Redirection of Standard output/input

• Mostly all commands give output on screen or take input from keyboard, but it's also possible to send output to file or to read input from file.
• There are three main redirection symbols $>,>>,<$
  1. $>$ Redirector Symbol. Syntax:
     Linux-command $>$ filename
     To output Linux-commands result (output of command or shell script) to file. Note that if file already exist, it will be overwritten else new file is created.

     $ ls > myfiles
     

  2. $>>$ Redirector Symbol. Syntax:
     Linux-command $>>$ filename
     To output Linux-commands result (output of command or shell script) to END of file. Note that if file exist , it will be opened and new information/data will be written to END of file, without losing previous information/data, And if file is not exist, then new file is created.

     $ date >> myfiles
     

  3. $<$ Redirector Symbol. Syntax:
     Linux-command $<$ filename
     To take input to Linux-command from file instead of keyboard.

     $ cat < myfiles