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Bash Exit If Error


Another example is rm. bash scripting share|improve this question asked Sep 4 '09 at 9:51 samoz 20.7k39108167 add a comment| 6 Answers 6 active oldest votes up vote 221 down vote accepted Try this statement: On Unix and Linux systems, programs can pass a value to their parent process while terminating. You can get this # value from the first item on the command line ($0). his comment is here

How to deal with a really persuasive character? The original script did not || the for loop. –RobertL Nov 6 '15 at 8:06 I just noticed I hadn't shown the set -o errexit command in my example Using exit codes in your bash scripts While removing the echo command from our sample script worked to provide an exit code, what happens when we want to perform one action This will save more typing and promote laziness. # An error exit function function error_exit { echo "$1" 1>&2 exit 1 } # Using error_exit if cd $some_directory; then rm *

Bash Exit Script On Error

Browse other questions tagged linux bash exit exitstatus or ask your own question. Can Customs make me go back to return my electronic equipment or is it a scam? I accepted a counter offer and regret it: can I go back and contact the previous company?

You can also reset traps back to their default by using - as the command.   Signal Description INT Interrupt - This signal is sent when someone kills the script by pressing ctrl-c. In this case, command-that-fails2 will not run. Using -e gives you error checking for free. Bash Exit If Variable Not Set 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

This site is not affiliated with Linus Torvalds or The Open Group in any way. Bash Stop no outgoing connection via ipv4 Is the empty set homeomorphic to itself? That does not affect errexit at all. cp -a /var/www /var/www-tmp for file in $(find /var/www-tmp -type f -name "*.html"); do perl -pi -e 's/www.example.net/www.example.com/' $file done mv /var/www /var/www-old mv /var/www-tmp /var/www This means that if there

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. Bash Exit If Statement What could cause the throttle to stick in my Ford Ranger? Where as cmd1 || cmd2 will run cmd2 when cmd1 fails(exit value non-zero). The arithmetic expression expr2 is then evaluated repeatedly until it evaluates to zero.

Bash Stop

In this case you'd want the user to not exist and all their files to be removed. 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. Bash Exit Script On Error up vote 234 down vote favorite 49 I'm writing a script in Bash to test some code. Bash Exit If Not Root iteration done"; done ; echo "loop done" ) share|improve this answer edited Nov 7 '15 at 15:07 don_crissti 28.2k56595 answered Nov 7 '15 at 13:24 Achim 12 add a comment| Your

exit 1 would read to me as a "signal" to some other process (i.e. this content Simple test scripts that invoke /usr/bin/false followed by echo do not bail when expected. Not the answer you're looking for? What does an 'ü' mean? Bash Exit If Directory Doesn't Exist

And while wee have a variable with a numeric value: ((UID)) && echo 'You have to be root.' && exit 1. –manatwork Nov 4 '11 at 18:25 2 @janmoesen: note 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 Is there a way to make a metal sword resistant to lava? weblink Improving the error exit function There are a number of improvements that we can make to the error_exit function.

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. Bash Exit If No Arguments 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 You need to make sure that both the old and the new directories are moved to locations that are on the same partition so you can take advantage of the property

In a GNU C macro envSet(name), what does (void) "" name mean?

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 Is the following extension of finite state automata studied? I recognize it's a bit more complicated, but it seems so useful. Bash Exit If Return Code For certain scripts, it's very useful.

It's possible to write scripts which minimise these problems. 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 Can I use an HSA as investment vehicle by overcontributing temporarily? check over here If scripts do not properly use exit codes, any user of those scripts who use more advanced commands such as list constructs will get unexpected results on failures.

if [ $filename = "foo" ]; will fail if $filename contains a space. What are the holes on the sides of a computer case frame for?