CODEWITHSUNDEEP
regexbashmac-address
Pete
Pete

Reputation: 171

Add leading 0 to mac address in bash

I'm writing a script on bash to read MAC address from a group of devices and I'm stucked with one switch that returns address without leading 0. For instance:

0:A:B:11:22:C -> that would be -> 00:0A:0B:11:22:0C

Is there any way a regex could add these leading zeroes? I could take each address separately, take its bytes and adjust it, but I was wondering if there's an easier way.

Upvotes: 0

Views: 1738

Answers (2)

anubhava
anubhava

Reputation: 785481

Here is way to do this in BASH itself using read and printf built-ins:

s='0:A:B:11:22:C'
IFS=: read -ra arr <<< "$s"
printf -v str "%02s:" "${arr[@]}"
echo "${str%:}"
00:0A:0B:11:22:0C

Upvotes: 0

Avinash Raj
Avinash Raj

Reputation: 174766

You could use sed. \b matches between a word character and a non-word character. So \b\(\w\)\b captures the substring which has a single word character.

sed 's/\b\(\w\)\b/0\1/g' file

Example:

$ echo '0:A:B:11:22:C' | sed 's/\b\(\w\)\b/0\1/g'
00:0A:0B:11:22:0C

Upvotes: 4

Related Questions