Spin down the harddisk with hdparm
By jeltsch on Wed, 05/23/2007 - 21:57The command to spin down the hard disk after 50 seconds (5x10) being idle:
/sbin/hdparm -S10 /dev/hda
The fact that everything looks different doesn't mean that all has changed...
jeltsch's blog
ps2pdf versus pstill and password protection of pdf documents
By jeltsch on Wed, 05/23/2007 - 21:55While reading about ps2pdf (which is just a commandline front-end to ghostscript), I realized that despite its simple appearance, ps2pdf has almost all capabilities of Acrobat 5. ps2pdf14 outputs Acrobat 5-compatible files. According to the documentation strong password protection should be possible, however, I never managed with that.
In theory the following commands should work:
-sOwnerPassword= and -sUserPassword=
In order to set the key length to 128 you have to use
ps2pdf14 -dEncryptionR=3 -dKeylength=128
ssh host keys
By jeltsch on Wed, 05/23/2007 - 21:52When reinstalling an ssh server, one should keep the ssh key files from the old system. Otherwise ssh clients will receive messages of like "IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!". If you didn't keep the files, the clients can of course delete the entries from the host key file (usually /home/user/.ssh/known_hosts). When the user connects after that again to the server, the new, changed host key files are added to the host key file.