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reserved word, then the shell shall immediately exit. Exit status As you recall from previous lessons, every well-written program returns an exit status when it finishes. UNIX is a registered trademark of The Open Group. The fix is to use: if [ ! -e $lockfile ]; then trap "rm -f $lockfile; exit" INT TERM EXIT touch $lockfile critical-section rm $lockfile trap - INT TERM EXIT else http://waspsoft.com/bash-script/bash-script-stop-on-error.html

Logical ERROR470Check existence of input argument in a Bash shell script436Loop through array of strings in bash script? While this is a working solution to the problem, there are more clever methods that will save us some typing. Why can a Gnome grapple a Goliath? E.g. [ -d /etc ] || echo "your system is broken" (if /etc is not a directory, echo something). –Tim Post♦ Jun 25 '12 at 10:24 Is redirecting the

Stop Bash Script If Command Fails

Or exec 2>&1 which sets stderr to be the same as stdout, and is likely to be wrong. And sort out what it is in your environment setup that makes bash misbehave - all sorts of scripts will fail unexpectedly if your shell bails on the first error. –Jonathan Previous | Contents | Top | Next © 2000-2016, William E.

Also the time where it is affected is reduced to the time between the two mvs, which should be very minimal, as the filesystem just has to change two entries in the Good way to explain fundamental theorem of arithmetic? EDIT: In order to change the behaviour such that in the execution should continue only if executing some-arbitrary-command returned file not found as part of the error, you can say: [[ Bash Script Exit On Error Meaning of "soul-sapping" spectral norm of block-wise sums of matrices Activate Hearthstone season chest cards?

Again, for readability you may want to use set -o errexit. Stop Bash Script Running 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 How to pluralize "State of the Union" without an additional noun? set +e command1 command2 set -e On a slightly related note, by default bash takes the error status of the last item in a pipeline, which may not be what you

But this script prints “a-b-True”, where some people (myself included) might have expected it to print “a-False”: set -e myfun() { printf a-; Bash Script Continue On Error This can be fixed by using: if [ "$filename" = "foo" ]; When using $@ variable, you should always quote it or any arguments containing a space will be expanded in Unexpected parent process id in output Adopt A Jet/Book Should indoor ripened tomatoes be used for sauce? Putting another “set -e” inside the definition of myfun doesn’t make any difference.

  1. share|improve this answer edited Jul 24 '13 at 13:00 answered Jul 24 '13 at 9:49 devnull 60.7k16102135 Is this more of a replacement for my "set +e and set
  2. Other ways to suppress just the announcement of the process death include (sleep 10 & pkill sleep) 2> /dev/null and { sleep 10 & pkill sleep;} 2> /dev/null which change the
  3. Does mean=mode imply a symmetric distribution?

Stop Bash Script Running

Join them; it only takes a minute: Sign up Bash ignoring error for a particular command up vote 144 down vote favorite 16 I am using following options set -o pipefail Use set -u How often have you written a script that broke because a variable wasn't set? Stop Bash Script If Command Fails You can check for files with files open by using lsof. Stop Bash Script Execution BTW Welcome to SO –victor hugo Jul 2 '09 at 15:46 set {args} is not always portable.

Only then does rm get executed; otherwise an error message is output and the program exits with a code of 1, indicating that an error has occurred. weblink Browse other questions tagged bash shell-script stderr or ask your own question. You want to be certain that something either happened correctly or that it appears as though it didn't happen at all.Say you had a script to add users. In particular you should use quotes around variables. Stop Bash Script From Terminal

It contains the current # line number. The difference between a good program and a poor one is often measured in terms of the program's robustness. Also, I want to add that when pipefail is on, it is enough for shell to think that the entire pipe has non-zero exit code when one of commands in the navigate here Aborting." fi AND and OR lists Finally, we can further simplify our script by using the AND and OR control operators.

Problem? Bash Script Exit With Error Message It's like saying if this does not work, run /bin/true and return that value instead. Why does Windows show "This device can perform faster" notification if I connect it clumsily?

The lockfile will be left there and your script won't run again until it's been deleted.

I understand > /dev/null means the error gets redirected there but I neither understand the syntax nor the meaning of the other part. current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. You can also use the slightly more readable set -o nounset. Bash Script Ignore Error Continue environment variable. $?

but I doubt that this is a concern for you. If those answers do not fully address your question, please ask a new question. Aborting." 1>&2 exit 1 fi Here we check to see if the cd command is successful. his comment is here I used to be a fan of “set -e” in shell scripts.

GTIN validation My girlfriend has mentioned disowning her 14 y/o transgender daughter Finding a file starting with '-' dash What type of sequences are escape sequences starting with "\033]" Is this Browse other questions tagged bash or ask your own question. What is ERR considered to be? I once had a Unix system administrator who wrote a script for a production system containing the following 2 lines of code: # Example of a really bad idea cd $some_directory

Rosa Parks is a [symbol?] for the civil rights movement? 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 It is also important that your scripts return a meaningful exit status when they finish. How would family relationships change if legal system uses collective punishment?

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 Also, note the inclusion of the LINENO environment variable which will help you identify the exact line within your script where the error occurred. #!/bin/bash # A slicker error handling routine trap command signal [signal ...] There are many signals you can trap (you can get a list of them by running kill -l), but for cleaning up after problems there are only particular_script From the POSIX specification regarding set -e (emphasis mine): When this option is on, if a simple command fails for any of the reasons listed in Consequences of Shell Errors

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