Difference between revisions of "Ubuntu Tips"
From wikidb
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(→Text Mode Login) |
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=== Text Mode Login === | === Text Mode Login === | ||
− | + | Setup for text boot. First backup the grub file. | |
+ | |||
cd /etc/default/ | cd /etc/default/ | ||
sudo cp -n grub grub.org | sudo cp -n grub grub.org | ||
− | Edit grub file | + | Edit the grub file reflect these changes as shown by diff. |
diff grub.org grub | diff grub.org grub |
Revision as of 22:11, 22 November 2015
Contents
Run Levels
runlevel telinit 3
Install
- Package search
sudo aptitude search phidget
Each search result is listed on a separate line.
- The first character of each line indicates the current state of the package:
- p, no trace of the package exists on the system,
- c, the package was deleted but its configuration files remain on the system,
- i, the package is installed, and
- v, the package is virtual.
- The second character indicates the stored action (if any; otherwise a blank space is displayed) to be performed on the package,
- i, the package will be installed,
- d, the package will be deleted, and
- p, the package and its configuration files will be removed.
- If the third character is
- A, the package was automatically installed.
The follow provides some of the above info
apt-cache search opencv
- Detailed description of a package
apt-cache show opencv-do
- List the files in a package
dpkg -L opencv-doc
- Find the package a file is in
dpkg -S highgui.h
- Remove unneeded packages
apt-get auto remove
- Get source
apt-get source phidget
Text Mode
Reference
Text Mode Login
Setup for text boot. First backup the grub file.
cd /etc/default/ sudo cp -n grub grub.org
Edit the grub file reflect these changes as shown by diff.
diff grub.org grub 11,12c11,12 < GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" < GRUB_CMDLINE_LINUX="" --- > # GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" > GRUB_CMDLINE_LINUX="text" 20c20 < #GRUB_TERMINAL=console --- > GRUB_TERMINAL=console
Update grub
sudo update-grub
Start up X
To start X in the boot session:
service lightdm start
To Revert
Revert to X boot.
cd /etc/default/ sudo cp grub.orig grub sudo update-grub
Text Mode Old Version
Reference: Modify Ubuntu for text mode
- Edit /etc/init/rc-sysint.conf
diff rc-sysinit.conf rc-sysinit.conf.org 14c14 < env DEFAULT_RUNLEVEL=3 --- > env DEFAULT_RUNLEVEL=2
- Edit /etc/init/gdm.cong
root@tabor:init# diff gdm.conf gdm.conf.org 13d12 < and runlevel[!3]
The result in gdm.conf should be:
start on (filesystem and started dbus and (drm-device-added card0 PRIMARY_DEVICE_FOR_DISPLAY=1 or stopped udevtrigger)) and runlevel[!3] stop on runlevel [016]
Warning: Don't have an SD card connected to the USB port - maybe it tried to boot from it?
To get it going in X.
startx
Won't Boot
Boot from the 10.04 Install CD.
sudo mkdir /media/tmp mount /dev/sda1 /media/tmp cd /media/tmp/etc fix things
ssh
- OpenSSH Server set up
Two ways to start service
sudo /etc/init.d/ssh start sudo service ssh start
Two was to stop service
sudo /etc/init.d/ssh stop sudo service ssh stop
Using ssh on Mac
ssh -X eepp@10.0.0.122
system load
uptime top dstat cat /proc/loadavg
load from wikipedia
change hostname
- Edit /etc/hostname , make the name change, save the file.
- You should also make the same changes in /etc/hosts file.
- Run sudo /etc/init.d/hostname restart or sudo service hostname restart. (There is no hostname init script so I rebooted.)
- change name
Printing
Something like:
- Preferences -> Printers
- Add
- Device first expand Network Printer
- Device choose Network Printer
- Enter 10.0.0.3 as Host and press find
Also install ascii 2 ps
sudo apt-get install a2ps
find
find /opt/ros/jade/ -name *.so -exec grep CamShift "{}" ";"
Hardware Info
sudo apt-get install hardinfo hardinfo&
or
lspci -nnk | grep net -A2
or
lshw