Insert a colon between every two digits

sed 's/\(..\)/\1:/g;s/:$//' mac_address_list
I sometimes have large files of MAC addresses stored in a file, some databases need the information stored with the semicolon (makes for easier programming a device) others don't. I have a barcode to text file scanner which usually butchers MAC addresses so this was the fix> I initially did this in awk ;) awk '{for(i=10;i>=2;i-=2)$0=substr($0,1,i)":"substr($0,i+1);print}' mac_address_list
Sample Output
more mac_address_list && sed 's/\(..\)/\1:/g;s/:$//' mac_address_list
000000abde00


00:00:00:ab:de:00

6
By: sil
2009-02-18 14:38:37
sed

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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