User:Scott/02

Tech Support

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Home Page      user:scott
Tech Support   user:scott/02
Dir & Files    user:scott/03
Network        user:scott/04
Troubleshoot   user:scott/05
Laptops        user:scott/06
Resources      user:scott/07
Notes          user:scott/08 

Password

Backup Password

• cp /etc/shadow /etc/shadow.bak - (hash of root + user)
• cat /etc/passwd (UID + GID)

Change Password

passwd [username]
passwd –e [username] – (change on startup)

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User Name (Add-Delete)

adduser [username]
adduser [username] admin
userdel [username]

Updates & Broken Packages

apt-get update
apt-get dist-upgrade

apt-get install --fix-broken
apt-get autoremove
apt-get install ubuntu-desktop

apt-get purge xxx

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File System Check

fdisk -l

fsck -fyv /dev/sda1 (f=force y=fix)

shutdown -rF now (reboot, forcing fsck on root filesystem)

Mount & Un-Mount

df -h          (show partition booted from)
ls /media      (mounted from GUI)
cat /etc/fstab (partitions and devices = mount on start-up)

mount /dev/sdb1 /mnt/xxx

umount /dev/sdb1 (sudo)

Mount fstab

un-mount drive (close apps using drive first)

sudo mkdir /media/sjn8GigMount

sudo fdisk -l or Disk utility to get "Device Name" such as (/dev/sdc1)

gksudo gedit /etc/fstab

select Edit -> Preferences -> Editor
create a backup copy before saving file

Mount Windows - NTFS disk (on tsbackup)

sudo ntfs-config (open + and dbl clk on device)
see - "Mounting_Disks.README" on Desktop

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Badblocks

badblocks -nvs /dev/sda1

Backup Home Directory

• date (e.g. 20121223 for Dec 23 2012)

ssh to tsbackup

ssh XC tsbackup@tsbackup.fglan nautilus
ctrl-c (to back-out)

rsync

sudo cp /etc/passwd /etc/shadow /etc/group /home/
dpkg --get-selections > dpkg.out
sudo mv dpkg.out /home/
sudo tar -czf /home/etc.backup.tar.gz /etc/
sudo rsync -avzh /home/ tsbackup@tsbackup:/var/tsbackup/[date-ticketnumber] 2>rsync.log

less rsync.log (view error log)

Note: on the '''data recovery box''' 
      add /mnt/sdb1 in front of /home 
      this avoids the need to chroot.

dpkg --get-selections --admindir=/mnt/sdb1/var/lib/dpkg >dpkg.out

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Restore (from backup)

sudo rsync -avzh  tsbackup@tsbackup:/var/tsbackup/[date-ticketnumber]/ /home
sudo dpkg --set-selections < /home/dpkg.out
sudo apt-get -u dselect-upgrade

copy (user passwd) hash from original /etc/shadow

Restore (user permissions)

• Create a New User (oem or Bob or Mark) - with Admin. Privileges
  • drwxr-xr-x 23 1001 1001 4096 2011-07-07 13:28 oem

chown –R oem:oem /home/oem (recursively for all sub directories)

File Permissions

chmod 774 dir-name (dir)   rwxrwxr--
chmod 664 filename (files) rw-rw-r--

chmod ugo+rwx /dir/file
chmod ugo-rwx /dir/file

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Stress Test

• CPU Temperature

stress --cpu 8 --io 4 --vm  2 --vm-bytes 128M  --timeout 4h

(add --hdd 2 to stress the hard drive as well, though this shouldn't be necessary)

Temperature Test

while  true  ; do uptime ; sensors ; sleep 30s; done | tee temp_load.log

Load lm sensor "utility to read temp/fan" 
-from software center 

Hardware & Resource ID

lshw

sudo lshw (hardware config)

CPU

cat /proc/cpuinfo or more /proc/cpuinfo

Disk Usage

du -sh (-s disk usage)
du -sh /home/bob/Downloads/ (disk usage for Downloads)

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Available Memory

free –l (available memory)

cat /proc/meminfo

Devices

To see a list of devices currently in use

cat /proc/devices

AlsaMixer

alsamixer

Printer Linux Foundation

http://www.linuxfoundation.org/
Workgroups -> Open Printing -> Printers

HPLIP

http://hplipopensource.com/hplip-web/downloads.html

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WineHQ Database

http://www.winehq.org/

wineDB

Download-Wine