Locate a program file in the user's path
Syntax which command ...
Display the command that will be executed by the shell after substitutions, path searching, etc.
The builtin command is just like which(1), but it correctly reports
tcsh aliases and builtins and is 10 to 100 times faster.
"God shows his contempt for wealth by the kind of person he selects to receive it" - Austin O'Malley
find - Search for files that meet a desired criteria
grep - Search file(s) for lines that match a given pattern
ls - List information about file(s)
locate - Find files
where - Report all known instances of a command