String Format Question 2

[percent]

Here is what I need done - I have a variable $port this variable outputs on a list with different variables($port equals between S0 through S36 I was wondering if there is an easy way to format $port to do the below:

Say $port equals S1 then I would like it to be S01
Say $port equals S11 then I would like it to stay the same
(so what I would like done is add a zero after the S if the number is a single digit number)

I was hoping I would be able to do something like:
$port=formatstringcommand($port)
I beleive the command I need to use is the printf command but I'm not quite sure how to us it.

Any help would be appreciated.


%, 2004

 

[stefanwagner]

I guess there is a smaller solution, but I don't find it.

NORM=$(echo $1 | sed 's/S\([0-9]\)/S0\1/g;s/S0\([0-9][0-9]\)/S\1/g')
echo $NORM

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[percent]

Thank you this was helpful

%, 2004

 

[Ygor]

A smaller sed solution...

port=$(echo $port|sed '/S[0-9]$/s/S/S0/')

...or using printf...

port=$(printf 'S%02d' $((${port#S})))

 

[percent]

Thank you this was helpful Also

%, 2004