Often a wrapper for the
man -k command, the apropos command is used to search all manual pages for the string specified. This is often useful if one knows the action that is desired, but does not remember the exact command or page name.
The following example demonstrates the output of the apropos command:
$ apropos mount free (1) - Display amount of free and used memory in the system mklost+found (8) - create a lost+found directory on a mounted Linux second extended file system mount (8) - mount a file system mountpoint (1) - see if a directory is a mountpoint ntfsmount (8) - Read/Write userspace NTFS driver. sleep (1) - delay for a specified amount of time switch_root (8) - switch to another filesystem as the root of the mount tree. umount (8) - unmount file systems
In this example, apropos is used to search for the string "mount", and apropos returns the indicated man pages that include the term "mount".