06-14-2006
Add string to middle of a file
Hi,
I want to write a script that takes a file and a string as params and adds the string to the middle line of the file. Also, I want to output the results back to the original file passed without using temp files.
I am very much new to UNIX so this is all a little like black magic to me at the moment but heres what I was thinking:
#Get the number of lines in the file
MyVar="`wc -w NewFile | awk '{print $1}'`"
#Get The middle of the file
Middle=$ expr $MyVar / 2
#Add Line to middle of file
????
Here my problems, I think i should be using sed but I am not sure about the syntax.
Another way I thought was to use awk to scan through each line of the file and hold it as an array. Then output the first half of the array to the file, then the input string, then the remaining part of the array. Problem here is that I dont know how to pass a string to an awk script. Is this possible?
Thanks, Chris.
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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)