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Move firefox profile and cache into RAM tmpfs.

Posted 11-22-2017 at 03:57 AM by number22
Updated 11-22-2017 at 10:48 AM by number22

Tags cache, firefox, profile, ram, tmpfs

Relocating firefox's profile and cache into tmpfs of RAM; speed up firefox and save your hard drive's lifespan and space.

Change XXXX.UserProfile to exactly to your path of course.

creating backup locations first:

Code:

mkdir ~/backup/firefox.profile
mkdir ~/backup/firefox.cache
chmod 700 ~/backup/firefox.*

edit your /etc/fstab add following lines files will be mounted on firefox original locations, profile and cache:

Code:

tmpfs  your_home/.mozilla/firefox/XXXX.UserProfile

...

number22

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Bootable PC-DOS usb drive

Posted 10-06-2016 at 09:23 PM by number22
Updated 10-07-2016 at 09:38 PM by number22

Tags syslinux dos ibmbio

We need a system to run old DOS program. Microsoft's Win98 lacks proper memory management for modem computer with larger amount memory. We have PC-DOS (from IBM) lay around.

Basic setup: Syslinux + floppy image with boot.bss

Need create a empty floppy image on usb drive.(your usb is already fdisk with FAT16 partition, and mkfs.msdos formatted).

Code:

#mount -t msdos /dev/usbpartition# /mnt/usb
#cd /mnt/usb
#dd bs=512 count=2880 if=/dev/zero of=fd0.img

...

number22

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keyboard or mouse mounted as ghost joystick

Posted 09-14-2016 at 12:15 PM by number22
Updated 09-15-2016 at 06:58 PM by number22 (spelling, format)

Tags joystick, keyboard, udev

Mouse cursor jumps randomly and having a hard time in some steam games. This problem is fixed by udev rules. find this link by google: udev keyboard joystick

https://github.com/denilsonsa/udev-joystick-blacklist

Modified its rules so the ghost joystick is unbinded from usbhid driver.

Code:

#Microsoft Corp. Basic Optical Mouse v2.0 power
ACTION=="add", SUBSYSTEM=="usb", ATTR{idVendor}=="0x045e", ATTR{idProduct}=="0x00cb",

...

number22

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ffmpeg alsa recording multiple applications audio

Posted 01-28-2016 at 10:56 PM by number22
Updated 02-07-2016 at 03:30 AM by number22

Tags alsa, dmix, html5, loopback, recording

The trick is using dmix on loopback device:
2 dmixers; one for regualr onboard audio; the other for loopback virtual device, then duplicates streams send to onboard audio card, so you can hear what is being sent to loopback device.

Need to load snd_aloop module first;

Code:

modprobe snd-aloop index=2 id=Loopback pcm_substreams=1 enable=1

My first audio device is onboard soundcard; 2nd is HDMI card, so I put index=2 for Loopback device.

file...

number22

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Recover from hard drive MBR corruption with LVM/LUKS partitions

Posted 11-12-2015 at 08:05 AM by number22
Updated 11-12-2015 at 08:08 AM by number22

Tags mbr luks lvm

Using latest version boot cd or usb rescue disk, which is created by usbboot.img from cd or ftp.slackware.com

create usbboot.img with dd command.(#dd if=usbboot.img of=/dev/sdb bs=1M) (clear usb disk #dd if=/dev/zero of=/dev/sdb bs=512).

once boot up:

# cryptsetup luksOpen /dev/sdxx luksname (sdxx your encrypted luks partition)

After successful enter password:

#vgscan --mknodes
#vgchange -ay
#mount /dev/cryptvg/root /mnt...

number22

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