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Using grep with 'who' to find online users

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# 1  
Old 01-07-2012
Using grep with 'who' to find online users
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Last edited by subway69; 01-09-2012 at 02:23 PM..
# 2  
Old 01-07-2012
Code:
who | grep -w ^$user >/dev/null 2>&1
if [ $? -eq 0 ]
then
  echo "$user is online"
else
  echo "$user not online"
fi

if your grep supports -q option, use it like this who | grep -qw "^$user"

--ahamed
This User Gave Thanks to ahamed101 For This Post:
subway69
# 3  
Old 01-07-2012
even more streamlined.

Code:
if who|grep -qw ^$user >/dev/null 2>&1
then
  echo "$user is online"
else
  echo "$user not online"
fi

or the one line version.

Code:
who|grep -qw ^$user && echo "$user online" || echo "$user not online"

Last edited by frank_rizzo; 01-07-2012 at 02:11 PM.. Reason: added one line
This User Gave Thanks to frank_rizzo For This Post:
subway69
# 4  
Old 01-07-2012
gah I should have known to pipe grep I completely forgot

still learning. . .

thanks guysSmilie
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