awk

Ø  Syntax

awk options `selection criteria {action}` filename

Ø  Cat data.txt

ü  There are two servers:HP:IBM

Ø  awk –F: `/server/ {printf $5 $ 6}` data.txt

ü  HP:IBM

Ø  awk `/server/{printf $6}` data.txt

ü  IBM

Ø  Comparison operator

ü  awk ‘$2 == “director” || $3 == “chairman” {printf “%-20s %-20s \n”, $2, $3}’ datafile

Ø  awk `$2~/100/` test.txt

Ø  awk `$2 !~ /100/` test.txt

Ø  Number comparison

ü  awk `$2>200` test.txt

ü  awk `$2^200` test.txt  ---shows data which equal or above 200

Ø  awk –F: `$3 == 0 && $1 != “root”` /etc/passwd