Linux Sysadmin Basics 02 -- Basic Commands

• pwd [-LP]

  Print the name of the current working directory.

• ls [OPTION]… [FILE]…

  List information about the FILEs (the current directory by default).

  -a, --all        do not ignore entries starting with .

  -l        use a long listing format

  -h, --human-readable        with -l and/or -s, print human readable sizes (e.g., 1K  234M  2G)

• cd [-L|[-P [-e]] [-@]] [dir]

  Change the shell working directory.

  Change the current directory to DIR. The default DIR is the value of the HOME shell variable.

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• touch [OPTION]… FILE…

  Update the access and modification times of each FILE to the current time.

  A FILE argument that does not exist is created empty, unless -c or -h is supplied.

• cat [OPTION]… [FILE]…

  Concatenate FILE(s) to standard output.

• mkdir [OPTION]… DIRECTORY…

  Make directories

  Create the DIRECTORY(ies), if they do not already exist.

  -p, --parents        no error if existing, make parent directories as needed

• mv [OPTION]… [-T] SOURCE DEST

  or mv [OPTION]… SOURCE… DIRECTORY

  or mv [OPTION]… -t DIRECTORY SOURCE…

  Rename SOURCE to DEST, or move SOURCE(s) to DIRECTORY.

• rm [OPTION]… [FILE]…

  Remove (unlink) the FILE(s).

  • -f, --force        ignore nonexistent files and arguments, never prompt

  • -r, -R, --recursive        remove directories and their contents recursively

• rmdir [OPTION]... DIRECTORY...

  Remove the DIRECTORY(ies), if they are empty.

• cp [OPTION]... [-T] SOURCE DEST
  or: cp [OPTION]... SOURCE... DIRECTORY
  or: cp [OPTION]... -t DIRECTORY SOURCE...

  Copy SOURCE to DEST, or multiple SOURCE(s) to DIRECTORY.

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• clear [OPTION]

• man [OPTION...] [SECTION] PAGE...

  An interface to the on-line reference manuals.