Shell Scripting

Shell Scripting She-bang

The sign #! is called she-bang and is written at top of the script. It passes instruction to program /bin/sh.

To run your script in a certain shell (shell should be supported by your system), start your script with #! followed by the shell name.

#!/bin/bash

# My first script

echo "Hello World!"

=========================

script 2:- 

#! /bin/bash

echo "Hello $USER"

echo "Hey i am" $USER "and will be telling you about the current processes"

echo "Running processes List"

ps

output:-

Hello 

Hey i am and will be telling you about the current processes

Running processes List

  PID TTY          TIME CMD

    1 ?        00:00:00 timeout

    7 ?        00:00:00 bash

    8 ?        00:00:00 time

   14 ?        00:00:00 bash

   15 ?        00:00:00 ps

=================================================

script 3:-

#! /bin/bash

echo "Hey what's Your First Name?";

read a;

echo "welcome Mr./Mrs. $a, would you like to tell us, Your Last Name";

read b;

echo "Thanks Mr./Mrs. $a $b for telling us your name";

echo "*******************"

echo "Mr./Mrs. $b, it's time to say you good bye"

output:-

Hey what's Your First Name?

welcome Mr./Mrs. Krishna, would you like to tell us, Your Last Name

Thanks Mr./Mrs. Krishna Karra for telling us your name

*******************

Mr./Mrs. Karra, it's time to say you good bye

jdoodle.sh: line 2: $'\r': command not found

jdoodle.sh: line 3: $'\r': command not found

jdoodle.sh: line 4: $'\r': command not found

jdoodle.sh: line 5: $'\r': command not found

jdoodle.sh: line 6: $'\r': command not found

=============================================

sript 4:-