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Hello Indira_s,

one more approach for same.



while read line
do
value=`echo $line | awk -F":" '{print $2}'` ### taking the second column for a1 file ###
check_value_other_file=`cat...

$ awk -F":" 'FNR==NR{A[$2];next}!($2 in A){print $0, "is not there"}' file2 file1-F":" --> Field separator is set to :

FNR == NR

FNR variable--> Current line number in the current file
...

Codetags please

$ cat file1
a1:1
a1:2
a1:3
a1:4
a1:5
a1:6
a1:7
a1:8
a1:9
a1:10$ cat file2
a2:1
a2:3
a2:4
a2:6
a2:8
a2:2
a2:5

Try reading from your mailid.txt line by line, adding each entry read to the MAIL_DBA variable, finally removing the leading comma:$ while read; do MAIL_DBA=$MAIL_DBA,$REPLY ; done < mailid.txt;...

Or use paste command:
MAIL_DBA=$( paste -s -d"," /home/abc/mailid.txt )

I like this ( if gawk is avaliable ):
gawk 'match($0,/:[[:space:]]+([[:digit:]]+)[[:space:]]+Kbytes/,e){print e[1]}'

Replace existing awk program with:
awk '{ gsub(/.*: |Kbytes.*/,x); print } '
OR
awk '{ gsub(/.*: |Kbytes.*/,x) } 1'
OR
awk '{ gsub(/.*: |[a-zA-Z]*/,x) } 1'

awk '{print $(NF-2)}'