String generation from user input


 
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# 1  
Old 10-02-2012
String generation from user input

Hi

I have one thing I need advice on, and I don't know where to start so I have no sample code.

I want the user to provide input like: 1-3,6,7,9-11

When the input is like this, I want a string to be generated including all the numbers. In the example above, the string would look like:

1 2 3 6 7 9 10 11

I guess this can be done with AWK in some way, but I have no idea how.

Does anyone have a suggestion?

Tobbe
# 2  
Old 10-02-2012
Will it be just integers? What be the range? Does it need to be comma separated?
# 3  
Old 10-02-2012
Hi

Yes, only integers, 1-14, and separated with space

Tobbe
# 4  
Old 10-02-2012
Hi.

So something that would produce output like this?
Code:
% ./p1 1 2 foo 459-461
./p1: invalid number or field list: foo
1 2 459 460 461

cheers, drl
# 5  
Old 10-02-2012
Try...
Code:
$ n='1-3,6,7,9-11'

$ seq 1 14|paste -s|cut -f "$n"|tr '\t' ' '
1 2 3 6 7 9 10 11

$

# 6  
Old 10-02-2012
Quote:
Originally Posted by Ygor
Try...
Code:
$ n='1-3,6,7,9-11'

$ seq 1 14|paste -s|cut -f "$n"|tr '\t' ' '
1 2 3 6 7 9 10 11

$

Brilliant! I tried with awk and a pattern match on a sequence, but got nowhere.
# 7  
Old 10-02-2012
Simplifying Ygor's inspired approach:
Code:
seq -s ' ' 14 | cut -d ' ' -f "$n"

If seq is not available, on BSD-ish systems use jot.

Regards,
Alister
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