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Bash Script Exit On Error


The second use, ${1:-"Unknown Error"} means that if parameter 1 ($1) is undefined, substitute the string "Unknown Error" in its place. exit $?

#!/bin/bash COMMAND1 . . . 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 ] How to tell my parents I want to marry my girlfriend Custom ColorFunction for GeoGraphics plot with ReliefMap Output N in base -10 Word for unproportional punishment? have a peek here

to find out the exit status of command. $? A few rebus puzzles Cost effective drivetrain maintanance What in the world happened with my cauliflower? but if the then or else clauses are somewhat more complex, it is more maintainable. –tripleee Aug 23 '12 at 7:14 7 [[ $rc != 0 ]] will give you Also, note the inclusion of the LINENO environment variable which will help you identify the exact line within your script where the error occurred. #!/bin/bash # A slicker error handling routine http://linuxcommand.org/wss0150.php

Bash Script Exit On Error

COMMAND_LAST # Will exit with status of last command.

$? reads the exit status of the last command I guess the problem is that invoking sudo as part of the test allows for sudo squashing the return of command in the first place and so skewing the test. –mikeserv Another example to clarify further: spd-say "[email protected]" [ $? -ne 127 ] && exit $?

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: You can save the exit status using a variable: command -p sudo ... rollback() { del_from_passwd $user if [ -e /home/$user ]; then rm -rf /home/$user fi exit } trap rollback INT TERM EXIT add_to_passwd $user cp -a /etc/skel /home/$user chown $user /home/$user -R Last Exit Code Destiny Why do CDs and DVDs fill up from the centre outwards?

the rest of the script goes here # function catch_errors() { # do whatever on errors # # echo "script aborted, because of errors"; exit 0; } share|improve this answer answered Bash Set Exit Code if [ $filename = "foo" ]; will fail if $filename contains a space. 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 http://stackoverflow.com/questions/90418/exit-shell-script-based-on-process-exit-code ls /eeteec echo $?

If you add a -p option then mkdir will create all the parent directories before creating the requested directory. Exit Code 0 This is stored in OUT variable. Consider following shell script:#!/bin/bash echo -n "Enter user name : " read USR cut -d: -f1 /etc/passwd | grep "$USR" > /dev/null OUT=$? Reply Link saravanakumar June 12, 2011, 2:44 pmVery useful…thanks a lot…its makes me to understand about "$?".

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Bash Set Exit Code

true\" = $?" # 1 # Note that the "!" needs a space between it and the command. # !true leads to a "command not found" error # # The '!' click to read more eval '[ "$?" = 127 ] || exit '"$?" Which basically allows you to expand the initial value for $? Bash Script Exit On Error Thanks for sharing, and thanks for the above comment. Exit Bash Shell It's free: ©2000-2017 nixCraft.

After a function returns, $? gives the exit status of the last command executed in the function. http://3swindows.com/exit-code/c-environment-exit-codes.html share|improve this answer edited Jan 7 '16 at 1:24 answered Sep 18 '08 at 6:08 paxdiablo 505k12210001454 32 Same feature in just one line of portable code: ls -al file.ext Using them, we can see how the $? As a previous poster noted, "set -e" will cause bash to exit with an error on any simple command. "set -o pipefail" will cause bash to exit with an error on Bash Neq

cmd1 exit code is in ${PIPESTATUS[0]}, cmd3 exit code in ${PIPESTATUS[2]}, so that $? Privacy - Terms of Service - Questions or Comments The exit status of a command From Linux Shell Scripting Tutorial - A Beginner's handbook Jump to: navigation, search ← Multilevel if-then-elseHomeConditional I've broken my new MacBook Pro (with touchbar) like this, do I have to repair it? Check This Out I am running Ubuntu Dapper Drake Linux.Keep it coming, it is good stuff.Rob Reply Link Rob April 3, 2007, 6:59 pmG'day again,Nope, I was wrong the script works I didn't copy

So, ssh returns zero in that instance. Shell Script Return Value The last exit $? What does the expression 'seven for seven thirty ' mean?

share|improve this answer edited Jun 14 '15 at 5:34 answered Jun 14 '15 at 1:03 mikeserv 38.1k444114 add a comment| up vote 8 down vote There are various options to handle

Using parameter expansion, it is possible to perform a number of useful string manipulations. You can combine the grep and if command in a single statement as follows: if grep "^$username:" /etc/passwd >/dev/null then echo "User '$username' found in $PASSWD_FILE file." else echo "User '$username' For more details see the following link. Bash Exit On Error Type the following command: date To view exist status of date command, enter: echo $?

What other weird restrictions are going to be made up? –llua Jun 13 '15 at 18:03 1 @mikeserv; In case you missed it: I said: "There was a very first All rights reserved. IMHO it's better to stick to a consistent method which works in other cases (and can also help with the code readability). –Dan Cornilescu Jun 13 '15 at 15:46 4 http://3swindows.com/exit-code/python-script-return-value-to-shell.html Bruteforcing a keypad lock Circular Array Rotation 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

share|improve this answer answered Sep 18 '08 at 6:09 Allen 4,0101428 21 What does it do? To explain how they work, I will quote from the bash man page: "The control operators && and || denote AND lists and OR lists, respectively. For example run command called cyberciti $ cyberciti Output:bash: cyberciti: command not foundDisplay exit status of the command: $ echo $? Use set -u How often have you written a script that broke because a variable wasn't set?

echo "ls command exit stats - $status" Exit Status Shell Script Example A simple shell script to locate username (finduser.sh) #!/bin/bash # set var PASSWD_FILE=/etc/passwd # get user name read -p