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trscookie

09-03-2007 03:06 AM

Bash + How to add Hexadecimal numbers

Hi all,

How do you add two hexadecimal numbers together in bash? I have looked all over google and could not find an answer.

Thanks, trscookie.

ghostdog74

09-03-2007 03:13 AM

Code:

# echo $((0xA + 1))

11

# echo $((0xA + 2))

12

# echo $((0xA + 3))

13

# echo $((0xF + 3))

18

# echo $((0xF + 0xF))

30

trscookie

09-03-2007 03:17 AM

hi, thanks for a super speedy response but the answer is in decimal, how do you get the answer in hex?

scoban

09-03-2007 03:25 AM

You can use "bc".

Code:

$ bc -l

obase=16 # Order is important (see note below)

ibase=16 # Once you set input base all numbers are in that base



9+3

C



ibase=A  # set input base to decimal

obase=10 # set output base to decimal



9+3

12

trscookie

09-03-2007 03:49 AM

Getting the wrong result????:

Code:

adrian@adrians-laptop:~$ bc -l

bc 1.06

Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.

This is free software with ABSOLUTELY NO WARRANTY.

For details type `warranty'. 

ibase=16

obase=16

a1+1

 01





adrian@adrians-laptop:~$ bc -l

bc 1.06

Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.

This is free software with ABSOLUTELY NO WARRANTY.

For details type `warranty'. 

obase=16

ibase=16

a1+1

1

shouldn't the answer be a2? Am I doing something wrong here?

Thanks.

ghostdog74

09-03-2007 03:50 AM

Quote:

Originally Posted by trscookie (Post 2879415)

hi, thanks for a super speedy response but the answer is in decimal, how do you get the answer in hex?

Code:

# var=$((0xA + 1))

# echo $var

11

# echo 16o${var}p |dc

B

trscookie

09-03-2007 03:52 AM

Sorry, just realised that it is case sensitive, thanks for all of your help. trscookie

cfaj	09-03-2007 04:22 PM

Quote:

Originally Posted by trscookie (Post 2879415)

hi, thanks for a super speedy response but the answer is in decimal, how do you get the answer in hex?

Code:

printf "%X\n" $((0xA + 2))

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