Shell Programming and Scripting

$ cat my.txt
AA:22:note:AA
BB:AA:help:XX
CC:14:AA:CC
ZZ:AA:hello:AA

A) <searching "AA" as 2nd field in all lines of my.txt >
$ awk -F ":" '{ if ($2 ~ /AA/) print "found in line - " NR; else print "Not found"}' my.txt
Not found
found in line - 2
Not found
found in line - 4

B) <"XX" is not present as 2nd field in my.txt>
$ awk -F ":" '{ if ($2 ~ /XX/) print "found in line - " NR; else print "Not found"}' my.txt
Not found
Not found
Not found
Not found

found in line - 2
found in line - 4

Not found

awk -F ":" '$2 ~ /AA/ {print "found in line - " NR}' my.txt

awk -F ":" '$2 ~ /XX/{f=1} END{if(!f){print "Not found"}}' my.txt

$ awk -F ":" '$2 ~ /XX/{f=1} END{if(!f){print "not found"} else {print "found in line : " NR}}' my.txt
not found

$ awk -F ":" '$2 ~ /AA/{f=1} END{if(!f){print "not found"} else {print "found in line : " NR}}' my.txt
found in line : 4

awk -F":" '$2~/AA/{print ..... }
$2 !~ /XX/ {print "..." } ' file

awk -F ":" '$2 ~ /AA/ {print "found in line - " NR;next}{print "NOT found in line - " NR}' my.txt

awk 'END { if (!x) print "not found" }
$2 == "AA" { print "found in line:", NR; x++ }
' FS=":" file