Loop over files and use awk

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# 1  
Old 03-21-2013
Loop over files and use awk

Hi, I have a large number of files which are numbered numerically, i.e. of the type

1.usr, 2.usr, 3.usr ...

This is what I'd like to do:

1. In ascending order, use awk to read a value from each file.

2. Write this value to another file (say data.txt). This file, 'data.txt' should be appended.

The problem is when I use the following command

awk '{print $2 }' *.usr > data.txt

It does write out all the data I need into a file but awk doesn't arrange the files in ascending order when it does it.

# 2  
Old 03-21-2013
ls *.usr | xargs awk '{print $2 }' > data.txt

# 3  
Old 03-21-2013
Originally Posted by lost.identity
awk doesn't arrange the files in ascending order when it does it.
Don't blame awk. It's your shell doing the globbing in lexicographical order.

One way:
printf "%s\n" *.usr|sort -n|xargs awk '...'

This User Gave Thanks to elixir_sinari For This Post:
# 4  
Old 03-21-2013
# 5  
Old 03-21-2013
Supposing that you have 1-3 digit user numbers, you could also use:
awk '{print $2 }' ?.usr ??.usr ???.usr > data.txt

without needing to resort to sort and xargs. Obviously, you'll need more terms in the list of files passed to awk if some of your *.usr names contain more than 3 digits; but the pattern should be obvious with this example.
These 2 Users Gave Thanks to Don Cragun For This Post:
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