You can use command which (use to locate a command). which returns the pathnames of the files which would be executed in the current environment, had its arguments been given as commands in a strictly POSIX-conformant shell. It does this by searching the PATH for executable files matching the names of the arguments.
Syntax:
which {command-name}
Examples:
$ which ls
/bin/ls
$ which gcc
/usr/bin/gcc
See also:
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