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Full Discussion: Redirect output to the same input file in awk
Top Forums UNIX for Dummies Questions & Answers Redirect output to the same input file in awk Post 302936364 by stew on Wednesday 25th of February 2015 04:01:22 AM
Old 02-25-2015
Anbu - your work for single line below is my actual i/p and o/p file

Code:
kernel.sem = 250   32000   32      128250
kernel.small = 1612364
kernel.shmmax = 2147483648

when I run
Code:
awk '/kernel.sem/ { if ($3 < "300") { sub($3,"300",$0); print > "/tmp/test" } }' /tmp/test

the entire file is replaced like below
Code:
kernel.sem = 300   32000   32      128250

my actual o/p file should be

Code:
kernel.sem = 300   32000   32      128250
kernel.small = 1612364
kernel.shmmax = 2147483648

if I run
Code:
awk '/kernel.sem/ {print $3,$6}' /tmp/test

, it prints
Code:
300 128250

correctly
 

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LEARN ABOUT LINUX

igawk

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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