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Top Forums UNIX for Dummies Questions & Answers how do I insert argument into TOP of file using vi? Post 302129534 by zazzybob on Tuesday 31st of July 2007 11:22:10 AM
Old 07-31-2007
OK, sed's insert command would be hassle here, so awk is probably easiest. "line_file" is your input filename.

Code:
# get midway point - will be a floored integer
$ line_num=$(( $( wc -l < line_file ) / 2 ))
# insert text after that line
$ awk '{if ( NR=='"${line_num}"' ) {printf("%s\n%s\n",$0,"insert this");} else {print}}' line_file > line_file.new && mv line_file.new line_file

Cheers,
ZB
 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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