Shell Programming and Scripting

file:
1|12322|tow|
5|23422|pow|
6|23423|cow|
3|34324|how|

deletelines:
12322
23423

while read NUM 
do 
awk -F"\|"  '$2 !~ /`"$NUM"`/' file >file.back 
mv file.back file 
done<deletelines

awk -F"\|" -vNM=$NUM "\$2 !~ NM" file

awk -F"\|"  'NR==FNR {T[$1]; next} $2 in T {next} 1' deletelines  file
5|23422|pow|
3|34324|how|

awk -F\| 'NR==FNR{A[$1];next}!($2 in A)' deletelines file > file.back