Unix
Often (and especially when scanning documents with my printer) from MacOSX I would get unreasonable huge PDFs which are not suitable for emails. To strip them down without pain one can use ghostprint: gs -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -sOutputFile=output.pdf input.pdf To get gs installed,
Java
If you look around on the internet you may find a lot of blogs guiding you on the installation of Jetty in RHEL 7 (or CentOS) which require you to download a new fresh distribution of Jetty tarball. Since Jetty is already packaged in RHEL 7, I’d rather use
Electronics
Parallel and serial ports are disappearing from today’s pc making life harder for the people who wants to connect their home-made devices to a pc. Some time ago I was considering USB, but it's really quite complex, so I looked over it. The I2C bus instead is
Linux
On CentOS 5 (and RedHat EL as well), you can encounter the following behaviour when configuring an nrpe plugin with sudo: [andrea@feyd ~]$ /usr/lib/nagios/plugins/check_nrpe -H 1.2.3.4 -c check_md_raid NRPE: Unable to read output Given that check_md_raid is defined
Linux
Mount a samba share on the fly without having it mounted statically at boot via the /etc/fstab file can bring you the advantage of a painless boot in case of unavailability of the samba server like in the following common scenarios: * laptop: you mount your pc share at home,
Amarok
On my Fedora 8 system with Amarok I was trying to fill an mp3’s tag header using MusicBrainz, getting the following error: Tunepimp (MusicBrainz tagging library) returned the following error: "Fingerprinting of .mp3 files is not supported." To make it work, just yum install libtunepimp-extras-nonfree
Linux
Recently I’ve been in an awkward situation with ssh and X11 forwarding, where ssh using the classic -Y or -X option wasn’t working (DISPLAY was not set): [andrea@duncan ~]$ ssh -Y root@thufir root@thufir's password: Last login: Sat Apr 12 23:30:09 2008 from