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Bash Script Continue After Error


I want to make sure a partition is unmounted if mounted: [[ `mount | grep /dev/sda1` ]] && umount /dev/sda1 share|improve this answer edited Sep 16 '12 at 11:00 Frédéric Hamidi What are the holes on the sides of a computer case frame for? example: Code: while read domain;do nslookupout=$(nslookup -type=ns $domain) || true another commands done < filenamewithdomains i added: || true after the command in belief it will just skip failures. I edited my post to include a reference to the question. –quartzinquartz Dec 27 '15 at 21:00 add a comment| up vote -2 down vote You can do this: if ($( Check This Out

trap - ERR # Now a control-C will still cause cleanup, but # a nonzero exit code won't: ps aux | grep blahblahblah Or, especially if you're using "set -e", you I have a bash script that calls a database client to drop some indexes, import a lot of data, and then restore the indexes. Make sure your child script exits as you expect it to. –John WH Smith Feb 25 '15 at 18:54 Yes, you were right. Fortunately bash provides you with set -u, which will exit your script if you try to use an uninitialised variable.

Bash Script Ignore Error Continue

However, on testing it's syntax errors. There are several things you can do to prevent errors in these situations. This is one of the biggest reasons why true and false were made, other than making Makefiles behave as expected in a variety of build environments.

Why are some programming languages Turing complete but lack some abilities of other languages? And I could look it up, but your is just clearer, because logic. –g33kz0r May 19 '15 at 15:09 add a comment| up vote 18 down vote If you have cleanup The lockfile will be left there and your script won't run again until it's been deleted. Bash Script Error Output How's the CMD trip bonuses from extra legs work?

share|improve this answer edited Mar 4 '10 at 3:35 answered Jul 2 '09 at 15:40 Tim Post♦ 25k1281146 I removed the paths of your code and the root user Bash Script Continue After Reboot When taking passengers, what should I do to prepare them? 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. Can Customs make me go back to return my electronic equipment or is it a scam?

dosomething1 if [[ $? -ne 0 ]]; then exit 1 fi dosomething2 if [[ $? -ne 0 ]]; then exit 1 fi linux bash unix shell share|improve this question edited Sep Bash Script Error Log Mixing two subjects in one question just over-complicates the matter :) –Oliver Salzburg♦ Aug 4 '12 at 16:26 @OliverSalzburg - Your comment is spot on. up vote 1 down vote favorite I save images with: #!/bin/bash for i in {1..30000} do wget "http://services.runescape.com/m=itemdb_rs/3809_obj_sprite.gif?id="$i done Is there a way to speed up the process? I have 100 of script executing and I don't want to check return code of the script.

  1. The exit statement was buried inside a code block (between { and }) which was piped to tee for logging: { #...
  2. Why are some programming languages Turing complete but lack some abilities of other languages?
  3. 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
  4. Even though I loved my work my aged brain has forgotten everything.
  5. And, as discussed above, || short-circuits so the RHS is only executed if the LHS fails (returns non-zero).
  6. Anyway, thank you for quoting the documentation, I put my expression to if clause and solved the problem. –Marboni Jun 24 '15 at 18:19 add a comment| Your Answer draft
  7. Unix & Linux Stack Exchange works best with JavaScript enabled current community chat Unix & Linux Unix & Linux Meta your communities Sign up or log in to customize your list.
  8. For example, suppose you have this script #!/bin/bash set -e ./configure > configure.log make ...
  9. How to map and sum a list fast?
  10. and now it does not work.

Bash Script Continue After Reboot

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 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 Bash Script Ignore Error Continue I tried printing $? Bash Script Error Command Not Found Why doesn't the exit code from the child make it into the parent?

However, if you do: set +e || { code to cope with a brain dead shell } Its just fine for anything worth its salt in POSIX conformity. his comment is here Tomorrow you make a seemingly trivial change: #!/bin/bash set -e ./configure | tee configure.log make ... share|improve this answer edited Jul 24 '13 at 13:00 answered Jul 24 '13 at 9:49 devnull 60.7k16102135 Is this more of a replacement for my "set +e and set variable is rarely needed. Bash Script Error Check

From man set "if a simple command (see SHELL GRAMMAR above) exits with a non-zero status. share|improve this answer edited May 7 '09 at 20:58 answered May 7 '09 at 20:52 fholo 366211 add a comment| up vote 11 down vote Run it with -e or set But if you want to test whether a command succeeded or not, use the command itself directly with if, as shown above. http://gatoisland.com/bash-script/bash-script-ignore-error-continue.php I personally start almost all shell scripts with "set -e".

How to indicate you are going straight? Bash Script Error Message How to handle spending money for extended trip to Europe? How's the CMD trip bonuses from extra legs work?

But for a particular script I want to ignore the error.

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 which works as expected: an error in configure aborts the execution. Fortunately bash provides a way to run a command or function when it receives a unix signal using the trap command. Bash Script Error Exit is required is when it needs to be checked against multiple values: command case $?

It's false if the command's output is empty and true otherwise, regardless of the command's exit status. –Gilles Sep 22 '12 at 22:42 add a comment| Your Answer draft saved However, all entries in the filenamewithdomains should not start with a dot. American English: are [ə] and [ʌ] different phonemes? navigate here Is there a way to make a metal sword resistant to lava?

This tells bash that it should exit the script if any statement returns a non-true return value. Search Forums Show Threads Show Posts Tag Search Advanced Search Unanswered Threads Find All Thanked Posts Go to Page... learn linux and unix commands - unix shell scripting How Modern soldiers carry axes instead of combat knives. So it could be #!/bin/sh some command if [ $? == 0 ] echo '' else echo '' fi share|improve this answer edited Nov

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). command ; then ... ; fi. [ is itself a command, and it's not needed in this case. –Keith Thompson Jan 13 '12 at 10:19 8 @Joe: My way also It looks like the exit code from the child script does not get picked up by the parent script. –FrustratedWithFormsDesigner Feb 25 '15 at 18:26 @FrustratedWithFormsDesigner There must be Here's my test: #!/bin/bash set -u set -e foo() { rm MissingFile.txt } echo 1 [[ $(foo 2>&1) =~ "No such file" ]] echo 2 This produces a '(' expected error.

This can be fixed by using: if [ "$filename" = "foo" ]; When using [email protected] variable, you should always quote it or any arguments containing a space will be expanded in Post some runnable code that would let us reproduce the problem. –Gilles Feb 25 '15 at 23:39 | show 2 more comments 3 Answers 3 active oldest votes up vote 1 bash ./child_1.sh echo "continuing to next step..." bash ./child_2.sh bash ./child_3.sh #... Intuition behind Harmonic Analysis in Analytic Number Theory Why don't most major game engines use gifs for animated textures?

UNIX is a registered trademark of The Open Group. My home country claims I am a dual national of another country, the country in question does not. 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 In this case you'd want the user to not exist and all their files to be removed.

Using Map to convert Feet + Inches to Inches in a List of Lists Why write an entire bash script in functions? Is this safe to display MySQL query error in webpage if something went wrong? Meaning of "soul-sapping" Password Protected Wifi, page without HTTPS - why the data is send in clear text? I shudder remembering a monster Ultrix installation script written with just these conditional constructions I once tried to decipher... –vonbrand Dec 27 '15 at 22:15 add a comment| up vote 31

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 Activate Hearthstone season chest cards? The && operator acts like a short-circuit AND operator, and a zero exit code is pretty much like a true boolean value. I edited this post a few times and failed to notice that I left the paths in tact :) I must be slightly brain dead today. –Tim Post♦ Jul 2 '09

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