Since ls is run twice, there's a race condition. If a directory is deleted in the meantime, a directory that should have been kept will be nuked. Similarly, if a directory is added in the meantime, a directory that should have been removed will persist.
There is no need to run ls twice. You can just use tail's ability to index releative to the beginning of the data, tail -n +10 versus tail -n 10. However, this approach still requires some arithmetic, since skipping the first x lines requires an option argument of x+1.
I wouldn't bother with tail. In my opinion, the simplest solution is to use sed:
Note that xargs does not play well with filenames containing whitespace or quotes. If such filenames occur, instead of xargs, a less efficient while-read loop would be necessary.
Regards,
Alister
What is the command to remove files that are generated 6 hours or older? The find and remove tells only how to remove if the file is one day old or more. Appreciate quick reply. Thanks (3 Replies)
Hi all,
I have an H80 that I'm migrating to 5.3 and prior to doing so it needed the firmware upgraded. I don't have copies of the old firmware that was on it since I was not the one who installed it and there were no copies to be found on the server itself. I installed the latest version and... (4 Replies)
Script help, I need to delete files that are older than 7 days. I do that automatically but I know that a cron job can do the job for me. Any help is greatly appreciated, as you can see, I am a DOS or WINDOWS guy. Little on UNIX. Thanks (3 Replies)
Hi All,
.profile has been replaced with a new one. I need to know the variables used in the older version of .profile. I have a session opened using the old .profile.
Is there a way that I can get the exact file.
I had some luck by using set command. But is there any way that I can get the... (5 Replies)
When I am trying to use below code of for loop on older version of ksh
it not working,and I just want to use only FOR loop
-----------------
for i in (1..5)
do
echo $i
done
-----------------
please suggest.it really stoping me.
FYI: i want to do this only by for loop (2 Replies)
Hi,
I am trying to downgrade the version of rsyslog to the older version (i.e) and when i issue the below command to check the packages i dont see the required package (i.e)
and when i try to install it is complaining about package not found.
Please advise on how to install the... (1 Reply)
Which older version and variant of Debian Linux ISO image should I use?
I attempted to install two versions of Debian Linux Operating System
onto my older full tower computer.
First version, V8.5.0, Amd64, xfce, 32Bit.
Second version V7.11.0, i386, 32Bit.
When trying to install... (1 Reply)
Hello, I'm running Ubuntu 18.04 and I would like to install libboost-python version 1.46. Currently I have installed version 1.65:
wakatana@local-machine:~$ dpkg -l | grep libboost-python
ii libboost-python-dev 1.65.1.0ubuntu1 amd64 ... (1 Reply)
Discussion started by: wakatana
1 Replies
LEARN ABOUT LINUX
dh_usrlocal
DH_USRLOCAL(1) Debhelper DH_USRLOCAL(1)NAME
dh_usrlocal - migrate usr/local directories to maintainer scripts
SYNOPSIS
dh_usrlocal [debhelperoptions] [-n]
DESCRIPTION
dh_usrlocal is a debhelper program that can be used for building packages that will provide a subdirectory in /usr/local when installed.
It finds subdirectories of usr/local in the package build directory, and removes them, replacing them with maintainer script snippets
(unless -n is used) to create the directories at install time, and remove them when the package is removed, in a manner compliant with
Debian policy. These snippets are inserted into the maintainer scripts by dh_installdeb. See dh_installdeb(1) for an explanation of
debhelper maintainer script snippets.
If the directories found in the build tree have unusual owners, groups, or permissions, then those values will be preserved in the
directories made by the postinst script. However, as a special exception, if a directory is owned by root.root, it will be treated as if it
is owned by root.staff and is mode 2775. This is useful, since that is the group and mode policy recommends for directories in /usr/local.
OPTIONS -n, --noscripts
Do not modify postinst/prerm scripts.
NOTES
Note that this command is not idempotent. dh_prep(1) should be called between invocations of this command. Otherwise, it may cause multiple
instances of the same text to be added to maintainer scripts.
CONFORMS TO
Debian policy, version 2.2
SEE ALSO debhelper(7)
This program is a part of debhelper.
AUTHOR
Andrew Stribblehill <ads@debian.org>
8.9.0ubuntu2.1 2012-06-12 DH_USRLOCAL(1)