Description - Mks.com

NAME
which, whereis
which, whereis — display full path name for executable command
SYNOPSIS
which [-a] command ...
whereis command ...
DESCRIPTION
Windows systems use the PATH environment variable to determine which directories are searched
to find programs. If PATH is not found under Windows NT/2000/XP/2003, which then searches for
Path. For each command, which looks through the directories in the search path, and displays the
name of the first executable file that matches command.
which uses the PATHEXT environment variable to determine which files are considered
executable. As which searches each directory in the search path, it appends each of the
extensions in the list, in turn, to command name to see if it matches a file name in that directory. If
a match exists, that file is considered to be executable.
If PATHEXT is not defined, which only considers files with a .exe, .com, .bat, or .cmd
extension to be executable.
Because which is intended primarily for use when working from the Windows command prompt, it
always searches the current directory first before consulting the search path in the same way that
Windows command interpreters (such as command.com and cmd.exe) do.
Note:
When running which from the Windows command prompt, not all executable files reported
may be directly executable from the prompt. Such files may require the use of an additional
program (such as a shell) to execute it. The program to use can normally be determined by
the file's extension. For example, files with a .sh extension should be executed using the
MKS KornShell.
The whereis command is equivalent to specifying which -a.
Options
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