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Linux Get Return Code


Reply Link saravanakumar June 12, 2011, 2:44 pmVery useful…thanks a lot…its makes me to understand about "$?". Read man page to find out meaning of return status 1 and 8. This site is not affiliated with Linus Torvalds or The Open Group in any way. while ps -p$foo_pid do ping -c 1 localhost done wait $foo_pid if [[ $? == 0 ]] then echo "foo success" fi Is it safe to assume that $? check over here

Reply Link Security: Are you a robot or human?Please enable JavaScript to submit this form.Cancel replyLeave a Comment Name * Email * Comment You can use these HTML tags and attributes: I left out the #!/bin/bash.Thanks,Love your work.Rob Reply Link moheb April 5, 2008, 3:55 pmthank youit seems very useful for my search great job Reply Link powerpleb June 1, 2008, 10:27 share|improve this answer edited Nov 1 '15 at 12:21 mit 7964918 answered Sep 12 '14 at 4:50 Rob 28122 1 Very clever. But ssh worked.

Linux Exit Code List

Reply Link nixCraft August 5, 2008, 1:00 pmExit status is depend upon program or command. 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 Memorable ordinals How do you define sequences that converge to infinity?

  1. echo $result In bash script $?
  2. ls: cannot access filenotfound.txt… 2 $ ls filenotfound.txt & ls: cannot access filenotfound.txt… echo $? 0 [2]+ Exit 2 ls filenotfound.txtSame thing happens when you fork off a process.
  3. Anagram puzzle whose solution is guaranteed to make you laugh Hacker used picture upload to get PHP code into my site Ultimate Australian Canal Should we eliminate local variables if we
  4. while : bar & [ "$pid" != "$!" ]; do :;done wait "$pid"; echo "$?"' which will (eventually) give you 0 instead of 12.
  5. How do you express any radical root of a number?
  6. Thanks for sharing, and thanks for the above comment.
  7. You can store result of exit status in variable.
  8. echo "exit status of \"true\" = $?" # 0 !
  9. This would execute the command for every found file.

If grep command finds user name in /etc/passwd command output it would return exit status of zero. Negating a condition using !

true # The "true" builtin. If you want to execute a command with all found files as arguments use a + at teh end like this: find -name '*.wsdl' -exec emacs {} + This would open Write A Shell Script To Calculate Sum Multiplication Of Three Variables Using Expr Keyword Browse other questions tagged bash shell-script background-process exit or ask your own question.

still relevant directly to this one, so leaving it, but sorry for the dupe. Linux Return Code 1 Hacker used picture upload to get PHP code into my site What do you call this alternating melodic pattern? You can test this with a simple script: #!/bin/bash sh -c 'sleep 1; exit 22' & sleep 5 echo "FG: $?" wait %1 echo "BG: $?" Which will output: FG: 0 Your answer is absolutely correct for the above question. –mcmlxxxiii Aug 12 '16 at 21:55 add a comment| up vote 30 down vote There is no special bash variable for that.

I can start about 34 background processes before it starts to loose track. Linux Exit Code 127 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 ] The above command will execute the ./tmp.sh script, and if the exit code is 0 the command echo "bam" will be executed. Ultimate Australian Canal Detect ASCII-art windows made of M and S characters Are airlines obliged to notify ticket cancellations due to no-shows?

Linux Return Code 1

POSIX requires that a shell remembers the exit status of at least 25 jobs after they're gone, but bash remembers a lot more than that. lskdf # Unrecognized command. Linux Exit Code List ls | bogus_command # bash: bogus_command: command not found echo $? # 127 ! Bash If Exit Code Not 0 Join them; it only takes a minute: Sign up How to output return code in shell?

always expands to the status of the most recently executed foreground command or pipeline. check my blog That helped. How to make use of Devel debugging functions on large or complex objects more hot questions question feed default about us tour help blog chat data legal privacy policy work here Browse other questions tagged bash or ask your own question. Linux Get Exit Code Of Background Process

What's the point of repeating an email address in "The Envelope" and the "The Header"? a process Remap Caps Lock key for virtual console windows Remap useless Caps Lock key in X ► February (5) ► January (1) ► 2007 (21) ► December (3) ► November I know only 0 for successful. this content You could also use #!/bin/sh result = $(java TestReturn) echo $result Leave comments, ask questions, or suggest improvementsFeel free to leave comments or suggest improvements.


The equivalent of a bare exit is exit $? or even just omitting the exit.

#!/bin/bash COMMAND_1 . . . What Does A Down Arrow Represent In A Flowchart? Next, if command makes decision based upon exit status stored in OUT variable. Bash script wait for processes and get return code edit 1 Inspired by @Stephane's comments and answers I have expanded his script.

Please note that these parameters or variables may only be referenced assignment to them is not allowed.

All UNIX and Linux command has a several parameters or variables that can be use to find out the exit status of command. Not the answer you're looking for? Doing anything on the previous line defeats my purpose, to retroactively decide I want to do something with the last returned value. (Checkout a branch I found via git br | How To Check Exit Status In Saudi Arabia Buy on Amazon Sponsored by Become a Sponsor Copyright © Benjamin Cane 2014 - Contact the Author UbuntuCommunityAsk!DeveloperDesignDiscourseHardwareInsightsJujuShopMore ›AppsHelpForumLaunchpadMAASCanonical current community chat Ask Ubuntu Ask Ubuntu Meta your communities Sign up

COMMAND_LAST # Will exit with status of last command. Sunfounder DS18B20 disable light 3-prong grounded female plug for 12-gauge wire with an 18-gauge ground wire Should we kill the features that users are not using frequently, to improve performance? fi } 3< <(foo > logfile 2>&1; echo "$?") share|improve this answer edited Sep 28 '15 at 20:11 answered Feb 20 '14 at 14:07 Stéphane Chazelas 190k32316551 add a comment| up have a peek at these guys Linux Commando This blog is about the Linux Command Line Interface (CLI), with an occasional foray into GUI territory.

Trick grep not to report itself in a process searc... if [ $OUT -eq 0 ];then echo "User account found!" else echo "User account does not exists in /etc/passwd file!" fiSave and execute the script as follows: $ chmod +x script.sh

Thank you!! asked 2 years ago viewed 12882 times active 1 year ago Linked 8 Bash script wait for processes and get return code Related 1Using sshpass, return code (exit status) differs for Privacy - Terms of Service - Questions or Comments current community chat Unix & Linux Unix & Linux Meta your communities Sign up or log in to customize your list. Should we eliminate local variables if we can?

Bash One Liner: $ ./tmp.sh && echo "bam" || (sudo ./tmp.sh && echo "bam" || echo "fail") Could not create file Successfully created file bam The above grouping of commands use If scripts do not properly use exit codes, any user of those scripts who use more advanced commands such as list constructs will get unexpected results on failures. When running as a script, bash does not automatically collect completed background jobs. On POSIX systems the standard convention is for the program to pass 0 for successful executions and 1 or higher for failed executions.

Using exit codes in your bash scripts While removing the echo command from our sample script worked to provide an exit code, what happens when we want to perform one action If you look at exit codes in the context of scripts written to be used for the command line the answer is very simple. Reply Link Poonam August 20, 2008, 8:22 amI tried to find out, but did not find anything. Reply Link Erik February 15, 2016, 2:40 pm$ ssh localhost “./cyberciti; echo $?” Did you notice it was all in quotes?