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Shell Script If Error

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Shell Script Exit Code

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Shell Script Exit On Error

systems. 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 top How to conditionally do something if bash catch error a command succeeded or failed up vote 80 down vote favorite 17 How can I do something like this in bash? if "`command` returns any error"; then echo "Returned an error" else echo "Proceed..." fi bash control-flow share|improve this question edited Oct 16 '11 at 23:57 Michael Mrozek♦ 45.6k19146183 asked Oct 16 '11 at 21:25 Shinmaru migrated from programmers.stackexchange.com Oct 16 '11 at 22:29 This question came from our site for professionals, academics, and students working within the systems bash script exit on error development life cycle who care about creating, delivering, and maintaining software responsibly. add a comment| 7 Answers 7 active oldest votes up vote 110 down vote That's exactly what bash's if statement does: if command ; then echo "Command succeeded" else echo "Command failed" fi Adding information from comments: you don't need to use the [ ... ] syntax in this case. [ is itself a command, very nearly equivalent to test. It's probably the most common command to use in an if, which can lead to the assumption that it's part of the shell's syntax. But if you want to test whether a command succeeded or not, use the command itself directly with if, as shown above. share|improve this answer edited Nov 23 '13 at 0:28 answered Oct 16 '11 at 21:50 Keith Thompson 8,32232235 3 Note that the semicolon is important. –Thorbjørn Ravn Andersen Oct 17 '11 at 7:37 9 Or you can just put then on a separate line. –l0b0 Oct 17 '11 at 9:00 11 @Joe: I think you mean if ! command ; then ... ; fi. [ is itself a command, and it's not needed in this case. –Keith Thompson Jan 13 '12 at 10:19 10 @Joe: My way also has the virtue of being correct. if [ ! command ] doesn't execute command; it treats command as a string and treats it as true

article shows how to add error checking to highlight problems you might otherwise miss. Access the shell

Linux Kernel Error Codes

on Mac via the Terminal.app Unlike more recently designed languages, shell script exit bash shell does not have an easy answer for error handling. There are no common exception handling routines or ways of

1>&2

wrapping up large blocks of script and asking for errors to fall through to a provided subroutine. Instead shell script asks you, the author, to check individual program exit codes http://unix.stackexchange.com/questions/22726/how-to-conditionally-do-something-if-a-command-succeeded-or-failed and branch as needed in case of an error. In practice, this means your once short script is going to get a little longer and a little more involved. Unix Exit Status Each program you run through a shell script returns an exit status. This numeric status value tells the calling script if the program completed successfully or if an https://www.dssw.co.uk/blog/2012-10-08-how-to-add-error-checking-to-your-shell-scripts/ error was encountered. The exit status is not visible on the command line. This makes it difficult to tell if something went wrong just by looking at the textual output of a shell script. It is possible - even common - for scripts to print nothing and yet encounter multiple errors. Let's consider this simple script: #!/bin/sh cp /Volumes/Documents/criticalfile.txt /Volumes/BackUp/. This script does one thing; it copies a single file from one volume to another using the cp program. Thankfully the cp program is chatty and will print a message if an error is encountered. That is great for us reviewing the output visually, but for the shell running our script the error will go completely unnoticed. This is a problem if our script goes on to do more work, or if we want the script to robustly deal with errors. Let's add error checking to this simple script. #!/bin/sh cp /Volumes/Documents/criticalfile.txt /Volumes/BackUp/. if [ "$?" != "0" ]; then echo "[Error] copy failed!" 1>&2 exit 1 fi We have added an if/fi block below the http://stackoverflow.com/questions/17830326/ignoring-specific-errors-on-shell-script ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.3 million programmers, just like you, helping each other. Join them; it only takes http://askubuntu.com/questions/29370/how-to-check-if-a-command-succeeded a minute: Sign up Ignoring specific errors on Shell Script up vote 13 down vote favorite 6 I have a small snippet of a shell script which has the potential to throw many errors. I have the script currently set to shell script globally stop on all errors. However i would like for this small sub-section is slightly different. Here is the snippet: recover database using backup controlfile until cancel || true; auto I'm expecting this to eventually throw a "file not found" error. However i would like to continue executing on this error. For any other error i would like the script to stop. What would be the best method of achieving this? Bash Version 3.00.16 bash shell unix share|improve this question edited Jul shell script exit 24 '13 at 13:35 asked Jul 24 '13 at 9:38 Stunt 1571212 2 Does this help? And, Welcome to SO! :) –S.R.I Jul 24 '13 at 9:42 That does help to improve my error reporting however it does not include anything for handling different errors in a different manor. I'm essentially trying to mimic the try{}catch{} from c# –Stunt Jul 24 '13 at 10:00 add a comment| 2 Answers 2 active oldest votes up vote 32 down vote accepted In order to prevent bash to ignore error for specific commands you can say: some-arbitrary-command || true This would make the script continue. For example, if you have the following script: $ cat foo set -e echo 1 some-arbitrary-command || true echo 2 Executing it would return: $ bash foo 1 z: line 3: some-arbitrary-command: command not found 2 In the absence of || true in the command line, it'd have produced: $ bash foo 1 z: line 3: some-arbitrary-command: command not found Quote from the manual: The shell does not exit if the command that fails is part of the command list immediately following a while or until keyword, part of the test in an if statement, part of any command executed in a && or || list except the command following the final && or ||, any command in a pipeline but the last, or if the command’s return status is being inverted with !. A trap on E

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 answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Ask Ubuntu Questions Tags Users Badges Unanswered Ask Question _ Ask Ubuntu is a question and answer site for Ubuntu users and developers. 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 top How to check if a command succeeded? up vote 63 down vote favorite 22 Is there any way to check if there is an error in executing a command? Example : test1=`sed -i "/:@/c connection.url=jdbc:oracle:thin:@$ip:1521:$dataBase" $search` valid $test1 function valid () { if $test -eq 1; then echo "OK" else echo "ERROR" fi } I already tried do that but it seems it isn't working. I don't how do that. command-line share|improve this question edited Mar 7 '11 at 13:41 Octavian Damiean 10.2k54260 asked Mar 7 '11 at 11:40 moata_u 72861523 5 Prefer $(foo) over backticks `foo`, because you can nest it, and it's easier to distinguish from apostrophes. –user unknown Mar 26 '11 at 18:19 add a comment| 5 Answers 5 active oldest votes up vote 100 down vote accepted The return value is stored in $?. 0 indicates success, others indicates error. some_command if [ $? -eq 0 ]; then echo OK else echo FAIL fi Like any other textual value, you can store it in a variable for future comparison: some_command retval=$? do_something $retval if [ $retval -ne 0 ]; then echo "Return code was not zero but $retval" fi For possible comparison operators, see man test. share|improve this answer edit

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