This file contains various hacks that I had to apply in different situations
to get things going.

1- Malformed UTF-8 character when compiling
	Occurred while compiling l4.
	FIX - do export LANG=en_US to fix.

2- Linux ssh timeouts 
	set /proc/sys/net/ipv4/tcp_keepalive_time to 100 (e.g. on a natted box)

3- mksh: Fatal error in reader: = missing from replacement macro reference
	use gnu make rather than make

4 - autoreconf barfs with config/depcomp not found
	use autoreconf-2.53 -i

5 - ipkg doesn't want to install task-x, cross dependency on x-display-manager
	first install nullxdm (from unstable feed -- this was true as of
	familiar 0.7.2) and then install task-x

6 - Example of sed pattern usage
	s/V\(.*\)/& \1/
	will transform VEcho => VEcho Echo

7- Making a table span both columns in a twocolumn document in latex
	use table* instead of table.

8- Config file for the current kernels can be found as /boot/config-`uname -r`

9- If cpp seems to run forever, you might be running cpp 2.95.2 which has "argument list
too long" bug. Upgrade.

10- Creating quality pdf files of latex docs
    dvips -Ppdf -G0 paper.dvi
    ps2pdf paper.ps

11- if make invokes "missing" script, which run autotools and mess up macros, 
    first do a touch * on all the files. 

12- To identify processes using files or sockets use fuser, e.g.
    fuser -n tcp 38374,207.46.106.99,1863
    tells which process has this connection open (this one is for yahoo
    messenger)

13- Linux can be booted first to shell by init=/bin/sh on the command line,
then from the shell do "exec /sbin/init" to boot the whole thing. Helps while
debugging.
    
14- If mutt complains as "inbox not a mailbox" for inbox generated by procmail
, use procmail with -f- switch to fix the format.

15- To create preprocessor files to see values of different variables etc
before compilation, specially kernel compilation, do following:
  make V=1 O=../build/linux kernel/timer.o
  copy paste the gcc command line in /tmp/foo
  remove -c switch and put -E -dD -o /tmp/XXX.i
  run as (cd ../build/linux; . /tmp/foo)

16- weak linking
  Just to define a function without worrying whether its implementation
  actually exists (useful for compiling for multiple archs), define in a
  common .h as
    extern void foo (void) __attribute__ ((weak))
  Then call it as
    if (foo)
      foo();
  This way function can be used as a variable.
17- useful commands
  nmap - port scanner.
  pstree - see running processes in a tree form.

18- gconf errors after a possible system crash
  remove the lock files in .gconfd and .gconf

19- Running tftp
        server#: ./tftpd -l -c -vvv -a :5555 -u rhim /tmp
        client<busybox>#  tftp [-p|-g] -l <file> -r <file> server 5555

20- Extracting a file from rpm
        rpm2cpio <rpm> | cpio -ivd <file name>
        file name must match exactly as list in 
        rpm2cpio <rpm> | cpio -t

21- Profiling sub-function code with MARK and prof.h
        man (-s 5) prof

22- Finding what package provides a file.
        whereis <file name>
        rpm -qfi <whole path name>

23- Checking what files  are not in CVS repository
        cvs -qn update | grep '^?'

24- Programming a sony remote (tested with RMT V501E) to control philips
TV
        Keep the I/O button pressed, enter code (08) and press enter.

25- Removing all files from CVS that were moved in one go
        for i in `cvs -qn update 2>/dev/null | cut -d " " -f2`; do cvs remove
$i; done

26- Sudo access with ssh X11 forwarding
        echo $DISPLAY
        xauth list
        COOKIE = line containing unix:N where DISPLAY==localhost:N 
        sudo bash
        xauth add COOKIE

27- Using BT headset with btsco module
        btsco -v <BT ID>
        check /etc/asound.names and look for BT headset in pcm section.
        alsactl32 {
            name 'plughw:2,0'
            comment 'Physical Device With Conversions - BT SCO PCM (Duplex)'
        }

        mplayer -ao alsa:noblock:device=plughw=2.0 <file>
        mpg123 --wave - file.mp3 | aplay -D plughw:Headset

        if there are continuous authentication failures, try removing 
        /var/lib/bluetooth/<>/linkkeys file and restart bluetooth
        service.
         arecord -D hw:#,# -f S16_LE > /tmp/test
         aplay -D hw:#,# /tmp/test 
        where #,# are card number and subdevice number, respectively.


28- Finding current runlevel
        who -r

29- When printing an image from word to pdf, the image prints on a
letter paper by default, but the desired dimension of the pdf image is
the same as that of original image.
        In adobe acrobat 5, use document, crop pages, remove white
        margins to automatically change the paper size to original
        image.

30- Formula for number of zeros in a factorial
        floor(n/5) + floor(n/25) + floor(n/125) + ... + floor(n/5^k) + ...

31- Installing fc6 remotely on JS2X system
        - 0> boot net:<TFTPSERVER IP>,ppc64.img,<CLIENT IP>,<GW IP> console=hvc0
        - console=hvc0 is important for JS21 since there is no vga
          console.

32- Cleaning up caches before creating snapshots (saves from snapshot
creation failure error due to "in use")
        sync; sleep 1; sync
        echo 3 > /proc/sys/vm/drop_caches

33- Exporting an openoffice chart in Calc to .eps.
        Copy pasted the chart in OO draw. From there, select the image
        and choose File->Export, and EPS format. Voila!