txtdir.net script for adding friends links

addfriend.sh

#! /bin/sh

usage="Usage: addfriend friend1 [friend2 ...]"
friendsdir=$HOME/public/friends

if [ ! -d $friendsdir ]
then
    echo "Making friends directory..."
    mkdir -pv $friendsdir
fi

if [ $# > 0 ]
then
    echo "Linking friends..."
    for friend in $@
    do
        if [ $(id -un $friend) ]
        then
            ln -shv $WORLD/$friend $friendsdir/$friend
        fi
    done
else
    echo $usage
    exit 1
fi