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Reply Link davb March 6, 2013, 4:05 pmActually, rather than grep “^”"$USR”"$”, just use grep -w $USR ….easy! Should we eliminate local variables if we can? Output N in base -10 Are there any rules of thumb for the most comfortable seats on a long distance bus? b. check these guys out

Shell Script Exit Code

When command1 exits, the printf fires and prints its exit status, which is captured into the variable by the command substitution. This variable will print the exit code of the last run command. Digital Hardness of Integers The Ooh-Aah Cryptic Maze Why do shampoo ingredient labels feature the the term "Aqua"?

share|improve this answer answered Sep 18 '08 at 6:09 Allen 4,0101428 21 What does it do? is to use it, no? Before: foo | bar | baz, however this only returns the exit code of the last command (baz) Wanted: $? Exit Code 0 This is Bash's way of giving functions a "return value." [1]

Following the execution of a pipe, a $? gives the exit status of

How do I use threaded inserts? Bash Set Exit Code Anyway, that's how you can do that. If the exit code is anything other than 0 this indicates failure and the script will echo a failure message to stderr. http://stackoverflow.com/questions/90418/exit-shell-script-based-on-process-exit-code Why are Zygote and Whatsapp asking for root?

lskdf # Unrecognized command. Bash Neq If you need to capture the output from bar, it gets difficult. Anyway, with local it does get clobbered - but if you catch it at just the right time - which is while the expansions are still being evaluated and before local's 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 Technology Life / Arts Culture / Recreation

Bash Set Exit Code

Step by step explanation of the construct: ( ( ( ( someprog; #part6 echo $? >&3 #part5 ) | filter >&4 #part4 ) 3>&1 #part3 ) | (read xs; exit $xs) http://bencane.com/2014/09/02/understanding-exit-codes-and-how-to-use-them-in-bash-scripts/ Just put that before any commands in your program. Shell Script Exit Code and ${PIPESTATUS[0]} Hello 22 and 0 –user3183018 Jan 7 '16 at 19:50 1 For those concerned about the unquoted variable expansion: The exit status is always unsigned 8-bit integer in Bash Script Exit On Error bash shell share|improve this question edited Jul 31 '11 at 19:12 Cerin 17.1k38144282 asked Sep 18 '08 at 6:03 Mark Roddy 11.2k95261 2 I answered assuming you're using bash, but

The problem with temporary variables is that they could shadow other variables, and to avoid that you must use long names, which is not good for code readability. this contact form This becomes more important as your programs get more complex and you start having scripts launching other scripts, etc. Example someprog and filter: someprog() { echo "line1" echo "line2" echo "line3" return 42 } filter() { while read line; do echo "filtered $line" done } ((((someprog; echo $? >&3) | in case someone executes the script via bash foo.sh. –maxschlepzig Jun 3 '11 at 9:17 How does that work? Exit Bash Shell

exit $?

#!/bin/bash COMMAND1 . . . While command1 is running, its stdout is being piped to command2 (printf's output never makes it to command2 because we send it to file descriptor 3 instead of 1, which is share|improve this answer edited Jan 7 '16 at 1:24 answered Sep 18 '08 at 6:08 paxdiablo 505k1229991454 32 Same feature in just one line of portable code: ls -al file.ext have a peek here 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

or something like that? –David Z Jun 14 '15 at 1:59 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign Exit Status Reply Link Poonam August 20, 2008, 8:22 amI tried to find out, but did not find anything. I like to include the name of the program in the error message to make clear where the error is coming from.

into the tail of the script before ever even testing its value at its head.

Use mktemp, which is not POSIX but available on all serious unices nowadays. Look at this for instance: $ ls filenotfound.txt; echo $? Afterwards the file's contents are read. Exit Code 1 Detect MS Windows How should I respond to absurd observations from customers during software product demos?

Also, as I understand it, $? In that case, the cd command will fail and the script executes the rm command on the current working directory. Why would two species of predator with the same prey cooperate? http://juicecoms.com/exit-code/bash-if-exit-code-not-0.html special variable in bash.