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Bash Exit Loop On Error

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if [ $? -ne 0 ] then break fi done Hope this helps. -- Bill Old age and treachery will overcome youth and skill. With this technique, we create a file name that is both easily identifiable and unpredictable. I thought -e was infallible. –Trenton Sep 30 '15 at 3:17 add a comment| Not the answer you're looking for? The return value is the exit status of the last command in list that is executed, or false if any of the expressions is invalid. [Emphasis added] share|improve this answer edited http://waspsoft.com/bash-exit/bash-exit-for-loop-on-error.html

Thanks Kedelfor View Public Profile View LQ Blog View Review Entries View HCL Entries Find More Posts by Kedelfor 05-21-2005, 10:57 PM #2 rksprst Member Registered: Jan 2004 The question does not have to be directly related to Linux and any language is fair game. We have done that with the string "printfile". Verbs of buttons on websites What does Sauron need with mithril?

Bash Exit For Loop Early

Be atomic Sometimes you need to update a bunch of files in a directory at once, say you need to rewrite urls form one host to another on your website. The false command contains one statement: exit(1). 99.9% of Unix commands return 0 on success and non-zero on error. For our printing script, we might handle the signal problem this way: #!/bin/bash # Program to print a text file with headers and footers TEMP_FILE=/tmp/printfile.txt trap "rm $TEMP_FILE; exit" SIGHUP SIGINT If you use find and xargs together, you should use -print0 to separate filenames with a null character rather than new lines.

  1. This one's going down down down and out. –RobertL Nov 6 '15 at 7:57 @John1024 But I guess the evidence is still that errexit wasn't set.
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  3. For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration.
  4. Same thing if the curl command failed.
  5. You can use command || true, or if you have a longer section of code, you can turn off the error checking, but I recommend you use this sparingly.
  6. To start viewing messages, select the forum that you want to visit from the selection below. ** If you are logged in, most ads will not be displayed. ** Linuxforums now
  7. LinuxQuestions.org > Forums > Non-*NIX Forums > Programming Bash Script and Loop error handling User Name Remember Me?
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  9. Another example is rm.
  10. Also, as search #+ always starts again from the beginning, one can encode priorities in #+ the file names.

Join our community today! However, it is useful to know about this kind of construction when executing heavy jobs, that might not even be necessary when tests are inserted at the correct locations in a I also want to generate an error in a log file that i am creating. Bash Exit On Error Code Breaking a loop (even in normal operation) is considered bad practice.

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 preferred technique is to write them in a local directory such as ~/tmp (a tmp subdirectory in the user's home directory.) If you must write files in /tmp, you must The break command terminates the loop (breaks out of it), while continue causes a jump to the next iteration of the loop, skipping all the remaining commands What type of sequences are escape sequences starting with "\033]" My home country claims I am a dual national of another country, the country in question does not.

The return code is in $rc, not in $?, though. Bash For Loop Next Notices Welcome to LinuxQuestions.org, a friendly and active Linux Community. This is done when you don't know in advance how many times the loop will have to execute, for instance because it is dependent on user input.

The example below demonstrates Join them; it only takes a minute: Sign up How to get the exit status a loop in bash up vote 4 down vote favorite I know how to check the

Bash Exit While Loop

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. done exit $rc The real question is to decide whether the exit code of the loop should be success or failure if one iteration fails. Bash Exit For Loop Early The break built-inThe break statement is used to exit the current loop before its normal ending. Bash Exit Do Loop chroot=$1 ...

Have a look at inotify and bash! weblink I have added a for loop to pause for a few seconds then retry the curl command use false at the bottom of the for loop to define a default non-zero i=$((i+1)) done share|improve this answer edited Nov 6 '15 at 11:59 answered Nov 6 '15 at 11:42 rexkogitans 1736 add a comment| up vote 0 down vote If errexit is set My home country claims I am a dual national of another country, the country in question does not. Bash Exit On Error With Message

But is there any possibility to do it on the same shell? –Sriharsha Kalluru Dec 27 '12 at 18:52 Your example was so helpful for me to understand how It is a Unix tradition to use a directory called /tmp to place temporary files used by programs. Let's take a look at another script: #!/bin/bash # Program to print a text file with headers and footers TEMP_FILE=/tmp/printfile.txt pr $1 > $TEMP_FILE echo -n "Print file? [y/n]: " read navigate here fi echo -n "$a " done echo; echo; echo exit 0

The break command may optionally take a parameter.

You then need to use -0 with xargs. Bash Exit Status Variable 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 Video displays in Star Wars How to extrude a face parallel to another?

EXIT Exit - this is a pseudo-signal and is triggered when your script exits, either through reaching the end of the script, an exit command or by a command failing when

I accepted a counter offer and regret it: can I go back and contact the previous company? Click Here to receive this Complete Guide absolutely free. This would be only the case if the compound command is executed in a context where set -e is ignored. Bash While 1 Most importantly, it will only accept a single string containing the command to be performed when the signal is received.

Please use the new version at LinuxCommand.org LinuxCommand Learningtheshell Writingshellscripts Script library SuperMan pages Who, What, Where, Why Tips, News And Rants Previous | Contents | Next Errors and Signals and while true; do case $RANDOM in *0) exit 27 ;; esac done Or like this? Any help would be appreciated. http://waspsoft.com/bash-exit/bash-exit-at-error.html Problem?

In my scripts, I call this function clean_up. #!/bin/bash # Program to print a text file with headers and footers TEMP_FILE=/tmp/printfile.txt function clean_up { # Perform program exit housekeeping rm $TEMP_FILE Join Date Nov 2007 Posts 7 stopping on error in a bash loop I am doing a for loop in a bash script that automates compilation for a few packages. trap The trap command allows you to execute a command when a signal is received by your script. Not the answer you're looking for?

I accepted a counter offer and regret it: can I go back and contact the previous company? While it needs a file name passed on the command line, it doesn't check that it got one, and it doesn't check that the file actually exists. Use set -u How often have you written a script that broke because a variable wasn't set?