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One Day One Command
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which — Shows the location of (shell) commands.

Summary:

which will search for the given command in the PATH and prints the
full path of the executables that would have been executed when this
command had been entered at the shell prompt.

Examples:

$ echo $PATH — Show the search path for commands.

$ which ls — Print the 1st matching location and alias.

$ which -a kill — Print all matchings.

$ which –skip-alias ls — Don’t print the ls alias.

$ which –skip-dot gcc — Skip Dirs in PATH that start with a dot.

$ which –skip-tilde test — Skip Dirs in PATH that start with a tilde

                 and executables which reside in the HOME directory.

$ which ls rm cp — Search for multiple commands.

$ which NoCmd — Just Try..

Read: man which

HTH 🙂