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Shell Programming and Scripting

adding data behind a line

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# 1  
Old 08-01-2008
adding data behind a line
Hi,

I need to search for the line with the particular group name and add the user into the group. The file format is the same as /etc/group
The code i wrote is
egrep "^$newGID" $group >/dev/null

FS=":"
oldData=awk -F: '{print $3}'
newData= "$oldData,$newUser"
sed -n $4/$newData $group

but a friend told me that sed doesnt seem to have FS function. Could anybody please help me out??
# 2  
Old 08-01-2008
Code:
user=userX
group=whatever
sed "/^$group:/ s/$/,$user/" /etc/group

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