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Old 04-27-2015, 05:24 AM   #1
Red_Templar
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Searching for a specific username


Hey guys,

I've recently started learning Linux, and I was wondering if anyone can tell me how I can search for a specific usernames starting with a certain letter on a Linux system.

For example: How do I get it to display all the usernames starting with a J? (So that it would show me, Jack, Jason, John, etc...)
I tried to find the answer online, but haven't had much luck so far.
 
Old 04-27-2015, 03:29 PM   #2
joe_2000
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Quote:
Originally Posted by Red_Templar View Post
Hey guys,

I've recently started learning Linux, and I was wondering if anyone can tell me how I can search for a specific usernames starting with a certain letter on a Linux system.

For example: How do I get it to display all the usernames starting with a J? (So that it would show me, Jack, Jason, John, etc...)
I tried to find the answer online, but haven't had much luck so far.
All usernames are in /etc/password. So you can grep for lines in that file that start with a j in the following way:
Code:
grep -i ^j /etc/passwd
The -i flag is for the pattern matching to be case insensitive
If you want to only output the actual username, pipe that output into cut:
Code:
grep -i ^j /etc/passwd | cut -d':' -f 1
 
Old 04-27-2015, 03:58 PM   #3
unSpawn
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Quote:
Originally Posted by joe_2000 View Post
If you want to only output the actual username, pipe that output into cut
Or use awk?
Code:
awk -F':' '/^j/ {print $1}' /etc/passwd
 
Old 04-27-2015, 04:22 PM   #4
joe_2000
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Originally Posted by unSpawn View Post
Or use awk?
Code:
awk -F':' '/^j/ {print $1}' /etc/passwd
Don't know why, but for some reason I seem to be bad at remembering the awk syntax. I found that most of times I can get away with pipe and cut.

Maybe I should use awk more often to get better at it. But then, luckily, many ways lead to Rome ;-)
 
Old 04-28-2015, 02:07 AM   #5
Red_Templar
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Thanks guys, both ways worked great!
 
  


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