function of each line of following script :--

1) The following shell script illustrates the use of the read and echo commands. Enter it using vi the file should be named mycat. Set the appropriate permissions and test it. Using man pages, Google, your textbook, and class handouts comment each line of the script provided below to explain how the script functions.

! /bin/sh -f

read s

while [ -n "$s" ]

do

echo $s

read s

done

2) The following shell script is used to demonstrate how a script can be written that is able to interact with a user. Enter it using vi the file should be named mydialog. Set the appropriate permissions and test it. Using man pages, Google, your textbook, and class handouts comment each line of the script provided below to explain how the script functions.

#! /bin/sh

echo -n "Enter you name (first last): "

read first last

echo "Data read:" $first $last

cat << ENDDATA

Hi, $first ${last}.

Mr. $last, bye-bye!

ENDDATA

3) The following script can be used to create users. Using man pages, Google, your textbook, and class handouts comment each line of the script provided below to explain how the script functions. There is no need to run this script.

#! /bin/sh -fx

read username

while [ -n "$username" ]

do

name=`echo $username | awk '{print $1}'`

useradd -m -g users -d /home/users/$name -s /bin/bash $name

passwd $name

read username

done

4) The following script can be used to delete users. Set the appropriate permissions and test it. Using man pages, Google, your textbook, and in class handouts comment

each line of the script provided below to explain how the script functions. There is no need to run this script.

#!/bin/bash

read username

while [ -n "$username" ]

do

name=`echo $username | awk '{print $1}'`

userdel -r $name

read username

done

5) This shell script demonstrates the use of the shift instruction. Enter it using vi the file should be named myargs. Set the appropriate permissions and test it. . Using man pages, Google, your textbook, and class handouts comment each line of the script provided below to explain how the script functions.

! /bin/sh -x

echo $#: $@

set abc def ghi

while [ $# -gt 0 ]

do

echo $#: $@

shift

done

6) The following shell script is used to demonstrate how a script can be written that uses procedures called by a driver section of the script. Enter it using vi the file should be named myproc. Set the appropriate permissions and test it. Using man pages, Google, your textbook, and class handouts comment each line of the script provided below to explain how the script functions.

main()

{

proc1()

{

echo ... In proc

return 0

}

echo Calling proc

proc1

echo Back to caller

return 0

}

main