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Old 12-14-2009, 10:27 PM   #1
wjs1990
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Registered: Nov 2009
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Need help on grep command


Hi all,
For example, i have two similar line "net.ipv4.tcp_syncookies = 1" and "net.ipv4.tcp_syncookies =1". The difference is just that one of them have space between the "=" and "1", and the other one does not have.
Then i used, the command " grep -v "^#" /etc/sysctl.conf | grep -w net.ipv4.tcp_syncookies | awk -F= '{print $2}' ". The results i get will be " 1" and "1" for the two lines respectively.
So, does anyone have any idea on how can i get the result "1" for both lines, using the same command.

Thanks
 
Old 12-14-2009, 10:35 PM   #2
ghostdog74
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just one awk command will do
Code:
awk -F'= ' '!/^#/&&/net.*ipv4.*tcp_syncookies/{print $2}' /etc/sysctl.conf
or using the shell
Code:
while read -r line
do
    case "$line" in
       net.ipv4.tcp_syncookies*)
       IFS="="
       set -- $line
       echo ${2// }
    esac
done <"/etc/sysctl.conf"

Last edited by ghostdog74; 12-14-2009 at 11:59 PM.
 
Old 12-14-2009, 10:59 PM   #3
syg00
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Code:
sed -nr 's:(net.ipv[^=]*=)(.*):\2:p' /etc/sysctl.conf
 
  


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