Bash Get the Exit Status Code of the Last Command
In a Bash shell the exit status a k a exit code or return code of the last command you ran is stored in the special parameter In a terminal session you can print out that value using echo Copy echo As an example let s run the type command and then get its exit status
Linux bash exit status and how to set exit status in bash, Each Linux or Unix command returns a status when it terminates normally or abnormally You can use value of exit status in the shell script to display an error message or run commands For example if tar command is unsuccessful it returns a code which tells the shell script to send an e mail to sysadmins nixCraft Privacy First Reader Supported
Are there any standard exit status codes in Linux
12 Answers Sorted by 388 Part 1 Advanced Bash Scripting Guide As always the Advanced Bash Scripting Guide has great information This was linked in another answer but to a non canonical URL 1 Catchall for general errors 2 Misuse of shell builtins according to Bash documentation 126 Command invoked cannot execute
How to use Linux shell command exit codes Enable Sysadmin, How to use Linux shell command exit codes You can use the numeric codes returned by shell scripts or Ansible playbooks to identify problems and test the code Posted June 23 2022 Roberto Nozaki Sudoer Red Hat Exit by andrewmalone is licensed under CC BY 2 0 When you execute a command in Linux it generates a numeric return code
Standard Exit Status Codes in Linux Baeldung on Linux
Standard Exit Status Codes in Linux Baeldung on Linux, 3 1 General Error 1 This is the most used exit code and should be used as a catch all value for miscellaneous errors 3 2 Misuse of Shell Built in 2 Exit code 2 signifies invalid usage of some shell built in command Examples of built in commands include alias echo and printf 3 3
History Of Information
3 7 5 Exit Status GNU
3 7 5 Exit Status GNU For the shell s purposes a command which exits with a zero exit status has succeeded A non zero exit status indicates failure This seemingly counter intuitive scheme is used so there is one well defined way to indicate success and a variety of ways to indicate various failure modes
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Exit Codes Exit codes are a number between 0 and 255 which is returned by any Unix command when it returns control to its parent process Other numbers can be used but these are treated modulo 256 so exit 10 is equivalent to exit 246 and exit 257 is equivalent to exit 1 These can be used within a shell script to change the flow of Returning information from a shell script via an Exit Code The Shell . Bash command line exit codes demystified If you ve ever wondered what an exit code is or why it s a 0 1 2 or even 255 you re in the right place When you execute a command or run a script you receive an exit code An exit code is a system response that reports success an error or another condition that provides a clue about what caused Your script is not doing what you want because when timeout t 10 command has an exit status of 0 which is the exit status that is regarded as true in shell scripting the command timeout t 10 command 143 just completes with an exit status of 0 and does not cause the right hand side of to be run
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