Masao Kitamura » Linux

Linux: Send Process To Background And Logout

Masao — Fri, 30 Sep 2011 23:29:57 +0000

While process is running, press CTRL-z, then...
$ bg
(the output may come to foreground again, but you can logout now
and the process will continue running in the background)

Linux: Using Daemonize To Run User Processes In The Background

Masao — Thu, 29 Sep 2011 16:46:00 +0000

You must use full paths to all arguments for daemonize.

As of now, daemonize must be downloaded and compiled, it does not exist in APT.

$ daemonize /usr/full/path/to/node /home/full/path/to/app.js

Linux: How To Fix “node js openssh not found”

Masao — Thu, 22 Sep 2011 11:38:41 +0000

apt-get install -y pkg-config

Linux: How To Find Disk IO Usage Per Process

Masao — Wed, 21 Sep 2011 16:03:06 +0000

Sendmail sometimes uses a lot of disk IO by kicking off this process:

  215 root      20   0     0    0    0 D    1  0.0 187:49.63 [jbd2/dm-0-8]

Tools you can try using:

iostat
iotop

Before:

# iostat 1
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.57    0.30    1.28   25.45    0.00   72.40

Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
sda             145.50        22.54      1432.56   38268380 2431954938
dm-0            370.18        22.48      1432.37   38162397 2431624576
dm-1              0.06         0.05         0.18      79200     308588

After:

# /etc/init.d/sendmail stop
 * Stopping Mail Transport Agent (MTA) sendmail                                                        [ OK ]
# iostat 1
Linux 2.6.38-11-server (web201) 	09/21/2011 	_x86_64_	(4 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.00    0.00    0.00    0.00    0.00  100.00

Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
sda               0.00         0.00         0.00          0          0
dm-0              0.00         0.00         0.00          0          0
dm-1              0.00         0.00         0.00          0          0

Sendmail alternative:

# apt-get install -y postfix
(blah blah blah)
 * Starting Postfix Mail Transport Agent postfix         [ OK ]
# sendmail -t
To:me@gmail.com
Subject: test after postfix installed
do it
(this works)

Linux: How To Play AVI Files

Masao — Mon, 19 Sep 2011 19:41:04 +0000

APT packages needed to play FFmpeg .avi files:

p   gstreamer0.10-ffmpeg            - FFmpeg plugin for GStreamer
p   gstreamer0.10-plugins-bad       - GStreamer plugins from the "bad" set

VIM: Swap Left Hand Directional Keys With Right Hand Command Keys

Masao — Fri, 16 Sep 2011 00:09:46 +0000

Reduce usage in your right hand using these mappings.

- Mirror up and down keys
- Shift left and right keys to the left hand
- 's' (change one character and insert) becomes 'h'
- 'd' ('dd' deletes a line) becomes 'k'
- 'f' ('ff' moves cursor to end of line) becomes 'j'
- 'g' (does nothing by itself) becomes 'l'
- 'noremap' avoids infinite loop

~/.vimrc:

" Map Right Hand Directionals to Left Hand Commands
noremap s h
noremap d k
noremap f j
noremap g l

" Map Left Hand Commands to Right Hand Directionals
noremap h s
noremap k d
noremap j f
noremap l g

Ubuntu: CMake “RPM package requires rpmbuild executable”

Masao — Thu, 15 Sep 2011 14:19:35 +0000

apt-get install -y rpm

Linux: Backup Entire Directories With Revision Control Using Subversion SVN

Masao — Sat, 10 Sep 2011 19:12:32 +0000

General steps (for example, the /etc directory)

Install Ubuntu Server
Log in and sudo bash.
Import the /etc directory into your SVN repository.
Check out the new directory and call it “/etc.new”
Move out the old directory: “mv /etc /etc.old”
Move in the new directory: “mv /etc.new /etc”
Fix sudoers permissions: “chmod 0440 /etc/sudoers /etc/sudoers.d/README”
Reboot

Linux: Subversion SVN+SSH Import New Project

Masao — Fri, 09 Sep 2011 01:50:47 +0000

svn import myfolder svn+ssh://kitamura@svn2.cs.lmu.edu/svn/myfolder \
  -m "my comment"

Ubuntu Linux: Flush, Clear, Renew DHCP Cache

Masao — Sun, 21 Aug 2011 18:37:15 +0000

When all else fails on the client… # apt-get install -y dhcpcd # dhcpcd eth0 # dhcpcd.sh: interface eth0 has been configured with new IP=XXX.XXX.XXX.XXX If it still fails, restart the DHCP server… # /etc/init.d/dhcp3-server restart Other things to try … Continue reading →