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how to use bitwise or operator in /bin/sh

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# 1  
Old 09-05-2012
how to use bitwise or operator in /bin/sh

please any one can suggest me how to use bitesie || opearator to do this
#initallize a=0 b=0
if [ $? -ne 0 ]then
else	a=1		
#bitwise or opeartion b = a || b

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Mod Comment Please view this code tag video for how to use code tags when posting code and data.

Last edited by vbe; 09-05-2012 at 04:43 AM.. Reason: re indented +code tags
# 2  
Old 09-05-2012
Try this...

Bitwise or operation-

Bit_or () {
if [[ `expr "$a" + "$b"` > 0 ]]
echo "1";
echo "0";

Bitwise and operation-

Bit_and () {
if [[ `expr "$a" \* "$b"` > 0 ]]
echo "1";
echo "0";

This User Gave Thanks to pamu For This Post:
# 3  
Old 09-05-2012
Originally Posted by Palaniappan
#bitwise or opeartion b = a || b
|| is a logical-OR, not a bitwise-OR (in both sh and C).

# 4  
Old 09-05-2012
Plain sh does not have bitwise operators.

BASH does, though.

$ echo $((1|2|4|8|16|32|64|128))


$ echo $((0^0))


$ echo $((0^1))


$ echo $((1^0))


$ echo $((1^1))


$ echo ((1<<4))


$ echo $((255 & 7))




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