experimental system info gathering script

#!/bin/sh
# script exercise
#
#  1) hostname (hint: hostname or uname)
#  2) IP Address (hint: ifconfig)
#  3) subnet mask (hint: ifconfig/grep/awk)
#  4) list passwd (hint: cat)
#  5) version of the OS (hint: uname)
#
#  add line between each entry "-------------------------------------------"
#  OUTPUT FILE called:  /tmp/sysinfo.txt
#
#  author:  john    date:  Apr 2, 2004
########################################################################
#   define variables - change command paths as needed for OS version
FILE=/tmp/sysinfo.txt
HOST=/bin/hostname
IFCFG=/sbin/ifconfig
GREP=/bin/grep
AWK=/bin/awk
SED=/bin/sed
CAT=/bin/cat
UNAME="/bin/uname -a"
########################################################################

#   begin script

$CAT /dev/null > $FILE

#  1 hostname

echo "hostname" >> $FILE
$HOST >> $FILE
echo "-------------------------------------------" >> $FILE

#  2  ip address

echo "ip address" >> $FILE
$IFCFG | $GREP inet | $GREP -v 127 | $AWK '{print $2}' | $SED 's/addr:/ /g' >> $FILE
echo "-------------------------------------------" >> $FILE

#  3  subnet mask

echo "subnet mask" >> $FILE
$IFCFG | $GREP Mask | $AWK '{print $4}' | $SED 's/Mask:/ /g' >> $FILE
echo "-------------------------------------------" >> $FILE

#  4  passwd

echo "/etc/passwd" >> $FILE
$CAT /etc/passwd >> $FILE
echo "-------------------------------------------" >> $FILE

#  5  OS version

echo "OS version" >> $FILE
# command line:   uname -a  | awk '{print $3}'
$UNAME | $AWK '{print $3}' >> $FILE
echo "-------------------------------------------" >> $FILE