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awk is Printing folders with only numbers as expected. But can't explain 'total' statement.

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Top Forums Shell Programming and Scripting awk is Printing folders with only numbers as expected. But can't explain 'total' statement.
# 1  
Old 09-02-2010
awk is Printing folders with only numbers as expected. But can't explain 'total' statement.
I am trying to get folder names that contain only numbers.

Can someone explain why following command is printing 'total 450' as part of output..

Code:
 
$>  ls -lt | awk '$9 ~ /^[1-9]*$/' | more
total 450
drwxr-x--x   3 user1  group1     512 Mar  9  2008 329227163
drwxr-x--x   3 user1  group1     512 Mar  9  2008 1285642344
drwxr-x--x   3 user1  group1     512 Mar  9  2008 94825883

Rest of the output is expected.
# 2  
Old 09-02-2010
Code:
ls -lt | awk '$9 ~ /^[1-9]+$/' | more

This User Gave Thanks to bartus11 For This Post:
kchinnam
# 3  
Old 09-02-2010
Quote:
Originally Posted by kchinnam
I am trying to get folder names that contain only numbers.

Can someone explain why following command is printing 'total 450' as part of output..

Code:
 
$>  ls -lt | awk '$9 ~ /^[1-9]*$/' | more
total 450
drwxr-x--x   3 user1  group1     512 Mar  9  2008 329227163
[...]

[1-9]* is 0 or more, therefore you're searching for empty or only numeric 9th field.
You need 1 or more - [1-9][1-9]* or [1-9]+ (if supported).
# 4  
Old 09-02-2010
'cause "/[^1-9]*$" evaluates to 0 or more digits.
As there's no field 9 in 'total 450', the condition is true.
Try - you need one or more occurrences of digits:
Code:
ls -lt | awk '$9 ~ /^[1-9][1-9]*$/'

# 5  
Old 09-02-2010
wow, so quick so many working solutions. Thaks to everyone. All solutions are working.

Yes,, ^[1-9]*+ is equivalent to 1 or more occurances of names that contain only numbers. Thanks to bartus11.

Code:
ls -lt | awk '$9 ~ /^[1-9]+$/'

Last edited by kchinnam; 09-02-2010 at 10:54 AM.. Reason: grammer
# 6  
Old 09-02-2010
Just to add that recent shells support extended globbing and if you're using one of them, you don't need awk for this task.

With ksh:

Code:
ls -lt !(*[!1-9]*)

With bash:

Code:
shopt -s extglob
ls -lt !(*[!1-9]*)

Or 0-9, depending on your needs.

With zsh:

Code:
ls -lt <->

# 7  
Old 09-02-2010
It appears on solaris 8 I have extended set here --> /usr/xpg4/bin/ls
But I am not sure where in your reg.exp you are telling it to act only on folder names(column 9).

Also why can't we tell extended globber to understand something like
this -->
Quote:
(^[1-9])+$ or +(^[1-9])$
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