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Shell Programming and Scripting

How to insert the 1st arg into the middle of the file

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Top Forums Shell Programming and Scripting How to insert the 1st arg into the middle of the file
# 1  
Old 04-11-2007
Network
I wrote a script like
#!/bin/bash
echo $1 > temp
cat $2 >> temp
mv temp $2

now I have problem appending the above script(only using bash shell) so that it now inserts the first argument into the middle of the file.

I have tried using $(('wc -l < file' / 2 ))
but invain so could any one help.
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Last edited by boris; 04-13-2007 at 03:43 PM..
# 2  
Old 04-12-2007
something like this,

to be in the middle
Code:
a=$((`wc -l < filename` / 2))
awk -v var=$a '{ if( NR == var) { print "newline to be added"; print } else { print } }' filename > newf
mv newf filename

# 3  
Old 04-12-2007
Try this

Code:
a=$((`wc -l < filename` / 2))
sed ''$a' a this is new line' filename

# 4  
Old 04-12-2007
when I insert this command and run the sript it give a message stating Syntax error.....is there any other command like head or tail command





Quote:
Originally Posted by jacoden
Try this

Code:
a=$((`wc -l < filename` / 2))
sed ''$a' a this is new line' filename

# 5  
Old 04-13-2007
Quote:
Originally Posted by boris
when I insert this command and run the sript it give a message stating Syntax error.....is there any other command like head or tail command
Code:
sed "${a}a\\
this is new line" filename

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