awk Post: 302128114

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Top Forums Shell Programming and Scripting awk Post 302128114 by Ashvin Gaur on Sunday 22nd of July 2007 06:39:04 AM

07-22-2007

Registered User

I had your output in the file gAshvin as follows

/dev/cciss/c0d0p10 2.0G 236M 1.6G 13% /
/dev/cciss/c0d0p1 985M 33M 903M 4% /boot
/dev/cciss/c0d0p3 9.7G 363M 8.8G 4% /files/BACKUP
/dev/cciss/c0d0p11 985M 18M 917M 2% /home
/dev/cciss/c0d0p5 9.7G 3.5G 5.8G 38% /opt none 3.0G 0 3.0G 0% /dev/shm
/dev/cciss/c0d0p2 15G 4.5G 9.3G 33% /product
/dev/cciss/c0d0p9 3.9G 33M 3.7G 1% /tmp
/dev/cciss/c0d0p7 5.8G 2.7G 2.9G 49% /usr
/dev/cciss/c0d0p8 4.9G 458M 4.2G 10% /var
/dev/vg_database/lv_database 345G 255G 73G 78% /database
/dev/vg_database/lv_oradata6 40G 35M 38G 1% /database/oradata6
/dev/vg_database/lv_oradata7 9.7G 33M 9.2G 1% /database/oradata7
/dev/vg_database/lv_backup 177G 2.1G 166G 2% /database/backup

$ awk -v limit=70 'NR>0 && int($5) >=limit' gAshvin
/dev/vg_database/lv_database 345G 255G 73G 78% /database

I assume that you might have broken the line and the awk encountered the line as 2 seperate lines and you missed the correct output.

I tested this scenario on my test machine as follows

$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
71G 3.8G 63G 6% /
/dev/sda1 99M 16M 78M 18% /boot
tmpfs 500M 0 500M 0% /dev/shm
/dev/hda 681M 681M 0 100% /media/ashvin

$ df -h | awk -v limit=18 'NR>0 && int($5) >=limit'
/dev/sda1 99M 16M 78M 18% /boot
/dev/hda 681M 681M 0 100% /media/ashvin

Please do double check the df -h output in your case

On my machine result, If I change the clause "limit=18" by " limit=5", The output does not display the line
/dev/mapper/VolGroup00-LogVol00 71G 3.8G 63G 6% /
in output. This is because the new line character by df -h is treated as EOR by awk and hence the test condition 'NR>0 && int($5) >=limit' fails for this line ( which is infact treated 2 seperate records by awk)
Hope this explains your failes output.
Try to redirect the df -h output in a file, verify the file and then use awk over the file.

Last edited by Ashvin Gaur; 07-22-2007 at 07:54 AM.. Reason: updated with example

Ashvin Gaur

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LEARN ABOUT CENTOS

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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