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Shell Programming and Scripting

line operation in a file

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# 1  
Old 05-26-2008
line operation in a file
Hello all,

I have just started fidling with script. Can anyone please help me out with this question. I have a file that contains the below 4 lines of words

Abcd
Efgh
Ijkl
Mnop

The question is I want to add a line to the middle of these without using sed or awk. Can anyone bail me out please?
# 2  
Old 05-26-2008
Hi,

This is the sample script.

U can edit as per ur requirement.

:>tmp2
echo "Enter the where you want to put new line:"
read line_no
echo "Enter the line you want to append to this file:"
read new_str
var=`cat tmp | wc -l`
i=1
while [ $i -lt $var ]
do
str=`head -$i tmp|tail -1`
if [ $i = $line_no ]
then
echo $new_str >> tmp2
fi
echo $str >> tmp2
i=`expr $i + 1`
done


Regards,
Siba
# 3  
Old 05-26-2008
Quote:
Originally Posted by Musaroro
The question is I want to add a line to the middle of these without using sed or awk.
Is this a homework question?

Regards
# 4  
Old 05-26-2008
Thank you but could you please explain what the head and tail does in the script as I really want to understand rather than assume!!
# 5  
Old 05-26-2008
Have you read the man pages?

Regards
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