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Remove advertisements Sponsored Links EagleFlyFree View Public Profile Find all posts by EagleFlyFree « Previous Thread | Next Thread » Thread Tools Show Printable Version Email this Page Subscribe to rollback() { del_from_passwd $user if [ -e /home/$user ]; then rm -rf /home/$user fi exit } trap rollback INT TERM EXIT add_to_passwd $user cp -a /etc/skel /home/$user chown $user /home/$user -R Think of variable scoping in C; variables live and die inside the block where they're declared. Edit: I've looked it up and it is POSIX: pubs.opengroup.org/onlinepubs/009695399/utilities/set.html –Taywee Dec 28 '15 at 21:36 add a comment| up vote 13 down vote May be you could use: $ http://gatoisland.com/bash-script/bash-script-set-error.php

Exiting\n" >&2; exit 2; } echo "got to here" This doesnt work and never gets to echo even if null is successful > ${OUTFILE} || { print "ERROR: cannot null output What are the holes on the sides of a computer case frame for? share|improve this answer answered Oct 23 '11 at 20:14 bonkydog 1,2781210 thanks, bonkydog. –PJx Oct 23 '11 at 20:40 Now I'm finding out another unpleasant effect. Browse other questions tagged bash or ask your own question.

Bash Script Die If Command Fails

more hot questions question feed lang-sh about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Should indoor ripened tomatoes be used for sauce? more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Touch isn't suitable as i need to null them.

Programming in a shell means using lots of little commands (some built-in commands, some tiny programs) that do one thing well and connecting them with file redirection, exit code logic and Do you think it is ok to call a small function (let's call it "did_it_work"), to check the error code and break if it's not. #!/bin/bash function did_it_work { code=$1 if Also i notied the ; at the end before } is vitally important otherwise the next command doesn't work. Exit Bash Script Without Exiting Shell asked 6 years ago viewed 93062 times active 1 month ago Linked 115 Stop on first error 3 How to execute a bash script line by line? 8 Jenkins succeed when

Natural construction When was this language released? Bash Script Exit With Error Message Your example would look like: mkdir -p some/path || die "mkdir failed" cd some/path || die "cd failed" run_some_command || die "some_command failed" Or you can align the dies further on UNIX is a registered trademark of The Open Group. asked 4 years ago viewed 15433 times active 2 years ago Linked 1 Shell equivalent of Perl's die 4 How to define a “die” shell function?

Best in same or separate script?1BASH script best practice8Bash program not executed if redirection would fail0What is the best practice between using ${var} or $var? Exit Bash Script From Function Presumably the same applies in the rest of the shells.

Last edited by EagleFlyFree; 04-23-2009 at 02:14 PM.. Remove advertisements Sponsored Links EagleFlyFree View Public Profile Find all The disadvantage of this technique is that you need to use twice as much disk space and that any process that keeps files open for a long time will still have How to increase the population growth of the human race How does Gandalf get informed of Bilbo's 111st birthday party?

  • bash programming bash linux bioinfornatics 30 June 201321 July 2013 2 comments Daniel Beaulieu says: 9 August 2013 at 20:46 Daniel Beaulieu Thanks for the blog.Much thanks again.
  • TERM Terminate - this signal is sent when someone sends the TERM signal using the kill command.
  • It may seem weird if you're used to languages where everything is done using functions or methods, but you get used to it.
  • Do you think this is a good idea or is there some other best practice to do this? /Thanks shell bash error-handling share|improve this question edited Apr 3 '11 at 20:09
  • Security already checked > ${OUTFILE} || print "ERROR: blah blah \n" >&2 ; exit 2 #doesnt work > ${OUTFILE} || (print "ERROR: blah blah \n" >&2 ; exit 2 ) #doesn't

Bash Script Exit With Error Message

The problem Most of people think to know bash but finally they do not know it well. Exiting..." >&2 exit 1 } trap 'abort' 0 set -e # Add your script below.... # If an error occurs, the abort() function will be called. #---------------------------------------------------------- # ===> Your script Bash Script Die If Command Fails Why does Windows show "This device can perform faster" notification if I connect it clumsily? Bash Script Exit On First Error add a comment| 1 Answer 1 active oldest votes up vote 237 down vote accepted Maybe you want set -e: http://www.davidpashley.com/articles/writing-robust-shell-scripts.html#id2382181 share|improve this answer answered Aug 13 '10 at 6:50 Alok

Join them; it only takes a minute: Sign up Shell scripting: die on any error up vote 25 down vote favorite 8 Suppose a shell script (/bin/sh or /bin/bash) contained several his comment is here Is so easy to run a command in bash … How to handle errors? Problem with using pause and onslide in one frame Force Microsoft Word to NEVER auto-capitalize the name of my company Why don't most major game engines use gifs for animated textures? Seems i was almost there but didn't use the correct { } Could you explain the difference between { } and ( ) in the command grouping? Exit Bash Shell Script

What does the "Phi" sign stand for in musical notation? For example, false | true will be considered to have succeeded. Obviously, one can use if blocks and/or callbacks, but is there a cleaner, more concise way? this contact form That is command.

Browse other questions tagged bash shell scripting or ask your own question. Bash Script Exit While Loop rm -rf $chroot/usr/share/doc If you ran the script above and accidentally forgot to give a parameter, you would have just deleted all of your system documentation rather than making a smaller With csh/tcsh, you have to launch your script with #!/bin/csh -e share|improve this answer edited Dec 16 '08 at 3:59 Jonathan Leffler 437k61507821 answered Dec 15 '08 at 15:43 mat 7,59622941

run_some_command did_it_work $?

You can use command || true, or if you have a longer section of code, you can turn off the error checking, but I recommend you use this sparingly. Fortunately bash provides a way to run a command or function when it receives a unix signal using the trap command. When was this language released? Bash Script Exit If No Arguments Natural construction Which requires more energy: walking 1 km or cycling 1 km at the same speed?

add_to_passwd $user cp -a /etc/skel /home/$user chown $user /home/$user -R There could be problems if you ran out of diskspace or someone killed the process. You might use a semicolon or newline instead of &&, since you want to exit whether or not echo succeeds (though I'm not sure what would make it fail). Do COB LEDs usually need electrically insulating from the heatsink? navigate here If you ask rm to delete a non-existent file, it will complain and your script will terminate. (You are using -e, right?) You can fix this by using -f, which will silently

Meaning of Guns and ghee Integral using residue theorem complex analysis Video displays in Star Wars no outgoing connection via ipv4 So sayeth the Shepherd more hot questions question feed lang-sh Code: OUTFILE=/tmp/out # Null outfiles. Force Microsoft Word to NEVER auto-capitalize the name of my company How to increase the population growth of the human race How to pluralize "State of the Union" without an additional For example, when you create a directory, if the parent directory doesn't exist, mkdir will return an error.

Forum Operations by The UNIX and Linux Forums What could cause the throttle to stick in my Ford Ranger? Password Protected Wifi, page without HTTPS - why the data is send in clear text? While the echo command is being executed, the interpreter doesn't wait for it to finish, but simultaneously executes the code below it!

A name for a well-informed person who is not believed? This of course doesn't give you the flexibility of a did_it_work() function, but it is an easy way to make sure your bash script stops on an error without adding lots What to tell to a rejected candidate? After all that is the job to a command line interpreter!

Right now, I'm achieving this using commands: echo "some msg" && exit 1 bash shell share|improve this question edited Oct 23 '11 at 20:45 Eddy Freddy 1,7611817 asked Oct 23 '11 Make stronger bash functions With the same code you can does something close to contract programming. … foo(){ [[ $# -eq 2 ]] || die 'foo function need two parameters: first So what can you do about it? Code: {aVariable="hello"; }; echo $aVariable this prints "hello" because the variable was assigned in the same shell as the next statement.

Its certainly giving me a better understanding of the shell rather than just trying things until they work Remove advertisements Sponsored Links lavascript View Public Profile Find all posts by lavascript Least Common Multiple Integral using residue theorem complex analysis What type of sequences are escape sequences starting with "\033]" How to extrude a face parallel to another? backup done! See below for an example: #!/bin/bash cd some_dir ./configure --some-flags make make install So in this case if the script can't change to the indicated directory then it would certainly not

Be atomic Sometimes you need to update a bunch of files in a directory at once, say you need to rewrite urls form one host to another on your website. exit 0 Save and close the file. Related 2882Can a Bash script tell which directory it is stored in?669How do I iterate over a range of numbers defined by variables in Bash?975Check if a program exists from a

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