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Full Discussion: Excluding files with timestamp from ls
Top Forums Shell Programming and Scripting Excluding files with timestamp from ls Post 302947123 by Don Cragun on Monday 15th of June 2015 03:54:17 PM
Old 06-15-2015
As Aia said, in this case, you're just creating or updating the timestamps of a file named fn with your current loop. The touch command creates files named as operands if they didn't already exist and updates the timestamps of files that already existed; it doesn't remove the contents of a file.

If what you're trying to do is turn your selected files into empty files, there is no need for ls or grep, you can just use something like:
Code:
#!/bin/ksh
for fn in sample*
do	[ "$fn" == "${fn%*:*}" ] && > "$fn" && printf '%s truncated\n' "$fn"
done

which (since it just uses shell built-ins and doesn't need to invoke ls, grep, and touch) will run faster, and it will work even if some of your filenames contain whitespace characters (i.e., space, tab, or newline).
 

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LEARN ABOUT DEBIAN

flow-expire

flow-expire(1)						      General Commands Manual						    flow-expire(1)

NAME

       flow-expire -- Manage storage of flow file archives by expiring old data.

SYNOPSIS

       flow-expire [-h]  [-d debug_level]  [-e expire_count]  [-E expire_size] -w workdir

DESCRIPTION

       The flow-expire utility will remove the oldest flow files in a directory based on either a count of files or space utilization.	The direc-
       tory is recursively searched for flow files.  Files that do not have a flow-tools signature will be ignored.   The  internal  timestamp	is
       used  so backups or copies of the flow files that do not retain the original timestamp will not impact the operation of flow-expire.  flow-
       expire is typically used to manage storage in a distributed environment where flows are collected on  a	different  server  than  they  are
       archived.

OPTIONS

       -d debug_level
		 Enable debugging.

       -e expire_count
		 Retain the maximum number of files so that the total file count is less than expire_count.

       -E expire_size
		 Retain the maximum number of files so that the total storage is less than expire_size.  The letters b,K,M,G can be used as multi-
		 pliers, ie 16 Megabytes is 16M.

       -h	 Display help.

       -w workdir
		 Work in workdir.

EXAMPLES

       Remove the oldest flow files in /flows/krc4 until the total storage is less then 2 Gigabytes.

	 flow-expire -E2Gig -w /flows/krc4

       Remove the oldest flow files in /flows/krc4 until the total number of files is less then 100.

	 flow-expire -e100 -w /flows/krc4

BUGS

       Empty directories are not removed.

AUTHOR

       Mark Fullmer maf@splintered.net

SEE ALSO

       flow-tools(1)

																    flow-expire(1)
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