Ubuntu Commands that developer should know

• cp  
  Copies the file
• scp
  Copies file from one host machine to another host machine.
• mv
  Moves the file/folder from one place to other.
• touch
  Creates the file
• mkdir
  Creates the directory. If you want to create a chain of parent and child directory you can use with ‘-p’ option. e.g  mkdir -p code/reference, this command will create reference directory under code directory.
• rm
  Deletes the file. If use with -r option, it recursively deletes the file and child directory
• rmdir
  Deletes the empty directory.
• grep
  Looks for the pattern in given file.
• cat
  Prints the content of the file on the console.
• find kill -9
Kills the specified process.

• xcalc
if you are on GNOME; Shows the calculator.
• cal
  Shows the Calendar
• date
  Shows the current date and time

• apt-get moo
  Checkout yourself what it does.
• cowsay ""
  If the command is not found then install it using this command sudo apt-get install cowsay
• alt+f2 "free the fish"
  If you use GNOME. This command doesn’t work if you are using Ubuntu 12.04 or 12.10