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echo $? # Non-zero exit status returned -- command failed to execute. This signal is generated by the kernel in response to a bad page access, which causes the program to terminate. More exit codes The exit command in bash accepts integers from 0 - 255, in most cases 0 and 1 will suffice however there are other reserved exit codes that can Hot Network Questions How to map and sum a list fast? http://waspsoft.com/bash-error/bash-error-codes-list.html

Do you want to help us debug the posting issues ? < is the place to report it, thanks ! If the touch command fails however, we will print a failure message to stderr and exit with a 1 value which indicates failure. The signal code is added to 128 (128 + SIGNAL) to get the status (Linux: man 7 signal, BSD: man signal), few examples below: 130 - command terminated due to Ctrl-C is not executable) Permission problem or command is not an executable.

Bash Error Code 255

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. It seems to date back to at least 1993 and some big projects like Postfix use it, so I imagine it's the way to go. Force Microsoft Word to NEVER auto-capitalize the name of my company How could banks with multiple branches work in a world without quick communication? is the problem.

  • A while ago, I wrote a script which used the following exit status codes: 0 - success 1 - incorrect hostname 2 - invalid arguments specified 3 - insufficient user privileges
  • How to pluralize "State of the Union" without an additional noun?
  • That is, the program's ability to handle situations in which something goes wrong.
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Relevant POSIX specifications I researched what POSIX has to say about exit codes and the POSIX specification seems to concur with the author of the Advanced Bash-Scripting Guide. What could cause the throttle to stick in my Ford Ranger? 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 Bash Error Code 127 exit takes only integer args in the range 0 - 255.

STATUS_STACK_OVERFLOW). if [ $? -ne 0 ];then echo "Error type" exit 1 fi share|improve this answer answered Nov 10 '15 at 13:34 Centimane 1,317417 add a comment| up vote 4 down vote By not defining proper exit codes you could be falsely reporting successful executions which can cause issues depending on what the script does. more hot questions question feed lang-bsh about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation

The next approach we can try is to use the if statement directly, since it evaluates the exit status of commands it is given. Bash Error Code Of Last Command share|improve this answer answered Jul 9 '09 at 6:54 Daniel Schuler 1,3521620 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Within the parenthesis the commands are chained together using the && and || constructs again. I wasn't expecting such an elaborate answer.

Bash Error Code Of Previous Command

Why is this important? I might need to come up with some reasonable mapping. –PSkocik Nov 11 '15 at 15:10 1 Wow! Bash Error Code 255 Unhandled errnos propagate upwards, like exceptions, (the errno stays, functions return e.g., -1 or 0|NULL). Bash Error Code Handling Enter an check results - seems to be all OK. [[email protected] tests]$ [[email protected] tests]$ ls -l test1_6_conf.txt -rw-rw-r--. 1 A A 2641 Nov 22 14:19 test1_6_conf.txt [[email protected] tests]$ I am using

Bash (or any other Unix shell) won’t do anything special (such as running exception handlers) if a user script exits with one of these error codes. weblink Some people just put them around every variable out of habit. However, it would possibly be confusing if you encounter anyone who knows and uses the reserved error codes, which seems quite rare. However, some programs do return errnos, and I actually think returning errnos makes the most sense. Bash Error Code 2

This becomes more important as your programs get more complex and you start having scripts launching other scripts, etc. is then up to the shell. To explain how they work, I will quote from the bash man page: "The control operators && and || denote AND lists and OR lists, respectively. navigate here You can read more about parameter expansion in the bash man page under the topic "EXPANSIONS".

Much more important to know that none of this is in POSIX, and that most of the things you cite as "real Unix systems" don't provide a POSIX-compliant /bin/sh anyway.) –zwol Bash Error Code Variable Advanced Bash-Scripting Guide: PrevNext

Appendix E. In that case, the shell will interpret the variable as empty and the cd succeed, but it will change directories to the user's home directory, so beware!

Thanks.

Join them; 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 GNU grep documents that exit code 0 means at least one match was found, 1 means no matches were found, and 2 means an I/O error occurred; this convention is obviously Which requires more energy: walking 1 km or cycling 1 km at the same speed? Bash Error Code 126 exit

The equivalent of a bare exit is exit $? or even just omitting the exit.

#!/bin/bash COMMAND_1 . . .

exit2str.sh PROMPT_COMMAND='lastStatus=$(st="$?"; echo -n "$st"; str=$(exit2str "$st") && echo "=$str"); # ...' PS1="$PS1"'\n($lastStatus)\$' # ... Reserved Exit Codes

Exit Code NumberMeaningExampleComments1Catchall for general errorslet "var1 = 1/0"Miscellaneous errors, such as "divide by zero" The idea of "reserved exit codes" doesn't really apply anymore other than to say it's customary to use 0 as a success code and anything else as a failure code. http://waspsoft.com/bash-error/bash-error-code-255.html and the Cygwin people says that they are bug by bug Linux compatible ;-) –schily Nov 10 '15 at 15:39 2 The OP tagged the question with bash and mentioned