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Exit Bash Shell

_ Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Join them; bash if exit code 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 top How to catch an error in a linux bash script?

Shell Script Exit On Error

up vote 5 down vote favorite 1 I made the following script: # !/bin/bash # OUTPUT-COLORING red='\e[0;31m' green='\e[0;32m' NC='\e[0m' # No Color # FUNCTIONS # directoryExists - Does the directory exist? function directoryExists { cd $1 if [ $? = 0 ] then echo -e "${green}$1${NC}" else echo -e "${red}$1${NC}" fi } # EXE directoryExists "~/foobar" directoryExists "/www/html/drupal" The script works, but beside my echoes, there is also the output when cd $1 fails on execution. testscripts//test_labo3: line 11: cd: ~/foobar: bash catch error No such file or directory Is it possible to catch this? bash shell shell-script error-handling share|improve this question edited Oct 22 '13 at 22:58 Gilles 374k696801129 asked Oct 22 '13 at 10:29 Thomas De Wilde 28114 Just an FYI, you can also do this a lot simpler; test -d /path/to/directory ( or [[ -d /path/to/directory ]] in bash ) will tell you whether a given target is a directory or not, and it will do it quietly. –Patrick Oct 22 '13 at 12:36 @Patrick, that just tests if it's a directory, not if you can cd into it. –Stéphane Chazelas Oct 22 '13 at 12:54 @StephaneChazelas yes. The function name is directoryExists. –Patrick Oct 22 '13 at 13:57 add a comment| 5 Answers 5 active oldest votes up vote 4 down vote accepted Your script changes directories as it runs, which means it won't work with a series of relative pathnames. You then commented later that you only wanted to check for directory existence, not the ability to use cd, so answers don't need to use cd at all. Revised. Using tput and colours from man terminfo: #!/bin/bash -u # OUTPUT-COLORING red=$( tput setaf 1 ) green=$( tput setaf 2 ) NC=$( tput setaf 0 ) # or perhaps: tput sgr0 # FUNCTIONS # directoryExists - Does the directory exist? function directoryExists { # was: do the cd in a sub-shell so it doesn't chang

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Linux Kernel Error Codes

more about hiring developers or posting ads with us Unix & Linux Questions Tags Users Badges Unanswered Ask Question _ bash if exit code not 0 Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Join them; it only takes a minute: Sign up Here's how http://unix.stackexchange.com/questions/97101/how-to-catch-an-error-in-a-linux-bash-script it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top How to capture error message from executed command? up vote 5 down vote favorite 1 I was tasked to create an automated server hardening script and one thing that they need is a report of all the output of each command executed. I want to http://unix.stackexchange.com/questions/132511/how-to-capture-error-message-from-executed-command store the error message inside a string and append it in a text file. Let's say I ran this command: /sbin/modprobe -n -v hfsplus The output of running this in my machine would be: FATAL: Module hfsplus not found How can I store that error message inside a string? Any help would be greatly appreciated. Thanks! bash scripting string share|improve this question asked May 29 '14 at 7:25 Miguel Roque 1173412 I tried running this command: var=$(/sbin/modprobe -n -v hfsplush) And then displaying it: $var But it still doesn't capture the error message inside the string. –Miguel Roque May 29 '14 at 7:42 add a comment| 4 Answers 4 active oldest votes up vote 10 down vote you can do it by redirecting errors command: /sbin/modprobe -n -v hfsplus 2> fileName as a script #!/bin/bash errormessage=$( /sbin/modprobe -n -v hfsplus 2> &1) echo $errormessage or #!/bin/bash errormessage=`/sbin/modprobe -n -v hfsplus 2> &1 ` echo $errormessage if you want to append the error use >> instead of > share|improve this answer edited May 29 '14 at 7:48 answered May 29 '14 at 7:42 Networker 4,74262956 I've tried that approach and i

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta http://stackoverflow.com/questions/64786/error-handling-in-bash Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack http://www.cyberciti.biz/tips/shell-displaying-error-messages.html Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.3 million programmers, just like you, shell script helping each other. Join them; it only takes a minute: Sign up Error handling in BASH up vote 144 down vote favorite 110 What is your favorite method to handle errors in BASH? The best example of handling errors in BASH I have found on the web was written by William Shotts, Jr at http://www.linuxcommand.org. William Shotts, shell script exit Jr suggests using the following function for error handling in BASH: #!/bin/bash # A slicker error handling routine # I put a variable in my scripts named PROGNAME which # holds the name of the program being run. You can get this # value from the first item on the command line ($0). # Reference: This was copied from PROGNAME=$(basename $0) function error_exit { # ---------------------------------------------------------------- # Function for exit due to fatal program error # Accepts 1 argument: # string containing descriptive error message # ---------------------------------------------------------------- echo "${PROGNAME}: ${1:-"Unknown Error"}" 1>&2 exit 1 } # Example call of the error_exit function. Note the inclusion # of the LINENO environment variable. It contains the current # line number. echo "Example of error with line number and message" error_exit "$LINENO: An error has occurred." Do you have a better error handling routine that you use in BASH scripts? bash error-handling error-logging share|improve this question asked Sep 15 '08 at 17:09 community wiki Noob add a comment| 14 Answers 14

updated March 20, 2016 in Debian Linux, FreeBSD, Linux, OpenBSD, RedHat/Fedora Linux, Shell scripting, Suse Linux, Ubuntu Linux, UNIX While writing a shell script you may need to display an error message. For example, if you failed to open /etc/passwd file you want to show an error message.

The old method You can write something as follows on bash using the if statement to test a condition cat /etc/shadow 2>/dev/null if [ $? -ne 0 ]; then echo "Failed to open file"; exit 1 ; fi The new way: OR || control operator However, you can use the control operator || (or lists). It has the form as follows: command1 || command2 command2 is executed if and only if command1 returns a non-zero exit status. For example: $ cat /etc/shadow 2>/dev/null || echo "Failed to open file" This way you display an error message. Another option is to create die shell function: #!/bin/bash function die(){ echo "$1" exit 1 } # ... # ... other code cat /etc/shadow 2>/dev/null || die "Failed to open file" # rest of my script AND (&&) control operator Similarly you can use AND (&&) control operator. It has the form/syntax: command1 && command2 The command2 is executed if, and only if, command1 returns an exit status of zero. For example: $ cat /etc/shadow 2>/dev/null && echo "I can open /etc/shadow file." You can combine both to produce useful message in a script: #!/bin/bash ... tar -zcf /dev/st0 /data2 && echo "/data2/ added to backup device" || echo "Warning: Cannot add /data2/ to backup device." .... Share this on:TwitterFacebookGoogle+Download PDF version Found an error/typo on this page?About the author: Vivek Gite is a seasoned sysadmin and a trainer for the Linux/Unix & shell scripting. Follow him on Twitter. OR read more like this:How do I find the exit status of a remote command executed via ssh?BASH Shell: How to run several commands in Sequence or all at onceHowTo: Debug a Shell Script Under Linux or UNIXBash shell script tip: Run commands from a variableTest your Samba server for configuration errorsLinux / UNIX: Find Out If a Directory Exists or NotTake action or execute a command based upon shell script nameLinux/UNIX: Find Out If File Exists With Conditional ExpressionsDebian / Ubuntu Package Troubleshooting: subprocess post-removal script…Increase productivity with FTP autologin and macros { 0 comments… add one } Security: Are you a robot or human? Please enable JavaScript to submit this form. Cancel reply Leave a Comment Name Email Comment Receive Email Notifications? no, do not subscribe yes, replies to my comment yes, all comments/replies

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