linux common commands --- for example with Ubuntu

Common commands

• pwd view the current directory
• which view the command position

• tree displays a tree view

  -d display only directory

• Create a directory mkdir

  -p create recursive

• cat file 1, file 2 to view the file contents

  -n Display line numbers

• rm delete files

  -r delete a directory
  -f Do not prompt

• cp Copy

  -r copy, directory
  -a save the file attributes, and recursively copy
  -v show progress

• mv move and rename

  -i prompt
  -v displays the progress of mobile
  -f Do not prompt

• grep 'to retrieve the contents of' file name

  -n displays the number of rows
  -v Invert
  -i to ignore case

• find Find

  -name Specifies the name lookup, the available regular expression
  -size specify the size for example find ./ -size + 5k -size -6k locate files between 5k to 6k of
  -perm 777 specified search the current directory permissions to 777 file

• ln

  -s soft connection

• tar creates compression and decompression

  -zcvf -z unzip .gz -j decompress .bz2 -c -v to create a package file lists in detail the process then file -f specify the file name
  -zxvf

  system

• ps check process

  -a display terminal all processes of other users or processes -u -x Display detailed display process without the controlling terminal displays only -r process currently performed

• top Dynamic Display

  Senior htop

• shutdown shutdown

  -h now right now off time or may specify a specific time -h Example: 12: 00 -h +10 10 minutes after shutdown

• View space df system
• du view the current directory space

• View or modify the network card ifconfig website

  ifconfig ip address of the network card name

• date view time

• cal -y View Calendar

  Users and Permissions

• who view the login account
• whoami view the current login account
• / Etc / passwd accounts, home directory ...

• / Etc / group group information

  Groupmod or twice tab to view group

• useradd -m Add Account user name, no password by default
• passwd user name user password
  
• userdel -r delete the account, delete the home directory colleagues

• usermod

  -g is used to specify the default group the user belongs
  to the user to add a sudo permissions usermod -a (add) -G (a specified group) sudo adm user name

• groupadd group name to create groups
• groupdel group name Delete group
• modify the file owner chown

• chgrp group file name modify file group

  Remote Connection

• ssh username @ip address