Substitution query

[ranjit]

[tt]

# input file
100.21.56.222.22
100.22.56.222.24
100.23.56.222.370
100.24.56.222.2390
server33.22
server45.670

# desired ouput
100.21.56.222,22
100.22.56.222,24
100.23.56.222,370
100.24.56.222,2390
server33,22
server45,670

How do I go about substituting the final "." (dot) to a comma in the above input file ?

[/tt]

 

[PHV]

The sed way:
sed 's!\.\([^.]*\)$!,\1!' /path/to/input > output

Hope This Helps, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884 or FAQ222-2244

 

[ranjit]

Many thanks PHV - certainly works.

However could you please explain the logic underpinning the substitution.

 

[xmb]

A great place to learn about proper regexes is regular-expressions.info

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