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Linux Check Process Return Code


How to tell my parents I want to marry my girlfriend Bash remembers wrong path to an executable that was moved/deleted Word for disproportionate punishment? Several answers define exit status 2 as "Misuse of bash builtins". When jumping a car battery, why is it better to connect the red/positive cable first? Detect MS Windows more hot questions question feed lang-sh about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Source

no matchgrep foo /tmp/bar.txt || echo "text not found"# grep returns 0, e.g. You can limit the search to the beginning of the line: grep '^'$pid Plus, you can do ps p $pid -o pid=, anyway. Safe way to get a few more inches under car on flat surface Dealing cards, derangements, and probability: Is the Riddler Express solution incorrect? share|improve this answer answered Jul 24 '11 at 22:54 jman 7,95142150 But not when it was put in the background.

Linux Get Exit Code Of Background Process

Please help me to get the spawned exit code to main script. For -x is exits with exit code 1. Not the answer you're looking for? ls: cannot access filenotfound.txt… 2 $ ls filenotfound.txt & ls: cannot access filenotfound.txt… echo $? 0 [2]+ Exit 2 ls filenotfound.txtSame thing happens when you fork off a process.

It accepts -x or a number as an argument. up vote 8 down vote favorite 6 I am trying to execute a script that executes an EXPECT script and a spawned process which has exit code in it. What happens if I don't specify an exit code In Linux any script run from the command line has an exit code. Bash Set Exit Code One thing I have noticed is sometimes scripts use exit codes and sometimes they don't.

The loop also echoes some messages to stdout indicating progress of the script. Bash If Exit Code Not 0 echo exit 113 # Will return 113 to shell. # To verify this, type "echo $?" after script terminates. # By convention, an 'exit 0' indicates success, #+ while a non-zero Publications Red Hat Enterprise Linux Troubleshooting Guide Identify, capture and resolve common issues faced by Red Hat Enterprise Linux administrators using best practices and advanced troubleshooting techniques What people are saying: ls | bogus_command # bash: bogus_command: command not found echo $? # 0 # Note that the !

Should we eliminate local variables if we can? Bash Script Exit On Error To check the exit status in a script, you may use the following pattern: somecommand argument1 argument2 RETVAL=$? [ $RETVAL -eq 0 ] && echo Success [ $RETVAL -ne 0 ] Thanks, Mad MAx.I made the correction.Peter August 4, 2009 at 8:50 PM Anonymous said... When interactive, wait does not work.

Bash If Exit Code Not 0

Linux Commando This blog is about the Linux Command Line Interface (CLI), with an occasional foray into GUI territory. echo The exit status of the process was $my_status share|improve this answer edited Oct 15 '09 at 5:08 answered Oct 15 '09 at 5:01 mob 80.5k10105225 6 ps -p $my_pid Linux Get Exit Code Of Background Process Sounds like a bug. –Stéphane Chazelas Feb 20 '14 at 20:06 add a comment| up vote 0 down vote I believe your assumption is correct. Shell Script Exit Code However, for other applications, there are different exit codes.

The process is collected and the exit status discarded right before the prompt is displayed (by default). –Patrick Feb 20 '14 at 17:50 I just tried it on bash this contact form Value for exit status 4 Detecting meaning of system() function's return value in Linux 5 Java processbuilder exitvalues 2 Confirm existance of executable (script, bat, cmd, exe) via a ruby file Execution: $ ./tmp.sh Could not create file $ echo $? 1 Using exit codes on the command line Now that our script is able to tell both users and programs whether share|improve this answer edited Jul 9 '09 at 5:48 answered Jul 9 '09 at 5:43 Dean Povey 6,40212546 add a comment| up vote 3 down vote Here is the real, long-standing Linux Return Code 1

Klist also exits 1 when it fails to find a ticket, although this isn't really any more of a failure than when grep doesn't find a pattern, or when you ls Is it a security vulnerability if the addresses of university students are exposed? It just returns the exit code and $? http://blackplanetsupport.com/exit-code/bash-check-return-code-script.html This becomes especially true if the script is used with automation tools like SaltStack or monitoring tools like Nagios, these programs will execute scripts and check the status code to determine

Can this number be written in (3^x) - 1 format? Exit Code 0 Custom ColorFunction for GeoGraphics plot with ReliefMap How should I respond to absurd observations from customers during software product demos? Browse other questions tagged linux bash shell unix expect or ask your own question.

done # wait for each background echo to complete for i in `eval echo {1..$count}` do wait ${elist[$i]} echo -n $?

Join them; it only takes a minute: Sign up Are there any standard exit status codes in Linux? special variable to print the exit code of the script. From the OpenBSD man page: According to style(9), it is not good practice to call exit(3) with arbi- trary values to indicate a failure condition when ending a program. Exit Bash Shell doSomething & local pid=$!

It can be done by kill -0 built-in (universal) or checking the existence of /proc/ directory (Linux specific) or using the jobs built-in (bash specific. Next, if command makes decision based upon exit status stored in OUT variable. Anyway…The reason you get an exit code of "0" on that last one is that ssh was successful in connecting to localhost and executing your command. Check This Out Tian would have to be pretty quick to see your links and paste them in. –Nathan Fellman Jul 9 '09 at 5:37 33 +1 - This is more useful than

does not change the execution of the pipe. # Only the exit status changes. # =========================================================== # # Thanks, Stéphane Chazelas and Kristopher Newsome.

Reply Link Poonam August 20, 2008, 8:22 amI tried to find out, but did not find anything. share|improve this answer answered May 2 '13 at 4:01 errant.info 20913 add a comment| up vote 0 down vote With this method, your script doesnt have to wait for the background linux bash shell unix expect share|improve this question edited May 12 '14 at 16:24 Jonathan Leffler 453k62523839 asked May 12 '14 at 16:18 ANR 98118 Try putting expect part Why is this important?

July 31, 2012 at 11:59 AM Post a Comment Newer Post Older Post Home Subscribe to: Post Comments (Atom) Merry Christmas Merry Christmas Followers Subscribe in a reader Enter your email Taxiing with one engine: Is engine #1 always used or do they switch? You might want to redirect the output of your ps command to /dev/null or it'll go to the screen at every iteration. The next example uses tail to follow output. $ echo '#!/bin/bash' > tmp.sh $ echo 'sleep 30; exit 5' >> tmp.sh $ chmod +x tmp.sh $ ./tmp.sh & [1] 7454 $

I'm always getting zero as success. asked 5 years ago viewed 1514 times active 5 years ago Related 17How is install -c different from cp26Which command in the Linux/UNIX sh shell returns my current directory?0How to use