How can i convert my Hex value to Dec value using pipe after sed.
Conversion from 'litte endian' to 'big endian'
dec_value=`echo dede0a01 | sed 's,\(..\)\(..\)\(..\)\(..\),\4\3\2\1,g'`
views:
48answers:
5
A:
bc accepts all caps. Assuming you can provide it all caps:
endi=`echo DEDE0A01 | sed 's,\(..\)\(..\)\(..\)\(..\),\4\3\2\1,g'`
echo "obase=10; $endi" | bc
Prints 1099999
Else if you run bc before you convert, it prints 99990901.
pavanlimo
2010-09-09 08:56:54
That's converting the hex value dede0a01 to decimal. But first i need to convert it to 01a0eded (using sed) and then convert it to decimal. So how can i use bc after sed ?
Robertico
2010-09-09 09:02:25
You mean convert 'dede0a01' to '10a0eded' not '01a0eded', or not?
Alexander
2010-09-09 09:14:14
Use `bc` before you convert then!. Ultimately you will need to use `bc`, before or after.
pavanlimo
2010-09-09 09:23:14
dec_value=`echo dede0a01 | sed 's,\(..\)\(..\)\(..\)\(..\),\4\3\2\1,g'` makes the conversion to: 010adede (sorry for the typo). After that i need to convert that to 17489630. So how can is use a pipe after sed to make the conversion from 010adede to 17489630 ? Tried bc but can get it work.
Robertico
2010-09-09 09:27:25
It appears that your hex code is not valid, cuz' bc accepts all caps.
pavanlimo
2010-09-09 10:00:24
When i use: echo "ibase=16; 010ADEDE" | bc (ibase instead of obase, and all capital) the conversion works. But i want to add the conversion after sed. So how to use a pipe after sed and then bc.If that's not possible i can use a variable with bc.Tried that already but bc doesn't seems to accept a variable.
Robertico
2010-09-09 10:08:35
A:
endi=`echo dede0a01 | sed 's,\(..\)\(..\)\(..\)\(..\),\4\3\2\1,g' | tr '[a-z]' '[A-Z]'`
echo "ibase=16; $endi" | bc
Works fine. But I'm curious whether this is possible with one line.
Robertico
2010-09-09 10:36:21
Sure. Why not?echo "ibase=16; $(echo dede0a01 | sed 's,\(..\)\(..\)\(..\)\(..\),\4\3\2\1,g' | tr '[a-z]' '[A-Z]')" | bc
bot403
2010-09-09 22:01:41
A:
Do your tr before the sed and have sed add the ibase=16; before piping it all into bc:
dec_value=$(echo dede0a01 | tr '[a-z]' '[A-Z]' | sed 's,\(..\)\(..\)\(..\)\(..\),ibase=16;\4\3\2\1,g' | bc)
If you're using Bash, ksh or zsh, you don't need tr and bc:
(( dec_value = 16#$(echo dede0a01 | sed 's,\(..\)\(..\)\(..\)\(..\),\4\3\2\1,g') ))
or without echo and sed, too:
hex=dede0a01
(( dec_value = 16#${hex:6:2}${hex:4:2}${hex:2:2}${hex:0:2} ))
Dennis Williamson
2010-09-09 15:48:33
+1
A:
Here's a solution that doesn't shell out to bc, and uses only portable, standard syntax, nothing Bash, zsh, or ksh specific:
dec_value=`echo dede0a01 | sed 's,\(..\)\(..\)\(..\)\(..\),\4\3\2\1,g' | (read hex; echo $(( 0x${hex} )))`
Or, somewhat more simply:
: $(( dec_value = 0x$(echo dede0a01 | sed 's,\(..\)\(..\)\(..\)\(..\),\4\3\2\1,g') ))
(You need the : $((...)) to be portable; $((...)) substitutes its result, and the : allows you to ignore it. In Bash and likely ksh/zsh, you could just use ((...)))
Brian Campbell
2010-09-09 18:39:22
A:
Thx all, for the examples. As always, there are many ways to skin a cat :-))
Robertico
2010-09-10 05:33:16