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Bash Shell Return Code 255


Join them; it only takes a minute: Sign up ssh script returns 255 error up vote 12 down vote favorite 3 In my code I have the following to run a Since exit code 1 signifies so many possible errors, this might not add any additional ambiguity, but, on the other hand, it probably would not be very informative either.

There Exit Codes With Special Meanings

Table E-1. Why study finite-dimensional vector spaces in the abstract if they are all isomorphic to R^n? Source

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?). On the other hand, practically speaking is it really useful to have >255 exit codes? The author of this document proposes restricting user-defined exit codes to the range 64 - 113 (in addition to 0, for success), to conform with the C/C++ standard. To add our own exit code to this script, we can simply use the exit command.

Ssh Exit Code 255

I've noticed that when I return -1 in C++ program and then check the exit status, I get 255. Why is this important? 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

If you really wanted something more powerful I'd suggest that you'd switch to an "exit string", instead of a numeric exit code with a wider range. Exit Codes With Special Meanings

Table C-1. "Reserved" Exit Codes

Exit Code NumberMeaningExampleComments1catchall for general errorslet We can also use this variable within our script to test if the touch command was successful or not. Exit Code 255 Minecraft Why shouldn’t I use Unicode characters to simulate typographic styles (such as small caps or script)?

Thanks for that additional information. –George M May 4 '12 at 17:06 Thank you for your detailed answer! –Eugene S May 4 '12 at 20:15 add a comment| up Exit Code 255 Windows Most likely it's the function backup_mysql_rsnapshot that has the failing part as the other two functions return 999 in case of failure. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed In this case, the last run command is the echo command, which did execute successfully.

Feb 14 '13 at 23:41 script works fine locally. Linux Exit Codes COMMAND_LAST # Will exit with status of last command. share|improve this answer answered Feb 14 '13 at 23:28 that other guy 47.1k54375 add a comment| up vote 0 down vote I was stumped by this. This macro should only be employed if WIFEXITED returned true.

Exit Code 255 Windows

This - and only this - makes it possible to determinate the success or failure of an operation. dig this One thing I have noticed is sometimes scripts use exit codes and sometimes they don't. Ssh Exit Code 255 share|improve this answer answered Feb 14 '13 at 23:30 P.P. 60.9k770122 SSH'ing in works fine. –Amanada Smith Feb 14 '13 at 23:31 Then it's the script you Exit Code 255 Java This consists of the least significant 8 bits of the status argument that the child specified in a call to exit(3) or _exit(2) or as the argument for a return statement

Coprimes up to N Why does rotation occur? this contact form Please keep this field empty: Show pagesource Old revisions Backlinks dict/terms/exit_status.txt · Last modified: 2015/03/17 02:46 by ormaaj This site is supported by Performing Databases - your experts for database Values The code is a number between 0 and 255, where the part from 126 to 255 is reserved to be used by the Bash shell directly or for special purposes, How do you remove a fishhook from a human? Bash Exit Code Check

Privacy - Terms of Service - Questions or Comments Bash Hackers Wiki Home Search Tools Site Tools Recent Changes Media Manager Sitemap Page Tools Show pagesource Old revisions Backlinks Back to test bash bash (POSIX) zsh (emulate ksh) ksh93 mksh posh dash busybox heirloom f() { echo $?; }; :; f `false` 1 1 1 1 0 0 0 0 1 f() ls | bogus_command # bash: bogus_command: command not found echo $? # 127 ! Especially if that script is used for the command line.

Victorian Ship Weighing What is the importance of Bézout's identity? Bash If Exit Code Not 0 If scripts do not properly use exit codes, any user of those scripts who use more advanced commands such as list constructs will get unexpected results on failures. The parameter to the exit (exit the shell/script) return (return from a function) builtin commands serve the purpose of giving the exit status to the calling component.

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I ended up with a mysterious error code 1. Do you say prefix K for airport codes in the US when talking with ATC? Please enable JavaScript to view the comments powered by Disqus. Exit Code 0 Verify to make sure you can run 'true' instead, to see if the ssh connection is established successfully.

exit / exit status

#!/bin/bash echo hello echo $? # Exit status 0 returned because command executed successfully. The author of this document will not do fixups on the scripting examples to conform to the changing standard. Using exit codes in your bash scripts While removing the echo command from our sample script worked to provide an exit code, what happens when we want to perform one action Check This Out Feb 15 '13 at 0:04 | show 2 more comments up vote 6 down vote This error will also occur when using pdsh to hosts which are not contained in your

Make sure correct path is set in $0." [ ! -x $MYSQLADMIN ] && die "File $MYSQLADMIN does not exists. In C programs, this is represented by the return value of the main() function or the value you give to exit(3). pipeline). However, many scripts use an exit 1 as a general bailout-upon-error.

I doubt it. For example, exit 3809 gives an exit code of 225 (3809 % 256 = 225).

[2]An update of /usr/include/sysexits.h allocates previously unused exit Solve equation in determinant Coprimes up to N Confusion in fraction notation Iteration can replace Recursion? share|improve this answer answered Mar 18 at 21:59 community wiki Steven the Easily Amused add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up

SSH client is a program for logging into a remote machine and for executing commands on a remote machine. The code is the most basic: int main() { return -1; } Then, after running the compiled code: echo $? 255 shell exit share|improve this question edited May 4 '12 at But the -x '-tt' trick is what forces a psuedo tty to be allocated. Make sure correct path is set in $0." [ ! -x $MKDIR ] && die "File $MKDIR does not exists.

So it caps it to that range, I'm actually as surprised as you are. Follow him on Twitter. 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 A similar standard for scripting might be appropriate.

It may be anticipated that the range of unallotted exit codes will be further restricted in the future.