CODEWITHSUNDEEP
bashshellzsh
living zhang
living zhang

Reputation: 359

Can shell run a specific comand after 'command not found'

I want to execute a pre-set command automatically after I run some command witch can not be found. Is there any solution?

Let me clear my question. Set a command, and this command will be executed automatically when I type some command in the shell and get "command not found" result.

Upvotes: 2

Views: 572

Answers (3)

rools
rools

Reputation: 1675

With zsh, use the function command_not_found_handler:

command_not_found_handler () {
  echo Oups
}

With bash, use the function command_not_found_handle:

command_not_found_handle () {
  echo Oups
}

Using this mechanism, there is a tool for Archlinux that gives you the package that contains your missing command. This tool is called command_not_found and is available on AUR and on Github. Similar applications exist for other distributions.

Upvotes: 5

CWLiu
CWLiu

Reputation: 4043

Try the command to achieve your goal,

cmd1 2>&1 | grep "command not found" > /dev/null && cmd2

Brief explanation,

  1. cmd1: is the command may no be found in your system
  2. cmd2: if error message for cmd1 is "command not found", execute cmd2

Upvotes: 0

zwer
zwer

Reputation: 25789

The same way you can chain commands to execute only if previous was successful using the logical and operator:

command1 && command2

you can use the logical or operator to have command2 run only if command1 failed:

command1 || command2

This will, however, capture all error states from command1, not just the not found condition.

Upvotes: 1

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