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Adding lines to file through a shell script

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# 1  
Old 02-26-2009
Adding lines to file through a shell script
Hi, I'm pretty new to the whole scripting thing. I've gotten a decent hang of it so far but am wondering if there's a way to add lines to a C, C++, Java, HTML, text file with a shell script.

Any help would be greatly appreciated. Smilie
# 2  
Old 02-26-2009
Quote:
Originally Posted by Doctor Manhatta
Hi, I'm pretty new to the whole scripting thing. I've gotten a decent hang of it so far but am wondering if there's a way to add lines to a C, C++, Java, HTML, text file with a shell script.
Yes.
Quote:
Any help would be greatly appreciated. Smilie
If you want more help, you'll have to be more specific.
# 3  
Old 02-26-2009
Alright, sorry about that.

As an example, if I had a C file called "number.c" and wanted to add in the lines

Code:
for( i = 0 ; i < 20 ; i++)
{
       scanf("%d",&array[i]);
}

to a specific line in the C file, how would that look in a shell script?
Last edited by Doctor Manhatta; 02-26-2009 at 01:46 AM..
# 4  
Old 02-26-2009
Quote:
Originally Posted by Doctor Manhatta
Alright, sorry about that.

As an example, if I had a C file called "number.c" and wanted to add in the lines

Code:
for( i = 0 ; i < 20 ; i++)
{
scanf("%d",&array[i]);
}

to a specific line in the C file, how would that look in a shell script?
Code:
insert="for( i = 0 ; i < 20 ; i++)
{
scanf("%d",&array[i]);
}"

awk -v insert="$insert" '
 {print}
 SELECTOR { print insert }
' "$FILE" > tempfile && mv tempfile "$FILE"

SELECTOR is a pattern that matches the line in the file where you want to insert the new lines.

It could be NR == 10 if you want to insert after line 10.

Or /INSERT HERE/ to insert after a line containing "INSERT HERE".
# 5  
Old 02-26-2009
Thank you very much! Smilie
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