SHELL COMMANDS

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SHELL

WHAT IS SHELL?

THE INTERFACE THAT ACCEPTS USER INPUT AND PRODUCES OUTPUT IS CALLED SHELL

SHELL IS AN INDEPENDENT PROGRAM OF THE UNDERLYING OS (UNIX OR LINUX)

ANOTHER SHELL NAME:- SH

SH IS NAME WAS BOURNE SHELL

CREATOR NAME "STEVE BOURNE"

TYPE OF SHELL

1.BASH SHELL

2.ASH SHELL

3.KORN SHELL (PROGRAMMING)

4.TCSH SHELL (C,C++ PROGRAMMING)

5.ZSH SHELL

BASH WORKING IN TWO MODE

1.INTERACTIVE MODE (WRITEING COMANDS DIRECTLY TO THE SHELL)

2.PROGRAMMING MODE (WRITING SHELL SCRIPTS)

HOW TO RUN SCRIPTS FILES IN LINUX

STEP :-1

nano "filename.extension"

scripts file extension .sh

ex:- nano test.sh

open your shell test editor

type your scripts

example scripts:-

" ls

echo listing files "

SAVE COMMANDSl :- CNTRL+ O << enter

EXIT THE SHELL EDITOR :- CNTRL + X

THIS TEST.SH FILES IS NORMAL FILE IS NOT A EXECUTABLE FILE

FIRST CHAGE THE EXECUTABLE FILE

TYPE:- "

chmod +x"filename.sh " << enter

next run the scripts file

Type:-

"./"fiename.sh"

First learn next earn :)