Commands

Copied from https://gist.github.com/plepe

mdadm

md: multiple devices
command description

 

show status of all raids

 

detailed status of raid md0

 

new raid /dev/md0 with 2 disks, raid level 1 on /dev/sda1 and /dev/sda2

 

remove /dev/sda1 from /dev/md0

 

add /dev/sda1 to /dev/md0

 

use 3 disks in raid /dev/md0 (e.g. add an additional disk, so a damaged drive can be removed later-on)

 

Assemble /dev/md0 (e.g. when running live system)

 

Update list of arrays in /etc/mdadm/mdadm.conf ; you should remove old list by hand first!

 

What is this disk / partition?

 

Set minimum raid rebuilding speed to 10000 kiB/s (default 1000)

 

Copy partition table from sdX to sdY (MBR only)

 

Copy partition table from sdX to sdY (GPT)

To boot a machine even with a degraded array, modify /etc/initramfs-tools/conf.d/mdadm and run update-initramfs -c -kall (Use with caution!)

LVM

pv: physical device (e.g. /dev/md0 or /dev/sda1)
vg: volume group (consists of 1 or more pvs, contains lvs); has a name (e.g. lvm)
lv: logical volume (has a name which defines its path, e.g. /dev/lvm/root which equals dev/mapper/lvm-root)
command description

 

initializes /dev/md0 as phys device for a volume group

 

create volume group lvm with phys device /dev/md0

 

create logical volume root, sized 30G in volume group lvm; format with ext4

 

extend /dev/lvm/root to 60G; also resize file system to new size

 

show short info about pv, vg and lv

 

show long info

scan disks for physical volumes (e.g. when running live system)

 

add phys device /dev/md1 to volume group lvm (need pvcreate first!)

 

move all logical volumes from /dev/md0 and remove phys device from volume group

Other
create bios grub partition

 

This is really old, but still helpful

  1. Basic scan:

     
  2. Scan multiple addresses:

     
  3. Scan entire subnet looking for valid hosts. This quick scan will also grab MAC address and perform MAC lookup to help determine what the host is.

     
  4.   Discovery:  Before a scan nmap will attempt to send an ICMP echo request.  To not send the ICMP, :

     
  5. To do only a ping scan:

     
  6. Do an ARP Ping scan:

     
  7. Port Scanning options:  Performing a Fast scan:

     
  8. Scan only specific ports:

     
  9. Scan multiple ports:

     
  10. Scan ports by name (found in /etc/services)

     
  11. Scan all ports:

     
  12. Choose between TCP and/or UDP:

     
  13. What OS is the target running?

     
  14. If the OS is unknown, have nmap attempt to guess the OS

     
  15. Service version detection

     

This will create a folder for each month 01-12.  Inside each month folder will be 30 or 31 folders for each day of the month except for Feb. which will have only 28.  This can be changed to 29 if it happens to be a leap-year.

 

 

All words only.

All words and digits

Sometimes piping to less on each is helpful depending on how big your file is.