Bash Continue If Error
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Bash Stop If Error
Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only bash check if error takes a minute: Sign up Execute a shell command from a shell script without stopping if error occurs up vote 20 down vote favorite 5 In a sort of try/catch form I want to execute a bash that doesn't stop if an error occurs. The specific bash is: #!/bin/sh invoke-rc.d tomcat stop rm -fr /var/webapps/ cp -R $WEBAPP /var/webapps/ invoke-rc.d bash check if error occurred tomcat start I want to exec "invoke-rc.d tomcat stop" and even if Tomcat is not running, continue to execute the other bash commands. linux bash error-handling share|improve this question edited Jul 2 '09 at 16:51 Jonathan Leffler 437k61507821 asked Jul 2 '09 at 15:31 JorgeO 67721022 5 Isn't that bash's default behavior? I could have sworn it was (you need to take explicit action to terminate a script if some command fails...) –Alex Martelli Jul 2 '09 at 15:35 If you execute this script and tomcat is not running the script will stop execution since the first command return error. I want the script to continue. –JorgeO Jul 2 '09 at 15:38 @Alex: it is default but there is probablt something that overrides the default setting. –Milan Babuškov Jul 2 '09 at 16:23 3 I'm with Alex - bash is misbehaving, or has been configured to (mis)behave by exiting on an error. Use: 'set +e' to counteract the effect of 'set -e' (which means terminate on error). And sort out what it is in
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Bash Script If Error
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it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top How can I continue a loop in http://stackoverflow.com/questions/1075083/execute-a-shell-command-from-a-shell-script-without-stopping-if-error-occurs bash after an application returned an error? up vote 1 down vote favorite I save images with: #!/bin/bash for i in {1..30000} do wget "http://services.runescape.com/m=itemdb_rs/3809_obj_sprite.gif?id="$i done Is there a way to speed up the process? Sometimes a URL does not exist and I get: connected. HTTP request sent, awaiting response... 404 Not found 2012-08-04 18:09:36 ERROR 404: Not found. How can I continue after this error? bash wget share|improve this question edited Aug 4 '12 http://superuser.com/questions/457571/how-can-i-continue-a-loop-in-bash-after-an-application-returned-an-error at 16:25 Oliver Salzburg♦ 56k35185245 asked Aug 4 '12 at 16:17 Szymon Toda 4291922 If you have an additional question about how to download out only certain object, please ask an additional question. Mixing two subjects in one question just over-complicates the matter :) –Oliver Salzburg♦ Aug 4 '12 at 16:26 @OliverSalzburg - Your comment is spot on. But you chose to edit the title to reflect the question you answered. Neglecting to notice that there where two answers answering his other question. –Nifle Aug 4 '12 at 16:37 @Nifle: Feel free to read the history of the question and change it if you feel that I've missed the point with my edit. Also, please note that I edited and commented on the question before I wrote my answer. –Oliver Salzburg♦ Aug 4 '12 at 16:39 add a comment| 2 Answers 2 active oldest votes up vote 7 down vote accepted Try wget "http://s.../m=itemdb_rs/3809_obj_sprite.gif?id="$i || true This way, if wget fails, the result of that line is still zero and your script continues. To learn how to properly handle errors in a bash script, check out the following resources: Error handling in BASH Bash: Error handling share|improve this answer answered Aug 4 '12 at 16:30 Oliver Salzburg♦ 56k35185245 +1 This is a good suggestion! –
Scripting Unix shell scripting - KSH, CSH, SH, BASH, PERL, PHP, SED, AWK and shell scripts and shell scripting languages here. Search Forums Show Threads Show Posts Tag Search Advanced Search Unanswered Threads Find All Thanked Posts Go to Page... http://www.unix.com/shell-programming-and-scripting/241905-how-ignore-error-command-bash-script.html learn linux and unix commands - unix shell scripting How to ignore error in command in bash script? Shell Programming and Scripting Thread Tools Search this Thread Display Modes #1 12-10-2013 http://serverfault.com/questions/289094/prevent-xargs-from-quitting-on-error postcd Banned Join Date: Oct 2013 Last Activity: 11 August 2016, 12:58 PM EDT Posts: 87 Thanks: 14 Thanked 2 Times in 2 Posts How to ignore error in command in bash script? Hello, i have bash script where if error im cycling some command for different lines in external file. example: Code: while read domain;do nslookupout=$(nslookup -type=ns $domain) || true another commands done < filenamewithdomains i added: || true after the command in belief it will just skip failures. But i got: nslookup: '.somedomain.com' is not a legal name (empty label) and it breaken running the script.. please how to achieve so this error is skipped and continuing to the next entry? i know i can fix my domain bash if error list so it dont contains inproper values, but i prefer skipping invalid entries. if anyone know how to remove lines in a file containing two dots at one line by sed, please kindly share. Remove advertisements Sponsored Links postcd View Public Profile Visit postcd's homepage! Find all posts by postcd #2 12-10-2013 Akshay Hegde Forum Advisor Join Date: Nov 2012 Last Activity: 28 September 2016, 2:06 AM EDT Posts: 1,783 Thanks: 97 Thanked 620 Times in 553 Posts You can do something like this Code: your command 2>&1 >/dev/null Remove advertisements Sponsored Links Akshay Hegde View Public Profile Find all posts by Akshay Hegde #3 12-10-2013 hergp Problem Eliminator Join Date: Jan 2010 Last Activity: 29 September 2016, 3:33 PM EDT Location: Vienna, Austria Posts: 841 Thanks: 26 Thanked 190 Times in 169 Posts I don't see, why your code should not work. The || true even takes care of the situation when the shell's -e option is in effect (assuming another command is not failing while -e is in effect). However, all entries in the filenamewithdomains should not start with a dot. hergp View Public Profile Visit hergp's homepage! Find all posts by hergp #4 12-10-2013 wisecracker Registered User Join Date: Jan 2013 Last Activity: 29 September 2016, 12:54 PM EDT Location: Loughborough Posts: 1,069 Thanks: 295 Thank
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 Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system and network administrators. 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 prevent xargs from quitting on error up vote 13 down vote favorite 4 According to the man page, xargs will quit if one of the execution lines exits with an error of 255: If any invocation of the command exits with a status of 255, xargs will stop immediately without reading any further input. An error message is issued on stderr when this happens. How can I get xargs to not do this? I have a 1500 or so line batch job that I want to run, 50 lines at a time. I was finding that it was always dying at a certain line, and not completing the job. Not good! An even better question, the question describing what I am trying to do, is: How can I run a 1500 line batch script, 50 lines at a time, so that it does not quit the job in the middle, and so that the output is captured to a log file of some kind? bash command-line-interface batch-processing xargs share|improve this question asked Jul 11 '11 at 15:56 JDS 806922 add a comment| 6 Answers 6 active oldest votes up vote 2 down vote accepted You could wrap the perl script with another simple bash script: #!/bin/bash real-command "$@" || exit 0 This will call real-command passing it all the parameters that you pass to this fake-command and it will always return a 0 exit code (that means it is always successful) and xargs will never stop with this. share|improve this answer answered Jul 18 '11 at 8:04 user842313 64134 add a comment| up vote 7 down vote Similar to larsks answer but more explicit: xargs sh -c "somecommand || true" share|improve this answer answered Jan 22 '14 at 0:01 Filippo Vitale 17115 add a comment| up vote 6 down vote You could write your xargs invocation to mask the return codes of your command lines. With something like the following,xargs will never see exit codes return by somecommand: xargs sh -c "somecommand || :" share|improve this answer answered Jul 11 '11 at 16:08 larsks 30k264126 I've come up with a good solution: make sure t