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Shell Programming and Scripting

Problem passing directory as argument with awk

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Top Forums Shell Programming and Scripting Problem passing directory as argument with awk
# 8  
Old 03-03-2010
Quote:
Originally Posted by scottn
awk takes files, or standard input as input, not directories.
Code:
nawk -f ./test.awk /tmp/dir/*

# 9  
Old 03-03-2010
Quote:
Originally Posted by vgersh99
Code:
nawk -f ./test.awk /tmp/dir/*

What does * expand to?

Code:
# mkdir tmp
# mkdir tmp2
# mkdir tmp/1 tmp/2
# echo hello > tmp2/1; echo world > tmp2/2
# awk '{ print $NF }' tmp/*               
(nothing)
# awk '{ print $NF }' tmp2/*
hello
world

# 10  
Old 03-03-2010
That will take all of the content in all of the files. I only need the file names.

In any case, there are better ways to get a list of files in a directory. I'll just use something a little cleaner.

All the same, thanks for checking it out.
# 11  
Old 03-03-2010
Quote:
Originally Posted by scottn
What does * expand to?
What do you think? Smilie
using shell's filename generation it will expand to all the files/directories/links/etc at a given location on a file system.

Quote:
Originally Posted by scottn
Code:
# mkdir tmp
# mkdir tmp2
# mkdir tmp/1 tmp/2
# echo hello > tmp2/1; echo world > tmp2/2
# awk '{ print $NF }' tmp/*               
(nothing)
# awk '{ print $NF }' tmp2/*
hello
world

Are you surprised? Would you expect anything else?
# 12  
Old 03-03-2010
Quote:
Originally Posted by vgersh99
What do you think? Smilie
using shell's filename generation it will expand to all the files/directories/links/etc at a given location on a file system.


Are you surprised? Would you expect anything else?
No, I wouldn't Smilie

But passing awk a directory name in itself (like ~), or a directory which doesn't contain any files, doesn't mean anything to it.

That's all I was saying Smilie

Code:
# echo hello again > tmp/3 
# ls -l tmp
total 8
drwxr-xr-x  2 scottn  staff  68  3 Mar 22:09 1
drwxr-xr-x  2 scottn  staff  68  3 Mar 22:09 2
-rw-r--r--  1 scottn  staff  12  3 Mar 22:28 3

# awk '{ print $NF }' tmp/*
again

# 13  
Old 03-03-2010
ah, we're in violent agreement then!
# 14  
Old 03-03-2010
Happily, yes Smilie

(and sorry that perhaps my initial point was not as clear as it might have been Smilie)
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