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exit bash script with error Ecorse, Michigan

You might write: for file in $(find /var/www -type f -name "*.html"); do perl -pi -e 's/www.example.net/www.example.com/' $file done Now if there is a problem with the script you could have asked 11 months ago viewed 1104 times active 11 months ago Related 28How can I get bash to exit on backtick failure in a similar way to pipefail?2make `find` return with The list constructs use exit codes to understand whether a command has successfully executed or not. To see how it works (I use the shorthand -e for to set errexit: $ ( set -e; false; echo still here ) $ $ ( set +e; false; echo still

Older shells expect it to be its own program though. –Evan Teitelman Jul 8 '13 at 21:24 add a comment| Your Answer draft saved draft discarded Sign up or log Fortunately bash provides you with┬áset -u, which will exit your script if you try to use an uninitialised variable. asked 5 years ago viewed 52592 times active 11 months ago Linked 195 What does set -e mean in a bash script? The answer is exit codes, exit codes are important and this article describes how to use them in your scripts and understand them in general.

Usually a well written bash script will work if you add set -e at the start and the addition works as an automated sanity check: abort the script if anything goes Using them, we can see how the $? trap : 0 echo >&2 ' ************ *** DONE *** ************ ' share|improve this answer answered Mar 5 '14 at 15:43 supercobra 2,95342738 Why the DONE message to stderr? To help explain exit codes a little better we are going to use a quick sample script.

Join them; it only takes a minute: Sign up Exit a Script On Error up vote 43 down vote favorite 7 I'm building a Shell Script that has a if function An OR list has the form command1 || command2 command2 is executed if, and only if, command1 returns a non-zero exit status. Use set -u How often have you written a script that broke because a variable wasn't set? This will also work as expected, when you source the script.

Please click the link in the confirmation email to activate your subscription. pipe 1 would be stdout itself. command; then echo "command failed"; exit 1; fi What if you have a command that returns non-zero or you are not interested in its return value? 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

An advantage is that you now have a backup before you made your changes in case you need to revert. © 2013 Company Name Exit command From Linux Shell Scripting Tutorial echo exit 113 # Will return 113 to shell. # To verify this, type "echo $?" after script terminates. # By convention, an 'exit 0' indicates success, #+ while a non-zero COMMAND_LAST # Will exit with status of last command. For more on set -e, see Greg's FAQ #105. –John1024 Nov 6 '15 at 7:55 @John1024 Thanks.

How should I interpret "English is poor" review when I used a language check service before submission? Depending on the type of syntax error, the script might not even be executed at all. Why is absolute zero unattainable? EXIT Exit - this is a pseudo-signal and is triggered when your script exits, either through reaching the end of the script, an exit command or by a command failing when

use the [] for that. This one's going down down down and out. –RobertL Nov 6 '15 at 7:57 @John1024 But I guess the evidence is still that errexit wasn't set. This stops at the first for-iteration right after the false command: ( set -e; for (( i=1; i<5; i++ )); do echo $i; false; echo "${i}. If you forget to check something, bash will do it or you.

bash shell-script share|improve this question edited Nov 6 '15 at 8:02 asked Nov 6 '15 at 7:10 the_velour_fog 2,4491122 add a comment| 4 Answers 4 active oldest votes up vote 3 On top of those reasons, exit codes exist within your scripts even if you don't define them. echo "exit status of \"true\" = $?" # 0 ! So, what's the problem with this function?

Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the We can use something similar to: if ( set -o noclobber; echo "$$" > "$lockfile") 2> /dev/null; then trap 'rm -f "$lockfile"; exit $?' INT TERM EXIT critical-section rm -f "$lockfile" chroot=$1 ... special variable in bash.

It seems like exit codes are easy for poeple to forget, but they are an incredibly important part of any script. It is also important that your scripts return a meaningful exit status when they finish. Please use the new version at LinuxCommand.org LinuxCommand Learningtheshell Writingshellscripts Script library SuperMan pages Who, What, Where, Why Tips, News And Rants Previous | Contents | Next Errors and Signals and Create a shell script called datatapebackup.sh: #!/bin/bash BAK=/data2 TAPE=/dev/st0 echo "Trying to backup ${BAK} directory to tape device ${TAPE} .." # See if $BAK exits or not else die # Set

Unfortunately it means you can't check $? How to convert a set of sequential integers into a set of unique random numbers? there are dark corners in the Bourne shell, and people use all of them.

--Chet Ramey

The exit command terminates a script, It is, though, a question of style and others can have their own opinions. –John1024 Nov 6 '15 at 7:37 1 works nicely!

share|improve this answer edited Aug 11 at 8:09 Édouard Lopez 8,87664669 answered Aug 26 '14 at 21:24 c.gutierrez 1,538910 3 I'm fairly new to unix scripting. A careful reading of the output of help set shows: -e Exit immediately if a command exits with a non-zero status. as what you've observed (set -e no responding as you're expecting) is in fact very well documented. It is very important to check the exit status of programs you call in your scripts.

Determine if a coin system is Canonical What is the most expensive item I could buy with £50? bash exit shell share|improve this question edited Nov 9 '15 at 14:39 NargothBond 4872722 asked Dec 7 '10 at 21:10 Nathan Campos 10.3k37149260 add a comment| 5 Answers 5 active oldest Appease Your Google Overlords: Draw the "G" Logo Near Earth vs Newtonian gravitational potential What sense of "hack" is involved in five hacks for using coffee filters? So what can you do about it?

This riddle could be extremely useful Does chilli get milder with cooking? In this case, the last run command is the echo command, which did execute successfully. exit / exit status

#!/bin/bash echo hello echo $? # Exit status 0 returned because command executed successfully. 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.