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Getting information from /etc/group

 
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# 1  
Old 09-15-2003
Getting information from /etc/group
How can I retrieve the group id of an entry in the /etc/group file given the group name?

I tried using cut and grep but cant get around the problem..

I think this problem can be solved using these commands but I dont know how (I am a newbie at this)
# 2  
Old 09-15-2003
Hi Sleepster,

This shows how to do it for a group called dev.

grep dev /etc/group | awk -F: '{print $3}'

Matt.
# 3  
Old 09-15-2003
thanks butterfm..

but what if "dev" appears in some other field in another entry in /etc/group.. say for example there is a member of another group by the name of "dev"

then when the grep command is called it would print out all lines containing the word "dev".. multiple lines in this case?
# 4  
Old 09-15-2003
Good point.

awk -F: '$1 ~ /dev/ {print $3}' /etc/group

Will only print the 3rd column on lines where the 1st column is "dev"

Matt.
# 5  
Old 09-15-2003
What if the group name is stored in a variable.. say $X?

I tried: awk -F: '$1 ~ $X {print $3}' /etc/group... didnt work
the code works fine with /dev/ though
# 6  
Old 09-15-2003
You will need to pass $X into awk using the -v flag as follows

awk -F: -vgrp=$X '$1 ~ grp {print $3}' /etc/group

the awk varaible grp holds the value of $X

Matt.
# 7  
Old 09-15-2003
What OS? Just BTW, some have standard utilities to read the user DB, like pw(8) or group(8).
 
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