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loop through logged on users or file?

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# 8  
Old 06-19-2006
Quote:
Originally Posted by vgersh99
why do you have both 'grep' and 'awk AND why do you have 'FS' inside the curly braces??'
Why use awk or grep at all?
Code:
#! /bin/ksh
oldifs="$IFS"; IFS=:
 while read _user _ _ _ _realname _; do
  print $_user - $_realname
 done </etc/passwd
IFS="$oldifs"; unset oldifs

It's faster too...
# 9  
Old 06-19-2006
it may be faster but it doesn't adress the question posed in the original question. The question asked was the list the full names of logged in users, not all users.
# 10  
Old 06-19-2006
Quote:
Originally Posted by reborg
it may be faster but it doesn't adress the question posed in the original question. The question asked was the list the full names of logged in users, not all users.
Do'h...
Well, it's not pretty, and won't work if the user field in "who" truncates long user names (as is the case on at least one system I work with,) but should be more or less portable between ksh, bash, and other modern POSIX shells:
Code:
#! /bin/ksh

# Build name->GECOS vars
oldifs="$IFS"; IFS=:
while read _user _ _ _ _realname _; do
 eval lookup_${_user}=\"$_realname\"
done </etc/passwd
IFS="$oldifs"; unset oldifs

# Loop through $(who)
who -s | while read _whoname _ ; do
 eval echo \$lookup_${_whoname} is online
done

You may get trickier with perl or ksh93, but this works in most cases.
# 11  
Old 06-20-2006
Hi,

Did you check whether those username are present in /etc/passwd ?
# 12  
Old 06-20-2006
Quote:
Originally Posted by macosta
Do'h...
Well, it's not pretty, and won't work if the user field in "who" truncates long user names (as is the case on at least one system I work with,) but should be more or less portable between ksh, bash, and other modern POSIX shells:
Code:
#! /bin/ksh

# Build name->GECOS vars
oldifs="$IFS"; IFS=:
while read _user _ _ _ _realname _; do
 eval lookup_${_user}=\"$_realname\"
done </etc/passwd
IFS="$oldifs"; unset oldifs

# Loop through $(who)
who -s | while read _whoname _ ; do
 eval echo \$lookup_${_whoname} is online
done

You may get trickier with perl or ksh93, but this works in most cases.
this's an overkill.
Try this paradigm:

Code:
#! /bin/ksh

# Build name->GECOS vars
while IFS=: read _user _ _ _ _realname _; do
 eval lookup_${_user}=\"$_realname\"
done </etc/passwd

# 13  
Old 06-20-2006
Quote:
Originally Posted by acp
Hi,

Did you check whether those username are present in /etc/passwd ?
Mine doesn't take that into account, so if you're using, say LDAP, you'll need to gather the names another way.
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