Linux Command

details.md

Man pages common elements

• Command summary: shows how to use a command

  • Items between [brackets] are optional
  • If you see {a|b} youy must choose
  • And ... means you may have more of the preceding item

• Man pages have sections

  • 1 is for end-user commands
  • 8 is for administrator (root) commands
  • 5 is for configuration files

• many man pages have examples near the end

• use /sometest to search for sometext

• And use q to get out of the man page

  man whoami

  man lvcreate

  g G n

  man -k user

  man -k user | wc

  mam man

  man -k user | grep 8

  man -k user | grep 8 | create

  mandb

Help Systems Overview

• man is the primary source

• pinfo shows usage information for some commands

• command --help provides short usage overview

• /usr/share/doc contains additional help for some commands

  cd nano-2.3.1/

  ls

  ls -l

  cd /usr/share/doc/nano/fag.html

  cd /usr/share/doc/pam

lab.md

LAB 1

1. Find out which version of the kernel you computer is using

   man -k kernel man -k kernel | grep information man uname uname -r <-- Answer

2. Use man and related resources to find out how to change the hostname of your computer

   man hostname man -k hostname man hostnamectl hostnamectl --help

   set-hostname NAME <-- Answer

3. Read the help output for lvcreate and find which options must be used

   lvcreate --help

linux.md

1. whoami (who you are?)

2. hostname (current name of the host)

3. date (show date, time & year)

4. uname (kernel information)

5. passwd (setting password)

6. touch ( create empty file )

7. last ( last login in the system)

   whoami -- help

   whoami --help | less

   hostname --all-ip-addresses

   passwd root

   su -

   passwd user

   exit ( out of the root shell)

   touch hello

   ls

   cd ( to home directory )

   sudo -i ( for root account in Ubuntu )

8. man

9. man -k is same as apropos

   • The database searched by apropos is updated by the mandb program

10. pinfo ( text based documentation)

    pinfo coreutils 'whoami invocation'

    n - next

    p - previous

    u - up

    q - quit

    pinfo -a whoami

11. whoami, hostname, date, uname, passwd, touch, last, man, apropos, mandb, pinfo