changing the speed of a chozen network interface without a need fro reboot

#!/bin/ksh
##########################################################################
# Updated on 18/11/04
# Version 1.1
# This script enables changing the speed of a chozen network interface without a need for reboot
# The script displays a list of the existing ent interfaces with their current speed and IP setting .
# Once you choose the interfaces,you then choose the desired speed.
# WARNING: THIS OPERATION WILL CUT OFF ANY APPLETALK/NFS/TCPIP CONNECTIVITY FOR SEVERAL SECONDS !
# Note: 1.If you are changing the speed of the default interface - you telnet communication will be cut off for a several
# seconds then it will restore back.
# 2. If you work remotely ,then choose the default interface and change it's speed to the one which is not
# supported by your swith - the script may stick and leave you with a disabled network.Then you have to change the
# interface settings localy on your machine
# usage : chent.sh
#####################################################################
CHENT="/scitex/version/scripts/CHENT.sh"
export LOG="/tmp/chent.log"
MYTERM1=`who -m|awk '{ print \$2 }'`
export MYTERM=/dev/$MYTERM1

#collect all ENTs info into file
for ENT in `lsdev -Cs pci|grep ent | awk '{ print $1 }'`;do
EN=`echo $ENT|cut -c 1,2,4`
mktcpip -S $EN 2>&1|grep -v host|awk -F: '{ printf ("%-4s %-15s %-15s %-12s %-12s ",$4,$2,$3,$5,$7 )}'
SPEED=`lsattr -El $ENT | grep -i media_ | awk '{ print $2 }'`
if [[ -z $SPEED ]] ;then
printf "%-18s" ""
else
printf "%-18s" "$SPEED"
fi
lsdev -Cspci | grep $ENT|awk '{print $4,$5}'
done > /tmp/EN

COUNT=`wc -l /tmp/EN|awk '{ print $1 }'`
integer A=1
oldIFS=$IFS #change field separator to "end-of-line"
IFS='\n'
while (( $A <= $COUNT )) ;do #fill up the array from the file
INTERFACE[A]=`head -n $A /tmp/EN|tail -1`
A=$A+1
done
A=$A-1

echo "---------------------------------------------------"
IFS='!' #change field separator to non-existing one just for "select"
echo "\nWARNING: THIS OPERATION WILL CUTT OFF ANY /NFS/TCPIP CONNECTIVITY FOR SEVERALL SECONDS !\n"
echo "---------------------------------------------------"
echo "Select the destination interface : \n"
printf "%-2s %-4s %-15s %-15s %-12s %-11s %-17s %-20s\n" " " "Int" "IP_address" "Mask" "DNS" "Gateway" "Speed" "Type"
printf "%-2s %-4s %-15s %-15s %-12s %-12s %-17s %-20s\n" " " "---" "----------" "----" "---" "-------" "--------" "----------"

#Select the INTERFACE
PS3="choose the interface >>"
select DEST_INTERFACE in ${INTERFACE[*]}
do
if [[ -z $DEST_INTERFACE ]]
then
printf -- "Choose the right number \n\n"
else
break
fi
done

IFS=$oldIFS #change field separator back to default !
FINAL_INT=`echo $DEST_INTERFACE|awk '{print $1}'|cut -c 3`

#Get the specific boards options
if lsdev -Cspci | grep ent$FINAL_INT |grep 3Com >/dev/null ;then
DEVICE="3C905"
ATTRIBUTE="media_type"
else
DEVICE=`lsdev -Cspci | grep ent$FINAL_INT | awk -F "(" '{print $2 }'|tr -d ")"`
ATTRIBUTE="media_speed"
fi

#Select the speed
odmget -q uniquetype="adapter/pci/$DEVICE" PdAt|grep media_ >/dev/null #Check if this interface is configurable
if [[ $? != 0 ]] ; then
echo "\nThis interface speed can not be changed !\n"
exit
fi

echo "\nSelect the required new speed :\n"
PS3="choose speed>>"
select SPEED_SET in `odmget -q uniquetype="adapter/pci/$DEVICE" PdAt | grep -p media_ | awk -F \" '/values/ {print $2}' | tr , ' ' ` Exit ;do
if [[ -z $SPEED_SET ]] ;then
printf -- "Choose the right number \n\n"
elif [[ $SPEED_SET = "Exit" ]] ;then
exit
else
break
fi
done

echo "\nThis operation may take severall minutes ..."
echo "Now unmounting all NFS mounts ..."
umount allr >/dev/null 2>&1
echo "Now stopping tcpip ..."
stopsrc -g tcpip >/dev/null 2>&1

#Now create a background script
echo '#!/bin/ksh' > $CHENT
echo "chdev -l en$FINAL_INT -a state='down' > \$LOG 2>&1" >> $CHENT

echo "chdev -l en$FINAL_INT -a state='detach' >> \$LOG 2>&1" >> $CHENT
echo "chdev -l ent$FINAL_INT -a $ATTRIBUTE=$SPEED_SET 2>&1 >\$MYTERM |tee -a \$LOG" >> $CHENT
echo "echo \$? >> \$LOG" >> $CHENT
echo "if [[ \$? != 0 ]] ;then " >> $CHENT
echo "echo \"Failed to change the required speed !\" >\$MYTERM" >> $CHENT
echo "exit 1" >> $CHENT
echo "fi" >> $CHENT
echo "chdev -l en$FINAL_INT -a state=up >> \$LOG 2>&1" >> $CHENT
echo "Now restarting tcpip and atalk ..." >> $CHENT
echo "mkdev -l inet0 >> \$LOG 2>&1" >> $CHENT
echo "sleep 1" >> $CHENT
echo "startsrc -g tcpip >> \$LOG 2>&1" >> $CHENT


chmod 777 $CHENT
nohup $CHENT >$MYTERM 2>/dev/null

echo "The new speed is \c"
lsattr -El ent$FINAL_INT | grep -i media_| awk '{ print $2 }'
echo " "