Print Error Code Bash
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The exit command terminates a script, just as in a C program. It can also return aBash If Exit Code
value, which is available to the script's parent process.
Every command returns bash script exit on error an exit status (sometimes referred to as a return status or exit code).Bash Return Value From Function
> A successful command returns a 0, while an unsuccessful one returns a non-zero value that usually can be interpreted as an error code. Well-behaved UNIX commands, programs, and exit bash shell utilities return a 0 exit code upon successful completion, though there are some exceptions.
Likewise, functions within a script and the script itself return an exit status. The last command executed in the function or script determines the exit status. Within a script, an exit nnn command may be used to deliver an nnn bash not equal exit status to the shell (nnn must be an integer in the 0 - 255 range).When a script ends with an exit that has no parameter, the exit status of the script is the exit status of the last command executed in the script (previous to the exit).#!/bin/bash COMMAND_1 . . . COMMAND_LAST # Will exit with status of last command. exitThe equivalent of a bare exit is exit $? or even just omitting the exit.#!/bin/bash COMMAND_1 . . . COMMAND_LAST # Will exit with status of last command. exit $?#!/bin/bash COMMAND1 . . . COMMAND_LAST # Will exit with status of last command.here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About
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Bash Exit Function
Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up echo that outputs to stderr http://tldp.org/LDP/abs/html/exit-status.html up vote 479 down vote favorite 83 Is there a standard Bash tool that acts like echo but outputs to stderr rather than stdout? I know I can do echo foo 1>&2 but it's kinda ugly and, I suspect, error prone (e.g. more likely to get edited wrong when things change). bash share|improve this question edited Aug 19 '14 at 22:36 Steven Penny 1 asked Jun http://stackoverflow.com/questions/2990414/echo-that-outputs-to-stderr 7 '10 at 14:36 BCS 25.6k43146247 add a comment| 13 Answers 13 active oldest votes up vote 477 down vote accepted This question is old, but you could do this, which facilitates reading: >&2 echo "error" The operator '>&2' literally means redirect the address of file descriptor 1 (stdout) to the address of file descriptor 2 (stderr) for that command. depending on how deeply you want to understand it, read this: http://wiki.bash-hackers.org/howto/redirection_tutorial To avoid interaction with other redirections use subshell (>&2 echo "error") share|improve this answer edited Apr 8 at 7:25 Mateusz Konieczny 418519 answered May 8 '14 at 18:59 Marco Aurelio 5,0341913 81 alias errcho='>&2 echo' –BCS Aug 5 '14 at 21:29 3 @macmac, could you offer an explanation of this syntax or a link to more information? –allonhadaya Sep 25 '14 at 23:13 8 @allonhadaya, the operator '>&2' literally means redirect the address of file descriptor 1 (stdout) to the address of file descriptor 2 (stderr) for that command. depending on how deeply you want to understand it, read this: wiki.bash-hackers.org/howto/redirection_tutorial –John Morales Jan 6 '15 at 14:21 13 @BCS I dunno about using an alias in a shell script.
code returned by the last shell command you ran, the incantation to retrieve it in the bash shell is: echo $? Given the nature of this variable (no one https://blog.yimingliu.com/2009/01/01/check-last-exit-status-code-in-bash-shell/ indexes text like ‘$?'), it's annoyingly hard to Google for. This entry was posted in Software, Solutions and tagged bash, dollar sign, exit code, exit status, question mark, shell on January 1, 2009 by yiming. Post navigation ← Apple Remote Desktop black screen and old machines Building from source package on Debian / Ubuntu to fix sudo PATH issue → 4 thoughts on “check last exit exit code status code in bash shell” Pete March 18, 2010 at 11:55 am Thanks for this! I am porting shell code from OpenVMS to Unix, and was searching for the equivalent to DCL's $status. Reply ↓ TaG November 23, 2012 at 7:41 pm Thanks! Reply ↓ Paul August 22, 2013 at 7:55 am Hey, if you're trying to help people searching for "$?", you should tag the post print error code with the phrase(s) people might search for. Bash dollar sign question mark! And thanks by the way, this is what I was looking for. Reply ↓ CMS November 22, 2014 at 7:42 am Thanks! Reply ↓ Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Search Search for: Recent Posts check progress of photoanalysisd Setting up OpenSSH Server on Windows 10 Anniversary Update Not paying OnTheHub to redownload Windows ISOs Python multiprocessing code crashes on OS X under IPython Setting up a Gmail POP3 account for Mail.app on 10.10.3 beta yliu | SelfSolved#132: Photoanalysisd consuming 100% CPU#127: Mail.app stuck at fetching mail for gmail accounts on 10.10.3#124: Exclude /etc/hosts from bash_completion#119: Set execute permission for directories#116: Disable Dell Studio XPS wireless buttonTagsAirPort Apple browser bug Cocoa code compilation dynamic library email email archival email client Entourage error GCC gotcha HTML IMAP information Internet Explorer Javascript libtool Mac Microsoft Microsoft Office networking OpenSSL opinion OS X PHP Projects Python research paper Safari SelfSolved SSH Subversion SVN transcode Ubuntu UI Windows Word workaround XHTML XP Archives September 2016 August 2016 December 2015 July 2015 February 2015 November 2014 Februa