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Unix Script Return Code 2

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exit 2 please let me know, best regards. The list constructs use exit codes to understand whether a command has successfully executed or not. share|improve this answer edited Jul 9 '09 at 5:48 answered Jul 9 '09 at 5:43 Dean Povey 6,40212546 add a comment| up vote 3 down vote Here is the real, long-standing What does Joker “with TM” mean in the Deck of Many Things? http://qaisoftware.com/exit-code/unix-shell-script-echo-return-code-example.html

I've updated the answer to fix that one too, but it's hard to tell what you were trying to do there. –bazzargh Feb 20 '14 at 3:48 @hi All The second use, ${1:-"Unknown Error"} means that if parameter 1 ($1) is undefined, substitute the string "Unknown Error" in its place. This becomes more important as your programs get more complex and you start having scripts launching other scripts, etc. when you use it in echo - after that, it contains the exit code of echo itself. http://www.tldp.org/LDP/abs/html/exitcodes.html

Bash Exit Code Check

COMMAND_LAST # Will exit with status of last command.

$? reads the exit status of the last command It's not, if nothing goes wrong. Previous | Contents | Top | Next © 2000-2017, William E. The accepted answer explains what happens when a command is terminated by a signal.

  1. Either the code in your test2.sh is still wrong (as I said), or there's more code you've not posted which is also wrong. –bazzargh Feb 20 '14 at 4:35
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To check the exit code we can simply print the $? COMMAND_LAST # Will exit with status of last command. E.g., termination by SIGINT (signal 2) results in exit status 130. Exit Code 2 Windows If a program finishes successfully, the exit status will be zero.

wget also has detailed errors (e.g. 6 for authentication failure), but then they use 1 = generic error, 2..n = specific error –PypeBros Aug 30 '16 at 10:25 add a comment| Linux Exit Codes See man for ls: Exit status: 0 if OK, 1 if minor problems (e.g., cannot access subdirectory), 2 if serious trouble (e.g., cannot access command-line argument). exit / exit status

#!/bin/bash echo hello echo $? # Exit status 0 returned because command executed successfully. http://www.tldp.org/LDP/abs/html/exit-status.html So, unfortunately, the unix powers that be don't seem to enforce any logical set of rules, even on very commonly used executables.

main.cpp 0 And for a file that does not exists: ls main.cppp; echo $? Exit Code -11 Python share|improve this answer edited Jul 9 '09 at 5:36 answered Jul 9 '09 at 5:29 Chris Arguin 8,45222142 2 This should be the accepted answer. –tripleee Oct 10 '16 at if [[ $? -eq 0 ]]; then echo "inside" ./test1.sh fi shell unix exit-code share|improve this question edited Feb 20 '14 at 3:58 asked Feb 20 '14 at 2:23 user3326101 1613 In fact ls -ld /usr/*conf; would have had the same effect.

Linux Exit Codes

This should not cause any problems, since there is no overlap or conflict in usage of exit codes between compiled C/C++ binaries and shell scripts.

PrevHomehttp://bencane.com/2014/09/02/understanding-exit-codes-and-how-to-use-them-in-bash-scripts/ An error exit function Since we will be checking for errors often in our programs, it makes sense to write a function that will display error messages. Bash Exit Code Check Password Home Search Forums Register Forum RulesMan PagesUnix Commands Linux Commands FAQ Members Today's Posts Shell Programming and Scripting BSD, Linux, and UNIX shell scripting Post awk, bash, csh, ksh, Bash If Exit Code Not 0 in test.sh seems unnecessary since you're already testing for the existence of $FILES using -f. –ajk Feb 20 '14 at 2:57 1 Your test.sh is syntactically invalid - the nawk

undo a gzip recursively Rent clothing in Frankfurt / Being warm without cold weather clothing Hacker used picture upload to get PHP code into my site A Little Cryptic Puzzle TeXForm weblink I did it and I am wondering what is the meaning of output messages: [[email protected] tests]$ ls -ld /etc/*conf /usr/*conf > test1_6_conf.txt 2>&1 & Enter rises this row: [1] 2533 what This will save more typing and promote laziness. # An error exit function function error_exit { echo "$1" 1>&2 exit 1 } # Using error_exit if cd $some_directory; then rm * However, for other applications, there are different exit codes. Exit Code 0

Not the answer you're looking for? Written by Benjamin Cane on 2014-09-02 14:45:00| 4 min read Lately I've been working on a lot of automation and monitoring projects, a big part of these projects are taking existing inverts the exit status returned. http://qaisoftware.com/exit-code/unix-return-code-1.html up vote 217 down vote favorite 99 A process is considered to have completed correctly in Linux if its exit status was 0.

linux exit-code share|improve this question edited Oct 10 '16 at 8:41 Kyll 5,27152347 asked Jul 9 '09 at 5:24 Nathan Fellman 47.9k62194276 2 if you're looking for the thing called Bash Set Exit Code echo "Example of error with line number and message" error_exit "$LINENO: An error has occurred." The use of the curly braces within the error_exit function is an example of parameter expansion. What is the "crystal ball" in the meteorological station?

Join them; it only takes a minute: Sign up Are there any standard exit status codes in Linux?

The Linux Documentation Project has a pretty good table of reserved exit codes and what they are used for. Ending a script with exit 127 would certainly cause confusion when troubleshooting (is the error code a "command not found" or a user-defined one?). Aborting" rm * If an exit is not required in case of error, then you can even do this: # Another way to do it if exiting is not desired cd Misuse Of Shell Builtins When grep fails to find a pattern, it exits 1, but it exits 2 for a genuine failure (like permission denied).

share|improve this answer edited Dec 12 '16 at 9:08 answered Nov 8 '16 at 10:33 alexis 23.1k63380 add a comment| up vote 2 down vote When Linux returns 0, it means An exit value greater than 255 returns an exit code modulo 256. Preserving Vertices Why would two species of predator with the same prey cooperate? his comment is here true echo "exit status of \"!

Script: #!/bin/bash touch /root/test 2> /dev/null if [ $? -eq 0 ] then echo "Successfully created file" exit 0 else echo "Could not create file" >&2 exit 1 fi With the The return status of AND and OR lists is the exit status of the last command executed in the list." Again, we can use the true and false commands to see This signal is generated by the kernel in response to a bad page access, which causes the program to terminate. One thing I have noticed is sometimes scripts use exit codes and sometimes they don't.

Well-behaved UNIX commands, programs, and utilities return a 0 exit code upon successful completion, though there are some exceptions.

Likewise, functions within a script and the script System.exit(int status). It seems like exit codes are easy for poeple to forget, but they are an incredibly important part of any script. It is exit status of ls.

Why are Zygote and Whatsapp asking for root? Why is this important? Segmentation fault 139 $ expr 139 - 128 11 If you're seeing anything other than this, then the program probably has a SIGSEGV signal handler which then calls exit normally, so Word for unproportional punishment?

This becomes especially true if the script is used with automation tools like SaltStack or monitoring tools like Nagios, these programs will execute scripts and check the status code to determine For instance, many implementations of grep use an exit status of 2 to indicate an error, and use an exit status of 1 to mean that no selected lines were found.