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What does "-f" option do? This is at the start of a shell scripts to point to full path to the interpreter such as /bin/ksh

What does the -f option do?

#!/bin/ksh -f

ghostdog74 for "while read -r a b c d" what does the -r option do? and what does "a b c d" represent, different input file? different line? different field?

Finally hit the jack pot. again thank you for your contribution which help me move forward along to my destination:

{
if (sub(/DISCOVERY=ON/, "DISCOVERY=OFF"))
print $0
if ( $1 ~ /^#/ ) {
...

Dr.House finally hit the jack pot. again thank you for your contribution which help me move forward along to my destination:

{
if (sub(/DISCOVERY=ON/, "DISCOVERY=OFF"))
print $0
if ( $1 ~ /^#/...

Finally hit the jack pot. again thank you for your contribution which help me move forward along to my destination:

{
if (sub(/DISCOVERY=ON/, "DISCOVERY=OFF"))
print $0
if ( $1 ~ /^#/ ) {
...

scottn, works like a charm, thank you very much. That put the finishing touch to my awk script.

{
if (sub(/DISCOVERY=ON/, "DISCOVERY=OFF"))
print $0
if ( $1 ~ /^#/ ) {
print $0 }
if...

Looking for awk statement that will match all lines starting with "# "

if ( $1 == \^"#" )

Input file:

# of the server. If you would like to set these, please take out the
# pound (#) sign...

n1djs thank you for your valuable input, its help me get further today, seems its one thing after another hoping to hit jack pot soon. Will post when I am done. Again thanks

Franklin52, sidorenko thank you both for your valuable input, it has help me take further today, still no cigar. Will definitely post when I hit jack pot or getting close and need a little more...

What awk command will test a string to determine if it is a valid file name?

With the following awk statement I isolate the lines from the inputfile that might contain a filename, then I attempt...

Usa usa usa !

exactly what I was looking for "proper syntax is such sweet sorrow". Thank you and congrats on Switzerland qualifying for the 2010 world cpu today !!

Does awk have a syntax for a range of numbers or is this the best way?

if ($1 >= 0 && $1 <= 9 )

Dr House thank you, its getting me further. Was not familiar with the shell scripting syntax of the file and directory test. The sed string works just about perfect, however as it strips all numbers...

Thanks Pludi for fixing my post and showing me the ropes.

What is an efficient way to remove all lines from the input file which contain a file name?

inputfile:

=======================
# comment
# comment
# comment

5 8 10 /tmp

5 8 ...