Shell Programming and Scripting

0x10=some text
0x20=some text
0x30=some text

16=some text
32=some text
48=some text

 $ echo $((0x15a))

 $ printf '%d\n' 0x15a

sed 's/^.\{4\}/'"`echo $((&))`"'/' inputfile

sed 's/0x//' input | { IFS="=" ; while read a b
do
      n=`echo "obase=10;ibase=16;$a"|bc`
      echo "$n=$b"
done }

$ cat input
0x10=some text
0x20=some text 
0x30=some text
$ cat mts
sed 's/0x//' input | { IFS="=" ; while read a b
do
      n=`echo "obase=10;ibase=16;$a"|bc`
      echo "$n=$b"
done }
$ ksh mts
16=some text
32=some text
48=some text
$

while IFS="=" read HEX TEXT
do
        echo "$((${HEX}))=${TEXT}"
done < input > output

 sed 's/^.\{4\}/'"`date`"'/' inputfile

Wed Nov 17 22:21:40 CET 2010=some text
Wed Nov 17 22:21:40 CET 2010=some text
Wed Nov 17 22:21:40 CET 2010=some text

while IFS="=" read hex rest
do
    printf "%d=%s\n" hex rest
done < infile

 sed 's/^.\{4\}/'"`date`"'/' inputfile

sed 's/^.\{4\}/'"Wed Nov 17 22:21:40 CET 2010"'/' inputfile

$
$
$ cat f40
0x10=some text
0x20=some text
0x30=some text
$
$
$ perl -ne '/^(.*?)(=.*)$/ && printf("%s%s\n",hex($1),$2)' f40
16=some text
32=some text
48=some text
$
$