Filtering duplicate emails with procmail

We have a few departments on campus and each user has a username in at least one department plus the top level domain. This means that if an email is sent to username@dept.company.net and there is a cc to username@company.net Then username will get the email twice. After playing around I found that procmail can track the messageid's of emails in a file, so i have this simple rule to filter out. PMDIR=$HOME/.procmail :0 Whc: msgid.lock | formail -D 4096 $PMDIR/idcache :0 a: Mail/duplicates

:0 Whc: msgid.lock This sends the headers t

lvscan lvdisplay lvm after cluster install without configuring cluster

After installing the cluster stuff (GFS), lvscan and lvdisplay stopped working with the following error: [uphill@zürich]: lvscan connect() failed on local socket: Connection refused Locking type 2 initialisation failed.

Howto iterate through an input stream without a subshell or a read.

It sometimes comes up that the usual trick of reading in a stream with a pipe and a while loop doesn't work, since the pipe causes a subshell and any variables set in the subshell are unavailable to the parent.
For example the normal trick (output the first few lines of the /etc/services file, just the first two columns and not empty or comment lines):

[uphill@zagreb]: grep -v ^# /etc/services | grep -v ^$ | head | awk '{print $1" "$2;}'
tcpmux 1/tcp
tcpmux 1/udp
rje 5/tcp
rje 5/udp
echo 7/tcp
echo 7/udp
discard 9/tcp
discard 9/udp
systat 11/tcp
systat 11/udp

Howto use arrays in bash to store indexed information

Sometimes it's easier to write a quick script in bash that uses arrays rather than figure out how to do it with something more appropriate like awk or perl.

It's really very quick and simple. To start, declare your variable as an array


[uphill@host]: declare -a myvar

If the array is going to be global then add x to export it.

.Xdefaults app-defaults not applying automatically

In RHEL4 and possibly other distros. The .Xdefaults file is not used, the file is now called .Xresources In /etc/X11/xinit/xinitrc-common, xrdb is passed .Xresources _after_ /etc/X11/Xresources. You can make systemwide changes in /etc/X11/Xresources, but they will be overridden by changes to .Xresources.

Mind Path Technologies Pocket Point RF Remote in Acroread/Others (on Linux)

I'm hoping that someone else has a better solution for this one. We have a pocketpoint remote that works quite well for Power point presentations, but for Acrobat Reader the keybinding is not good. The remote sends p for prior/previous and n for next, which is understood by powerpoint and not by Adobe. I wrote the following lame script to fix this. It works for the most part, but you lose the p and n keys during the presentation. [includecode#../scripts/pocketpoint]

Binding Windows Key to Gnome (foot/hat) Panel Menu

First run xev to see what the keycode is for your Windows Key On my keyboard it is 115 and is bound to Super_L.

RHEL4 on Thinkpad T60p (Sleep+Wireless)

This laptop is 100% Lenovo. It's a lot different! I did get the ATI driver working. Update, the ChipID hack is no longer needed, Release 8.25.18 adds support for the V5200.

Sleeping

Finally, 2.6.17-rc6 is able to make this thing sleep and wake properly, phew. Ok, I seem to have a working RPM, so I'll post it, let me know if you have issues with this rpm, I've resumed a few times without issue. This is the Fedora RPM with all the patches but 2.6.17-rc6 removed.

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