which command

Bash Shell Find Out If A Command Exists On UNIX / Linux System ($PATH) OR Not

by Vivek Gite on April 6, 2010 · 3 comments

I want find out if a command exists on UNIX from a bash shell script. If command does not exists, then I would like to display an error message on screen. How do I find out if a command exists on Posix system or not?

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Linux / UNIX: Command not found error and how do I get rid of it?

by Vivek Gite on January 17, 2006 · 35 comments

Q. Why I am getting the error Command not found? How do I fix this problem? A. A common question asked by new Linux or UNIX users. When you get the error “Command not found” it means that Linux or UNIX searched for command everywhere it knew to look and could not find a program [...]

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