Linux, programming and more
Important hardware monitoring – check HDD temperature:
Install (Debian /Ubuntu way):
1 | aptitude install hddtemp |
Check it:
1 2 3 4 | hddtemp /dev/sda1 # Output: # /dev/sda1: ST31500341AS: 42°C # /dev/sdb1: ST31500341AS: 38°C |
1 2 3 | hddtemp -n /dev/sda1 Output: # 42 |
Sometimes I have to share some files over HTTP and I have no time to install apache or lighty. Everyone who has python can use SimpleHTTPServer module which can be started from command line.
Every request to your files will be logged to the terminal.
Start web server in some directory which should be shared:
1 2 | [root@hexa-core webserver]# python -m SimpleHTTPServer 88 Serving HTTP on 0.0.0.0 port 88 ... |
You can change the port!
Logs:
1 | pD4B88C85.dip.t-dialin.net - - [13/Jan/2011 21:57:01] "GET / HTTP/1.1" 200 |
I think you now this problem, you have a lot different hosts with different ssh ports.
It takes to much time to write the full ssh commands and recognize all of your ports:
Easy solution – use aliases:
1 2 3 4 5 6 | vim .ssh/config # Add this Host piper HostName piper User root Port 1022 |
1 | ssh piper |
The simple way to install grub/ grub2 from any linux live-CD or any other bootable medium.
Step 1: boot from linux live CD/DVD or even USB
Step 2: mount your hdd
Step 3: chroot in the mounted filesystem
Step 3: install grub
Step 4: reboot
1 2 3 4 5 6 7 8 9 | fdisk -l mount /dev/sda1 /mnt/ mount -t proc none /mnt/proc mount -o bind /dev /mnt/dev mount -t sysfs sys /mnt/sys chroot /mnt/ /bin/bash update-grub /usr/sbin/grub-install --recheck --no-floppy /dev/sda sync & reboot |
SUSE Syntax:
update-grub is debian and ubuntu little helper this execute the same as:
1 2 3 | grub2-install --recheck --no-floppy /dev/sda grub2-mkconfig -o /boot/grub2/grub.cfg mkinitrd |
Some hardware just don’t work with ehci_hcd on Ubuntu and other distributions. My older mobile phone refused to work no matter what I did and want. After plugging the device nothing happened, doing dmesg showed me the following error:
Output from dmesg:
1 2 3 4 5 | [ 4494.828096] usb 5-1: new low speed USB device using uhci_hcd and address 41 [ 4495.244038] usb 5-1: device not accepting address 41, error -71 [ 4495.356066] usb 5-1: new low speed USB device using uhci_hcd and address 42 [ 4495.768030] usb 5-1: device not accepting address 42, error -71 [ 4495.768057] hub 5-0:1.0: unable to enumerate USB device on port 1 |
After searching a lot around web, I came to a conclusion that my device (mobile phone) doesn’t work with USB 2.0. So I tried to disable the ehci_hcd to make it work.
Since Karmic doesn’t use ehci_hcd as a module, modprobe -r ehci_hcd no longer works. This module was compiled into the kernel.
There is a trick to disable it. execute the following commands in terminal:
1 2 | cd /sys/bus/pci/drivers/ehci_hcd ls |
You will see one or two files with 0000:00:xx.x format. Execute the following command:
1 | sudo sh -c 'echo -n "0000:00:xx.x" > unbind' |
Replace the xx.x with the numbers displayed on your file/s. It should disable the ehci_hcd.
Another way:
1 2 | cd /sys/bus/pci/drivers/ehci_hcd/ sudo sh -c 'find ./ -name "0000:00:*" -print| sed "s/\.\///">unbind' |