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#the code is
x=0
while read -r var
do
filename[ $x ]=$var
x=`expr $x + 1`
done < file
y=0
while [ $y -le $x ]
do
echo $filename[ $y ]
y= `expr $y + 1`
done

thanks for the reply.
i don't have -i option with sed.
and the last command given by u also does n't work.
even i had tried with that command first and then i wrote
a different script for...

after replacing a string by sed in a file if i want to save the
changes is it necessary to write an overwritting shell script

I want to know if there is any special command using which
i can...