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Top Forums Shell Programming and Scripting Watch a directory for new files Post 302726999 by os2mac on Monday 5th of November 2012 01:09:02 PM
Old 11-05-2012
Quote:
Originally Posted by alister
os2mac:

I applaud your desire to help others, but, without exaggerating, your solution is utterly unfit for deployment.



Each iteration of that loop will consume approximately 5 seconds, most of it sleeping while files that will never be detected are created.

If things that do not need to be in the loop are extracted, the situation improves significantly:
Code:
watchdir=/var/tmp
newfile=$watchdir/.newer
touch $newfile
while [ 1 ];
do
        find $watchdir -newer $newfile; 
        -->FILES CREATED DURING THIS WINDOW ARE LOST<-- 
    touch -a -m $newfile;
        sleep 5;
done

There is still a race condition between find and touch, but at least now it's only a tiny fraction of each iteration's wall clock run time.

This is much better, and perhaps it's sufficient for personal use, but if a file cannot go unreported, it's still inadequate.

Regards,
Alister
Thanks for the education Obi Wan, I will endevour to follow you're guidance in the future, master. What other foo can you impart upon a lowly Solaris Junkie?
 

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CP(1)							      General Commands Manual							     CP(1)

NAME
cp, cpdir - file copy SYNOPSIS
cp [-pifsmrRvx] file1 file2 cp [-pifsrRvx] file ... directory cpdir [-ifvx] file1 file2 OPTIONS
-p Preserve full mode, uid, gid and times -i Ask before removing existing file -f Forced remove existing file -s Make similar, copy some attributes -m Merge trees, disable the into-a-directory trick -r Copy directory trees with link structure, etc. intact -R Copy directory trees and treat special files as ordinary -v Display what cp is doing -x Do not cross device boundaries EXAMPLES
cp oldfile newfile # Copy oldfile to newfile cp -R dir1 dir2 # Copy a directory tree DESCRIPTION
Cp copies one file to another, or copies one or more files to a directory. Special files are normally opened and read, unless -r is used. -r also copies the link structure, something -R doesn't care about. The -s option differs from -p that it only copies the times if the target file already exists. A normal copy only copies the mode of the file, with the file creation mask applied. Set-uid bits are cleared if the owner cannot be set. (The -s flag does not patronize you by clearing bits. Alas -s and -r are nonstandard.) Cpdir is a convenient synonym for cp -psmr to make a precise copy of a directory tree. SEE ALSO
cat(1), mkdir(1), rmdir(1), ln(1), rm(1). CP(1)
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