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The ways to run the last executed command are as follows: Ctrl + P. Up Arrow key.
“$?” is a variable that holds the return value of the last executed command. “echo $?” displays 0 if the last command has been successfully executed and displays a non-zero value if some error has occurred. The bash sets “$?” To the exit status of the last executed process.
The return value of a command is stored in the $? variable. The return value is called exit status. This value can be used to determine whether a command completed successfully or unsuccessfully.
Extracting the elusive exit code To display the exit code for the last command you ran on the command line, use the following command: $ echo $? The displayed response contains no pomp or circumstance. It's simply a number.
You can use the shell variable $?
Such as:
$ true ; echo $?
0
$ false ; echo $?
1
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