string with multiple characters. Blog “Yes/No” in Bash Script – Prompt for Confirmation. ), See also http://ss64.com/bash/syntax-here.html, If you need to preserve some, but not all, leading whitespace, you might use something like, (The second line has a tab and a space up front; the tab will be removed by the dash operator before the heredoc terminator, whereas the space will be preserved.). It might be nice to provide a link to the question you find/ask so that other people will have a linked reference. Here is how you can do it with YAML multi-line representation: When bash is started as “sh”, it behaves differently (sort of brain dead), but I think it still supports the double bracket. For wrapping long complex strings over many lines, I like printf: It also works well in contexts where you want to embed nontrivial pieces of shell script in another language where the host language's syntax won't let you use a here document, such as in a Makefile or Dockerfile. When += is applied to a variable for which the integer attribute has been set, value is evaluated as an arithmetic expression and added to the variable's current value, which is also evaluated. If you make the variables local it should not be too bad. The first command creates the script that's displayed by the second command. When += is applied to an array variable using compound assignment (see Arrays below), the variable's value is not unset (as it is when using =), and new values are appended to the array beginning at one greater than the array's maximum index (for indexed arrays) or added as additional key-value pairs in an associative array. When writing Bash scripts, you will sometimes find yourself in situations where you need to read a file line by line. Stack Overflow for Teams is a private, secure spot for you and The rest, the \that aren't immediately before a non-space character are line continuation signals. help with bash script continuation lines. because there’s nothing after the pipe symbol PowerShell assumes that the next line of code is actually a continuation and treats the 2 lines of code as a single pipeline. But long one-line scripts look totally unreadable. I hope this example of how to read shell script command line arguments has been helpful. , not the space character if the file to determine if it is possible the submission was not.... Treated as comment in Bash ignored while executing the commands in a Bash script arguments multiple! There are still line breaks at the end of a Bash shell?. S\N '' `` this is especially good if you have a problem sometimes when I copy code from Hey! From a Bash script from within the script that 's displayed by second. Applied to a string-valued variable, value is expanded also feasible with a semicolon start. Item in their inventory and interactive shell a Yes or No answer user input that requires a Yes No. Script ohne irgendwelche Verzweigungen und Parameter Jun 21 14:33:07 2006: 2137 BigDumbDInosaur for some reason. `` $ message '' is expanded and appended to the question you find/ask so that other people will have text. It preserves the literal value of the loop by skipping the rest of the French verb rider! Tuesday December 27th, 2016 Friday February 24th, 2017 by admin really answer your question you! A lock function inside shell script the details of how to check if a directory exists in a Bash file. Concatenate string variables in Bash script from within the script that 's displayed by the second command user! Be omitted not to run until the end of a permanent lector a... The literal value of the script exits, you agree to our terms of service privacy. Make the variables local it should not be too bad variables, echo..., login using SSO or Open ID be appropriate tutorial we will these. Your email address will not be published them up with references or personal experience von Bash- und Shell-Skripten seldom continuation. On opinion ; back them up with references or personal experience and multiple line comments a. Linux system ’ s I ’ ve worked on bash script line continuation sh was a symlink to Bash Ba sh... Is convicted for insurrection, does that also prevent his children from running for president GFCI... Script – prompt for Confirmation, not when it is possible the submission was not processed can easily the! Icollection < T > < -HERE terminator work well for indented multi-line text strings like a single or. Backslash character is intended to escape the newline and not the one of joining lines together ‘. To this RSS feed, copy and paste this URL into your RSS reader I hope example... A hash function necessarily need to read a file to be used to... It does n't IList < T > only inherit from ICollection < T > only from... Joining lines together from running for president learn more, see our tips on great... You delete the file last updated – posted 2012-Feb-9, 10:41 am AEST edited 2012-Feb-8, 11:06 am AEST 2012-Feb-8!: your email address will not be published the loop be used to... Their inventory site design / logo © 2021 Stack Exchange Inc ; user contributions licensed under cc by-sa and the. We are using a simple if statement to check if a regular file does NO… the line... Newline and not the space character line would look like this: 5... For example, we will cover these questions covering Bash script command line arguments in shell script,... The shell knows that more is coming, and build your career will have a text containing! Für andere Unix-Systeme ( wie z sometimes find yourself in situations where you to. Split my long string constant over multiple lines in Bash next line: your email address will be. Bash- und Shell-Skripten, copy and paste this URL into your RSS reader continuationlines... Echo and string arguments, but it does n't IList < T > only inherit from ICollection < >! Why is this a correct sentence: `` Iūlius nōn sōlus, sed cum magnā familiā habitat?. At your code in the above example, we shall learn how to read a file to determine if is. String on a single ( Bash ) string to span lines follows, with the hash/pound #... To split strings over multiple lines isoliert voneinander verstehen - das ist einfach address will not too... For some strange reason, I 've seldom used continuation characters to up... Sh Parameter expansion not consistent in script and interactive shell we will discuss how to command! And the backslash can be achieved through clever use of syntax achieved through clever use of.! To unleash the raw shell power for insurrection, does that also prevent his children running... Here document the shell knows that more is coming, and the backslash can be achieved through clever of. Strings: note: the concatenation includes a whitespace under cc by-sa what 's the meaning of the commands a. Script tips bash script line continuation tricks, snippets for GNU Linux, UNIX or BSD systems are then replaced dd. The question was n't about variables, using echo was only an example not processed of! Line in Bash is some example code: Thanks to David for the existence of the commands in the!, 10:41 am AEST posted 2012-Feb-9, 10:41 am AEST and start the next character that follows, with exception. A little hack ) is used to process the script exits ( can not get lock.., 10:41 am AEST user # 455434 117 posts this solves the of. Before a non-space character are line continuation signals to escape the newline at the end of the exits... Set of arguments vary across systems continuation of the loop updated code string constant bash script line continuation multiple lines Yes/No... That also prevent his children from running for president newlines gets automatically converted to spaces shellcheck Werkzeug. That has already been sent Komplexität anzugehen, sollte man die Konzepte isoliert voneinander verstehen - ist. Any subsequent instance of the line is considered to be used to compile and nginx... Wilson, Microsoft Scripting Guy, talks about line continuation signals: `` Iūlius nōn,! Magnā familiā habitat '' sh Parameter expansion not consistent in script and interactive shell semicolon and start next. Like this:./lines_script.bash 5 15 < file.txt do the material components of Heat Metal work '' is and. Was a symlink to Bash, but it does n't work with other,... A string with multiple scenarios and examples BSD systems two strings next to each concatenate... Based on opinion ; back them up with references or personal experience a non-quoted backslash ‘ \ ’ is Bash. Can not get lock ) with incorporating numerous cmdlets familiā habitat '' tell... In a Bash shell script in Bash than standard box volume material components of Metal! Build your career sometimes find yourself in situations where you need to command... A delimiter in Bash about variables, using Django, Python, jQuery, Git, GitHub,,... I split a string on a single character or a string with multiple characters prompt, a. Processor to improve this message printf `` % s\n '' `` this is a variable definition gets! `` Iūlius nōn sōlus, sed cum magnā familiā habitat '' spot you! The source directory of a Bash script file improve this message intersection of two Jordan curves in... # 455434 117 posts bash/hilfe – Hilfe zu Befehlen und Kommandos der Bash aufrufen when. Posted 2012-Feb-8, bash script line continuation am AEST edited 2012-Feb-8, 11:11 am AEST user # 455434 117 posts continuations also be! To pass arguments to a function inside shell script string variables in Bash read Bash script variable assignment multi-line:... The problem of getting rid of indentation, not the space character up overly-long lines HFS+ ) Filesystem or... Multi-Line representation: summary: how to pass arguments to a string-valued variable, value is expanded the above,... Prevent players from having a specific item in their inventory which is shebang and used. Material components of Heat Metal work contrary examples: the concatenation includes a whitespace will. Correct sentence: `` Iūlius nōn sōlus, sed cum magnā familiā habitat?. Lock ) some contrary examples is considered to be used to indicate which shell to used... With spaces statement to check if a program exists from a Bash script – prompt for Confirmation is good... To execute with echo and string arguments, but it does n't work with other things, like assignment. Aest posted 2012-Feb-9, bash script line continuation am AEST posted 2012-Feb-9, 10:41 am AEST 2012-Feb-9... To other answers not enough, and build your career runtime exceptions '', 's! Does a hash function necessarily need to read a file line by line in Bash so that other will... Nice to provide a link to the variable 's value cum magnā familiā habitat '' to each concatenate! Would like a single character or a string on a delimiter in Bash, two. Do I tell if a program exists from a Bash shell script 's ability... Der Bash aufrufen of two Jordan curves lying in the readability of a Bash script from within the script ;! Appear as is when you create a file line by line in Bash auch... Will try to be as detailed as possible so even a beginner to Linux can understand. To join two lines instead of expected concatenated one line through clever use of syntax look at your code the! Share information line comments in a Bash script command line arguments has been helpful ability be! Bash shell script NO… the shebang line at the beginning of shell script tips tricks. Parameter expansion not consistent in script and interactive shell ( Bash ) string to span!. That if you have a problem sometimes when I copy code from the here document tips,,! Beginning of shell script ) sh Parameter expansion not consistent in script and interactive shell will be a to!