Shell Scripts for beginners

Sample 1 :Interactive Shell scripts

#SS1

#Usage : SS1

# An Interactive Shell Scripts

echo What is Your name\?

read name

echo Hello $name. Happy Programming.

Instructions : Type the same in an Notepad and save the file with the extension (.sh)

./SS1

SS1:execute permission Denied (By default every file gets created with the permission 666 i.e., rw-rw-rw-).

the next thing that we got to do is

$umask

0022 ( with this we can read and write the file but we can execute it)

$ chmod 744 SS1(with this option we get the read,write,execute option open up for our file).

Sample 2 : Arithmetic in Shell Scripts

#SS2

#Usage : SS2

#Example of Arithmetic Operations

a=20 b=10

echo ‘expr $a + $b’

echo ‘expr $a - $b’

echo ‘exp $a * $b’

echo ‘expr $a /$b’

on execution of this shell scripts we get the following output :

30

10

200

2

Sample 3 :  if – then –else – fi  statement

#SS3

#usage : SS3

Enter the Source and target file names

read source target

if cp $ source $ target

then

echo file copied successfully

else

echo failed to copy the file

fi

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