Awk Field Seperator Help

Shell Programming and Scripting
1

I wrote a script on HPUX 11.11 to turn a Decimal subnet mask (255.255.254.0) to hex 0xfffffe00 (subset of a bigger script). It works great on the HPUX systems but on the freebsd box the awk is not seperating the fields properly. I tried to google for a solution and seaching these forums i am just hoping someone can help. And if anyone knows how i can add the printf lines directly to the end of the awk statements that would be groovy.

I am unsure of the awk version HPUX uses but the freeBSD version is:
awk version 20050424 (FreeBSD), I would prefer not to use nawk or gawk.

#!/bin/sh

echo "Enter Subnet mask:"
read MASK

OCT1=$(echo $MASK|awk '{FS=".";print $1}')
OCT2=$(echo $MASK|awk '{FS=".";print $2}')
OCT3=$(echo $MASK|awk '{FS=".";print $3}')
OCT4=$(echo $MASK|awk '{FS=".";print $4}')

PHEX1=$(printf "%#x\n" $OCT1)
PHEX2=$(printf "%#x\n" $OCT2|sed 's/0x//')
PHEX3=$(printf "%#x\n" $OCT3|sed 's/0x//')
PHEX4=$(printf "%#x\n" $OCT4|sed 's/0x//')

if [ "$PHEX4" = "0" ]
then
PHEX4=00
fi

PHEXMASK=$(echo $PHEX1$PHEX2$PHEX3$PHEX4)

echo $PHEXMASK

2 
#!/bin/sh

echo "Enter Subnet mask:"
read MASK

oldIFS="${IFS}"
IFS=.

set -- ${MASK}
OCT1=${1}
OCT2=${2}
OCT3=${3}
OCT4=${4}

IFS="${oldIFS}"

PHEX1=$(printf "%#x\n" $OCT1)
PHEX2=$(printf "%#x\n" $OCT2|sed 's/0x//')
PHEX3=$(printf "%#x\n" $OCT3|sed 's/0x//')
PHEX4=$(printf "%#x\n" $OCT4|sed 's/0x//')

if [ "$PHEX4" = "0" ]
then
PHEX4=00
fi

PHEXMASK=$(echo $PHEX1$PHEX2$PHEX3$PHEX4)

echo $PHEXMASK

Cheers
ZB

3

That worked great bob, I did not even think about using the internal seperator. Thank you for your quick help.

4 
awk 'BEGIN{FS="."}{printf "0x%02x%02x%02x%02x\n",$1,$2,$3,$4}'