How do I find my Linux return code?
To check the exit code we can simply print the $? special variable in bash. This variable will print the exit code of the last run command.
What is exit code 1 Linux?
The only general convention is that a zero exit status signifies success, whereas any non-zero exit status is a failure. Many — but certainly not all — command-line tools return exit code 1 for syntax error, i.e. you had too few arguments or an invalid option.
How do I return in Linux?
return command is used to exit from a shell function. It takes a parameter [N], if N is mentioned then it returns [N] and if N is not mentioned then it returns the status of the last command executed within the function or script. N can only be a numeric value.
What is exit status in Unix?
Every Linux or Unix command executed by the shell script or user has an exit status. Exit status is an integer number. 0 exit status means the command was successful without any errors. A non-zero (1-255 values) exit status means command was a failure.
What is exit code 2 Linux?
Exit code 2 signifies invalid usage of some shell built-in command. Examples of built-in commands include alias, echo, and printf.
How do I return in Unix?
What is exit code 8 Unix?
If the return code is 4 or less, program it to execute another run task script on the PNODE that only has a statement of exit 5. Then the $? Variable is set to 8 when exiting the Connect:Direct part of the UNIX script.
How do I set the return code in Bash?
For completeness, exit and return each accept an optional argument which is an integer (positive, negative or zero) which sets the return code as the remainder of the integer after division by 256. The current shell (or script or subshell*) is exited using exit and a function is exited using return.
What are the exit codes for Linux and Unix?
These are the standard error codes in Linux or UNIX. 1 – Catchall for general errors. 2 – Misuse of shell builtins (according to Bash documentation) 126 – Command invoked cannot execute. 127 – “command not found”. 128 – Invalid argument to exit. 128+n – Fatal error signal “n”.
What are the standard error codes in Linux?
These are the standard error codes in Linux or UNIX. 1 – Catchall for general errors; 2 – Misuse of shell builtins (according to Bash documentation) 126 – Command invoked cannot execute; 127 – “command not found” 128 – Invalid argument to exit; 128+n – Fatal error signal “n” 130 – Script terminated by Control-C; 255\\* – Exit status out of range
How to get the status of a command in Linux?
The signal code is added to 128 (128 + SIGNAL) to get the status (Linux: man 7 signal, BSD: man signal ), few examples below: 137 – if command is sent the KILL (9) signal (128+9), the exit status of command otherwise