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Full Discussion: Crontab - URGENT pls
Top Forums UNIX for Dummies Questions & Answers Crontab - URGENT pls Post 6768 by LivinFree on Wednesday 12th of September 2001 07:01:53 AM
Old 09-12-2001
Depending on your user base (are all of you privelaged-type users, or do you have a lot of "regular" users on your system?), you could do a few things.

Number one, I'd (personally want to) place your commands into a script - just execute the script from cron. That way it'll be much easier to handle the jobs efficiently, and to include a little error handling as well. You could write anything in the script you wanted, including displaying a warning in the MOTD upon backup failure, mailing out to certain users, creating a log file, etc, etc, etc... Besides, if you run the script from cron, as opposed to the command itself, it will be much easier to update and change in the future.

Code:
#!/bin/sh
mv /etc/motd /etc/motd.bk
cat << EOF > /etc/motd
************************
There is a system backup in progress!
Please allow this to complete before
Modifying any of your files!
************************
EOF
wall << EOF
There is a system backup starting in one minute!
Please save all of your work now, and please
refrain from modifying any files until the back
is complete!
EOF
# Give them a few extra seconds
sleep 75 
echo "Start time: `date`" > /var/tmp/tar.log
tar cAuvf /dev/rmt/0m /home > /var/tmp/tar.log 2>&1 ; \
     chmod 600 /var/tmp/tar.log
mv /etc/motd.bk /etc/motd
wall << EOF
The backup of your home direcories is now complete!
Thank you for your patience.
EOF
echo "Stop time: `date`" >> /var/tmp/tar.log

Now, if you want that much extra debugging, at the top of the script, right under "#!/bin/sh", insert a line like this one:
set -x. If you do this, it also might be a good idea to redirect the entire script output to a different file:
30 2 * * * /path/to/my/fake/script.sh >> /var/tmp/tar-debug.log 2>&1

Please do not use the script above in a production environment, because I just made it up right now - instead hopefully you can grab some ideas out of it and build one that suits your needs - just keep in mind that the logs (both the tar -v output and the set -x output) will help you immensly!

Hope that helps!
Last edited by LivinFree; 09-12-2001 at 08:06 AM..
 

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LEARN ABOUT CENTOS

git-tar-tree

GIT-TAR-TREE(1) 						    Git Manual							   GIT-TAR-TREE(1)

NAME

       git-tar-tree - Create a tar archive of the files in the named tree object

SYNOPSIS

       git tar-tree [--remote=<repo>] <tree-ish> [ <base> ]

DESCRIPTION

       THIS COMMAND IS DEPRECATED. Use git archive with --format=tar option instead (and move the <base> argument to --prefix=base/).

       Creates a tar archive containing the tree structure for the named tree. When <base> is specified it is added as a leading path to the files
       in the generated tar archive.

       git tar-tree behaves differently when given a tree ID versus when given a commit ID or tag ID. In the first case the current time is used
       as modification time of each file in the archive. In the latter case the commit time as recorded in the referenced commit object is used
       instead. Additionally the commit ID is stored in a global extended pax header. It can be extracted using git get-tar-commit-id.

OPTIONS

       <tree-ish>
	   The tree or commit to produce tar archive for. If it is the object name of a commit object.

       <base>
	   Leading path to the files in the resulting tar archive.

       --remote=<repo>
	   Instead of making a tar archive from local repository, retrieve a tar archive from a remote repository.

CONFIGURATION

       tar.umask
	   This variable can be used to restrict the permission bits of tar archive entries. The default is 0002, which turns off the world write
	   bit. The special value "user" indicates that the archiving user's umask will be used instead. See umask(2) for details.

EXAMPLES

       git tar-tree HEAD junk | (cd /var/tmp/ && tar xf -)
	   Create a tar archive that contains the contents of the latest commit on the current branch, and extracts it in /var/tmp/junk directory.

       git tar-tree v1.4.0 git-1.4.0 | gzip >git-1.4.0.tar.gz
	   Create a tarball for v1.4.0 release.

       git tar-tree v1.4.0^{tree} git-1.4.0 | gzip >git-1.4.0.tar.gz
	   Create a tarball for v1.4.0 release, but without a global extended pax header.

       git tar-tree --remote=example.com:git.git v1.4.0 >git-1.4.0.tar
	   Get a tarball v1.4.0 from example.com.

       git tar-tree HEAD:Documentation/ git-docs > git-1.4.0-docs.tar
	   Put everything in the current head's Documentation/ directory into git-1.4.0-docs.tar, with the prefix git-docs/.

GIT

       Part of the git(1) suite

Git 1.8.3.1							    06/10/2014							   GIT-TAR-TREE(1)
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