Essential linux tools

Essential linux tools

whoami --help

hostname --help | less


passwd #for setting a password

su - #switch user, easiest way to switch user.
# the `-` opens a login shell with the full environment of the target user.
# on ubuntu systems su - doesn't work since root doesn't have a password
# The alternative is to use:
su -i

touch #creates an empty file

last #shows last people who logged in

mandb #updates the command database / man database

Which man page to use

man -k <keyword>
man -k user | wc

man -k user | grep 8 | grep create
pinfo coreutils 'whoami invocation'

Getting help

  • man
  • pinfo
  • command --help
  • /usr/share/doc