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Non Zero Return Code Executing Command


If a command fails because of an error during expansion or redirection, the exit status is greater than zero. Related Posts Bash command existence Calculating with Bash Cron best practices This entry was posted in Bash and tagged commands, conditionals, exit values, grouped commands, return values, testing by Tom Ryder. In fact you have 8 bits of information to convey back to the calling process. –Jos Apr 10 '15 at 13:31 @Jos I understand that. Applications of complex numbers to solve non-complex problems Can a 50 Hz, 220 VAC transformer work on 40 Hz, 180VAC? his comment is here

This array has one element for each of the pipeline components, that you can access individually like ${PIPESTATUS[0]}: pax> false | true ; echo ${PIPESTATUS[0]} 1 Note that this is getting Confusion in fraction notation How can I set up a password for the 'rm' command? 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 When a command terminates on a fatal signal N, bash uses the value of 128+N as the exit status.

Shell Script Exit Code

For example, you can test that an executable program or script is in your PATH by simply calling the program and checking for return code 9009. As your issue is related to Windows XP, we are not the best resource to troubleshoot this issue. COMMAND_LAST # Will exit with status of last command.

$? reads the exit status of the last command An exit status of zero indicates success.

What is the impact on the world politics if teleportation is possible? when you have specific non-zero error conditions to catch. Python has a module shlex; which should be used to "split" command strings. Exit Code Python What is the impact on the world politics if teleportation is possible?

What else can I do to get an academic position in the area? Bash Script Exit On Error SET /A ERROR_HELP_SCREEN=1 SET /A ERROR_FILE_NOT_FOUND=2 SET /A ERROR_FILE_READ_ONLY=4 SET /A ERROR_UNKNOWN=8 This gives me the flexibility to bitwise OR multiple error numbers together if I want to record numerous problems I want to enforce that condition to ensure it is properly handled (to make sure that any RC!=0 situation in real tests is handled as it should be). –GhostCat Apr 10 error_msg="ERROR : Failed to run the command \"$cmd\" with the output \"$msg\" !!!" [ $ret_cmd -eq 0 ] || doLog "$error_msg" doLog " DEBUG : cmdoutput : \"$msg\"" } #eof func

variable so you would have something like: ls -al file.ext rc=$?; if [[ $rc != 0 ]]; then exit $rc; fi You need to be careful of piped commands since the Exit Bash Shell The "$?" variable contains the most recent return code and "echo" prints it to the standard output. share|improve this answer answered Apr 10 '15 at 13:58 steeldriver 34.5k44782 add a comment| up vote 2 down vote You can create a new return code with the command bash -c Type the following command: date To view exist status of date command, enter: echo $?

Bash Script Exit On Error

A very simple way to halt on error is to use the EXIT command with the /B switch (to exit the current batch script context, and not the command prompt process). one is by command (-c), the other is by file (-f). Shell Script Exit Code For example, to determine whether a particular regular expression regex was present somewhere in a file options, we might apply grep(1) with its POSIX -q option to suppress output and just Bash Set Exit Code Symbolic manipulation of expression with undefined function What is an asymmetric wheel and why would you use it?

See here or here for a little more discussion on this problem. http://jscience.net/exit-code/unix-get-return-code-of-last-command.html Thanks. That "0" means "nothing wrong" is just a matter of convention. Is the computer cheating at Dice Poker? Exit Command In Unix Shell Script

We also pass a specific non-zero return code from the failed command to inform the caller of our script about the failure. Assign $? Example: \set ON_ERROR_STOP true share|improve this answer answered Jun 9 '09 at 18:51 Jin Kim 4081411 +1 for looking at the manpage :) –Server Horror Jun 9 '09 at weblink As your issue is related to Windows XP, we are not the best resource to troubleshoot this issue.

Contents 1 Exit Status 2 How Do I See Exit Status Of The Command? 2.1 How Do I Store Exit Status Of The Command In a Shell Variable? 2.1.1 Exit Status Exit Code 0 How do I create armor for a physically weak species? Hot Network Questions How much leverage do commerial pilots have on cruise speed?

parameter, using if to check if it's non-zero, which is not very elegant and a bit hard to read: # Bad practice grep -q regex options if (($? > 0)); then

Any link to docs please? –Swaroop C H Sep 18 '08 at 6:15 1 @SwaroopCH set -e your script will abort if any command in your script exit with error share|improve this answer edited Aug 25 at 9:56 answered Jul 23 '13 at 21:34 okigan 67611025 add a comment| up vote 6 down vote It has no special meaning, other than To execute a follow-on command after failure, we use the || operator: SomeCommand.exe || ECHO SomeCommand.exe failed with return code %ERRORLEVEL% I use this technique heavily to halt a script when Unix "echo -e" only gives you the return code of the last element in the pipe so, in the code: ls -al file.ext | sed 's/^/xx: /" will not return an error code if

Best way to change site IP address - from the end user perspective? nothing is found. If so, how could this be done? check over here ls | bogus_command # bash: bogus_command: command not found echo $? # 0 # Note that the !

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