Grep text in awk after pattern

unclesamcrazy · 03-11-2016, 09:29 AM

I am trying to execute following command but I am not able to do it.

Code:

awk -F: '{ system("passwd -S " $1)}' /etc/passwd | grep LK

I want to list all Locked account but not using grep after awk.

Please help me to achieve this using same awk command.

I have tried

Code:

awk -F: '{ system("passwd -S " $1)/LK/}' /etc/passwd
awk -F: '{ system("passwd -S " $1)}/LK/' /etc/passwd
awk -F: '/LK/{ system("passwd -S " $1)}' /etc/passwd
awk -F: '{ system("passwd -S " $1)($1 == "LK")}{print $1}' /etc/passwd

Please help.

hydrurga · 03-11-2016, 10:12 AM

Can I ask why are you using the separation character ':'?

On my system, the columns generated by passwd -S appear to be space-separated.

(I have other questions as well, but thought we'd start with that one

)

cliffordw · 03-11-2016, 10:22 AM

Hi there,

Try this:

Code:

awk -F: '{ "passwd -S " $1 | getline status; split(status,sf," "); if (sf[2] == "LK") print sf[1];}' /etc/passwd

The "getline" reads the output from the "passwd -S" command into the "status" variable, and split() separates the line into fields ("sf").

With recent versions of "passwd" you can show the status of all accounts in one go, making this possible:

Code:

passwd -S -a | awk '/ LK / {print $1}

cliffordw · 03-11-2016, 10:23 AM

Quote:

Originally Posted by hydrurga

Can I ask why are you using the separation character ':'?

On my system, the columns generated by passwd -S appear to be space-separated.

The separator is for parsing /etc/passwd, not "passwd -S" ;-)

hydrurga · 03-11-2016, 10:29 AM

Quote:

Originally Posted by cliffordw

The separator is for parsing /etc/passwd, not "passwd -S" ;-)

:-) Ok.

So, why doesn't

Code:

passwd -S -a | awk -F" " '$2 ~ /L/'

do the trick to achieve OP's intention to list accounts with locked passwords. Obviously I'm not understanding something here.

Edit: I've used L instead of LK because man passwd on my system indicates that only this letter indicates a locked password.

cliffordw · 03-11-2016, 11:34 AM

Hi hydrurga,

I think it depends on your version of "passwd". On my openSUSE Tumbelweed laptop your command works ("-a" option is present, and output shows "L" only). On al older Centos 6 server I found that "-a" doesn't exist, and output shows "LK" as per unclesamcrazy's original post.

hydrurga · 03-11-2016, 11:38 AM

Quote:

Originally Posted by cliffordw

Hi hydrurga,

I think it depends on your version of "passwd". On my openSUSE Tumbelweed laptop your command works ("-a" option is present, and output shows "L" only). On al older Centos 6 server I found that "-a" doesn't exist, and output shows "LK" as per unclesamcrazy's original post.

Ah ok, hence the reason for having to access /etc/passwd. Thanks for explaining! (and so much for standardisation of the essentials

)