Bashscripts.org

Hy every body,

let say we got:


Using the sed command, how to invert them like this :



Thank you very much for your help

Using substitute/regex/replacement/print statement.

The first group () searches for a single [ non ^ characterclass [:blank:] ] which must occur + at least one times.
Then there must be at least one char of the class [ named [:blank:] which must occur again + at least one times.
Followed again by the first part to denote the ip address as well, but this time the chars end up in the second group.

The replacement then is just group \2 followed by a blank followed by group \1

Note!
This "solution" works with all kinds of chars.
A file containing

will print


One can specify the mac and ip addresses properly using the char classe [:hdigit:] and [:digit:]
Wrote this in another post recently.