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add only one space after each word in a string

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# 8  
Old 02-15-2012
Quote:
Originally Posted by Scrutinizer
And here is how to do it in awk:
Code:
echo "$a" | awk '$1=$1'

Superb!Could you please explain how it works in awk?

Thanks
Last edited by pandeesh; 02-15-2012 at 01:16 AM..
# 9  
Old 02-15-2012
Quote:
Originally Posted by Scrutinizer
And here is how to do it in awk:
Code:
echo "$a" | awk '$1=$1'

Thanks I'll use this one.. Smilie
# 10  
Old 02-15-2012
@pandeesh. If you assign a value to one of the fields of a record ( $1, $2, ... ) then the entire record $0 gets recalculated and the FS (input field separator) gets replaced by the output field separator (OFS). Both are at the default in this case. The default FS is " ", a single space and this has a special meaning, namely any mixture of consecutive tabs and spaces. The default OFS is also a single space, but in this case it means just that, a single space. So the end result is that every occurrence of any amount of whitespace gets replace by a single space.
These 2 Users Gave Thanks to Scrutinizer For This Post:
jim mcnamara pandeesh
# 11  
Old 02-15-2012
Is it possible to achieve the same using tr?
# 12  
Old 02-15-2012
Perhaps like so:
Code:
echo "$a" | tr -s '\t ' ' '

This User Gave Thanks to Scrutinizer For This Post:
h0ujun
# 13  
Old 02-15-2012
Quote:
Originally Posted by Scrutinizer
And here is how to do it in awk:
Code:
echo "$a" | awk '$1=$1'

And it seems this is equivalent to:
Code:
echo "$a" | awk '$0=$0'

# 14  
Old 02-15-2012
Quote:
Originally Posted by pandeesh
And it seems this is equivalent to:
Code:
echo "$a" | awk '$0=$0'

No, it outputs the input file.
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