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exit with error in shell script El Nido, California

Aborting." 1>&2 exit 1 fi Here we check to see if the cd command is successful. The exact meaning of the returned value is frequently documented in the program's man page. trap 'err=$?; echo >&2 "Exiting on error $err"; exit $err' ERR. And what about "double-click"?

if [ $filename = "foo" ]; will fail if $filename contains a space. But what happens if the directory named in $some_directory doesn't exist? echo "exit status of \"true\" = $?" # 0 ! lskdf # Unrecognized command.

Using them, we can see how the $? Commands in test positions are allowed to fail (e.g. In particular you should use quotes around variables. You can also turn set -e off for a part of the script with set +e.

Is accuracy a binary? Script: #!/bin/bash touch /root/test 2> /dev/null if [ $? -eq 0 ] then echo "Successfully created file" exit 0 else echo "Could not create file" >&2 exit 1 fi With the New tech, old clothes Good Term For "Mild" Error (Software) How to cope with too slow Wi-Fi at hotel? Recent How to Run a Script Before an Inactivity Triggered Log Out Power Manager 4.5.4 Released How to Show an Inactivity Warning How to Trigger an Event with the Power Manager

david% foo() { for i in [email protected]; do printf "%s\n" "$i"; done }; foo bar "baz quux" bar baz quux david% foo() { for i in "[email protected]"; do printf "%s\n" "$i"; special variable in bash. david% bash /tmp/shrink-chroot.sh $chroot= david% bash -u /tmp/shrink-chroot.sh /tmp/shrink-chroot.sh: line 3: $1: unbound variable david% Use set -e Every script you write should include set -e at the top. 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

SUSECON is focused on helping you build and define your future and our our full conference pass opens all doors! 150+ Sessions featuring exceptional EXPERT technical content 100+ hours of HANDS_ON Commands whose status is tested by a conditional (such as if, && or ||) do not terminate the script (otherwise the conditional would be pointless). What are exit codes? It seems like exit codes are easy for poeple to forget, but they are an incredibly important part of any script.

Aborting" rm * If an exit is not required in case of error, then you can even do this: # Another way to do it if exiting is not desired cd function directoryExists { # was: do the cd in a sub-shell so it doesn't change our own PWD # was: if errmsg=$( cd -- "$1" 2>&1 ) ; then if [ http://tldp.org/LDP/abs/html/ In context: if jarsigner -verbose -keystore $keyst -keystore $pass $jar_file $kalias then echo $jar_file signed sucessfully else echo ERROR: Failed to sign $jar_file. Is it "eĉ ne" or "ne eĉ"?

If you would like this to fail, then you can use set -o pipefail to make it fail. It's not, if nothing goes wrong. An AND list has the form command1 && command2 command2 is executed if, and only if, command1 returns an exit status of zero. And what about "double-click"?

An advantage is that you now have a backup before you made your changes in case you need to revert. © 2013 Company Name Toggle navigation Benjamin Cane Home Archive All rights reserved. What sense of "hack" is involved in five hacks for using coffee filters? Instead shell script asks you, the author, to check individual program exit codes and branch as needed in case of an error.

Is the mass of an individual star almost constant throughout its life? In practice, this means your once short script is going to get a little longer and a little more involved. All rights reserved. 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

This may help when using test or && or ||. –mouviciel Dec 7 '10 at 21:27 4 To expand on mouviciel's comment: in shell scripts, 0 always means success, and Execution: $ ./tmp.sh Could not create file $ echo $? 1 Using exit codes on the command line Now that our script is able to tell both users and programs whether 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 Even if it's a trap! –NargothBond Nov 9 '15 at 14:06 often using the -x flag with the -e flag is enough of a trace on where your program

It can also return a value, which is available to the script's parent process.

Every command returns an exit status (sometimes referred to as a return status

david% touch "foo bar" david% find | xargs ls ls: ./foo: No such file or directory ls: bar: No such file or directory david% find -print0 | xargs -0 ls ./foo You could fix this using a backup and a trap, but you also have the problem that the site will be inconsistent during the upgrade too. EvenSt-ring C ode - g ol!f Digital Diversity "Rollbacked" or "rolled back" the edit? Is intelligence the "natural" product of evolution?