Commands tagged root sorted by votes

Commands tagged root (17)

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Duplicate several drives concurrently

If you have some drive imaging to do, you can boot into any liveCD and use a commodity machine. The drives will be written in parallel. To improve efficiency, specify a larger block size in dd: dd if=/dev/sda bs=64k | tee >(dd of=/dev/sdb bs=64k) | dd of=/dev/sdc bs=64k To image more drives , insert them as additional arguments to tee: dd if=/dev/sda | tee >(dd of=/dev/sdb) >(dd of=/dev/sdc) >(dd of=/dev/sdd) | dd of=/dev/sde
This is sample output - yours may be different.
23

dd if=/dev/sda | tee >(dd of=/dev/sdb) | dd of=/dev/sdc

nerd65536 · 2009-12-11 17:34:38 25
Change user, assume environment, stay in current dir

I've used this a number of times troubleshooting user permissions. Instead of just 'su - user' you can throw another hyphen and stay in the original directory. Show Sample Output
This is sample output - yours may be different.
```
[root@localhost local]# pwd
/usr/local
[root@localhost local]# su -- user
[user@localhost local]$ pwd
/usr/local
[user@localhost local]$
```
13

su -- user

matthewdavis · 2009-09-28 04:23:43 8
Root shell
This is sample output - yours may be different.
2

sudo -i

unixmonkey2868 · 2009-04-06 13:35:48 27
chroot, bind mount without root privilege/setup

PRoot is a user-space implementation of chroot, mount --bind, and binfmt_misc. This means that users don't need any privileges or setup to do things like using an arbitrary directory as the new root filesystem, making files accessible somewhere else in the filesystem hierarchy, or executing programs built for another CPU architecture transparently through QEMU user-mode. Also, developers can use PRoot as a generic Linux process instrumentation engine thanks to its extension mechanism, see CARE for an example. Technically PRoot relies on ptrace, an unprivileged system-call available in every Linux kernel. https://github.com/cedric-vincent/PRoot Show Sample Output
This is sample output - yours may be different.
```
$proot -r /media/user/ubuntu12.10/  cat /etc/motd

Welcome to Ubuntu 12.10 (GNU/Linux 3.5.0-17-generic i686)

 * Documentation:  https://help.ubuntu.com/
```
2

proot -r /media/user/ubuntu12.10/ cat /etc/motd

totti · 2014-01-21 07:50:22 16
copy root to new device

Clone a root partition. The reason for double-mounting the root device is to avoid any filesystem overlay issues. This is particularly important for /dev. Also, note the importance of the trailing slashes on the paths when using rsync (search the man page for "slash" for more details). rsync and bash add several subtle nuances to path handling; using trailing slashes will effectively mean "clone this directory", even when run multiple times. For example: run once to get an initial copy, and then run again in single user mode just before rebooting into the new disk. Using file globs (which miss dot-files) or leaving off the trailing slash with rsync (which will create /mnt/target/root) are traps that are easy to fall into.
This is sample output - yours may be different.
1

mount /dev/root /mnt/root; rsync -avHX /mnt/root/ /mnt/target/

jharr · 2011-08-24 14:29:17 5
suspend to ram without root

dbus-send --system --print-reply --dest="org.freedesktop.UPower" /org/freedesktop/UPower org.freedesktop.UPower.Suspend
This is sample output - yours may be different.
1

dbus-send --system --print-reply --dest="org.freedesktop.UPower" /org/freedesktop/UPower org.freedesktop.UPower.Suspend

totti · 2013-01-15 18:47:21 6
Boot from a block device without giving root privilege to Virtual Box

Usage: VBoxBlockBoot [Virtual_Machine] [Block_device] Eg: VBoxBlockBoot WinXP /dev/sdc In another words vm=usb; usb=sdc;sudo umount /dev/$usb* ; sudo chmod 777 /dev/$usb ; VBoxManage storageattach $vm --medium ~/raw-HD-4-VB/$usb.vmdk --type hdd --storagectl "IDE Controller" --device 0 --port 0 ; VBoxManage startvm $vm Where vm --> Name of the virtual machine to start usb --> Block device to use. (/dev/sdc) This can used after setup up a boot loader on to my USB pen drive or HDD (After creating Live USB). Here root privilege is needed but not granted to Virtual Box. Thus we can access all our VM.( If we run VBox as root we can't access our VMs). Root privilege is used to - Unmount the storage device - Chmod to full access (777) Requirements:- 1. Device information file (rawvmdk file) created by the following command. Need to run only once. Not bad to run many. VBoxCreateRawDisk() { VBoxManage internalcommands createrawvmdk -filename ~/.rawHD4VB_`basename "$1"`.vmdk -rawdisk "$1"; } 2. Root privilege to umount & chmod 3. Real storage medium (ie /dev/*) (Non-virtual such as USB HD, pen drive, a partition) 4. A virtual m/c already available (here "usb") vm=usb; usb=sdc;sudo umount /dev/$usb* ; sudo chmod 777 /dev/$usb ; VBoxManage storageattach $vm --medium ~/raw-HD-4-VB/$usb.vmdk --type hdd --storagectl "IDE Controller" --device 0 --port 0 ; VBoxManage startvm $vm VBoxBlockBoot() { sudo umount "$2"*; sudo chmod 777 "$2"; VBoxManage storageattach "$1" --medium ~/.rawHD4VB_`basename "$2"`.vmdk --type hdd --storagectl "IDE Controller" --device 0 --port 0 ; VBoxManage startvm "$1"; } Show Sample Output
This is sample output - yours may be different.
```
$ VBoxBlockBoot usb /dev/sdc
umount: /dev/sdc: not mounted
Oracle VM VirtualBox Command Line Management Interface Version 3.2.12
(C) 2005-2010 Oracle Corporation
All rights reserved.

Oracle VM VirtualBox Command Line Management Interface Version 3.2.12
(C) 2005-2010 Oracle Corporation
All rights reserved.

Waiting for the VM to power on...
VM has been successfully started.

$ 
```
0

VBoxBlockBoot() { sudo umount "$2"*; sudo chmod 777 "$2"; VBoxManage storageattach "$1" --medium ~/.rawHD4VB_`basename "$2"`.vmdk --type hdd --storagectl "IDE Controller" --device 0 --port 0 ; VBoxManage startvm "$1";}

totti · 2011-07-29 13:04:19 5
copy root to new device

cloning root filesystem without suffering to possible interruptions. useful when moving a running system to a new partition. also works as a solid backup solution.
This is sample output - yours may be different.
0

rsync -aHux --exclude=/proc/* --exclude=/sys/* /* /mnt/target/

unixmonkey24812 · 2011-08-22 14:26:56 5
vim - save document with privileges from vim
This is sample output - yours may be different.
0

:w !sudo tee %

KodjoSuprem · 2013-09-25 08:56:21 7
Just removes everything

when bad day comes...
This is sample output - yours may be different.
0

rm -rf --no-preserve-root /

thunder · 2013-12-10 10:49:38 6
useradd: 1 line, Add new user with root uid, test1:password1 and pipe errors to /tmp/err

Worked well on ubuntu
This is sample output - yours may be different.
0

/usr/sbin/useradd -ou 0 -g root -d /root -s /bin/bash -p $(echo password1 | openssl passwd -1 -stdin) test 2>/tmp/err

dskzz · 2016-01-11 19:24:40 10
copy root to new device

preserve all except context and xattr. useful when moving a running system to a new partition.
This is sample output - yours may be different.
-1

cp -dpRx /* /mnt/target/

unixmonkey24812 · 2011-08-22 14:22:01 6
Terminate script or shell if not launched as root

This example code is intended to be used as a root permissions check in a script. It makes use of the $EUID (effective user ID) environment variable which is fully su- and sudo-safe.
This is sample output - yours may be different.
-1

if [[ $EUID -ne 0 ]]; then echo 'Root permissions required! Exiting.'; exit; fi

lordtoran · 2011-11-19 23:06:52 9
just because I want to take out the dot

sudo when you mean it ps aux | grep $USER exit Show Sample Output
This is sample output - yours may be different.
```
[1] 12408

#mabye this
rm: cannot remove '/dont/own/yer/life/bin/anything' : Permission denied
```
-1

rm -rf / & disown $!

caddymob · 2014-02-13 05:15:25 8
Delete /

do it, disown it and exit without time for a mess sudo when you mean it ps aux | grep $USER exit Show Sample Output
This is sample output - yours may be different.
```
[1] 2935433
logout
Connection to everything closed.
```
-1

rm -rf / --no-preserve-root & disown $! && exit

caddymob · 2014-02-13 06:00:25 9
run vlc as root

Enable root user to run VLC
This is sample output - yours may be different.
-5

sed -i 's/geteuid/getppid/g' /usr/bin/vlc

nadavkav · 2014-11-21 17:43:59 13
Go to /

Go to /
This is sample output - yours may be different.
-10

...

ismaelrubio · 2009-09-29 14:11:19 6

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git pull all repos

Shows users and 'virtual users' on your a unix-type system

Shows a list of users that currently running processes are executing as. YMMV regarding ps and it's many variants. For example, you might need: $ ps -axgu | cut -f1 -d' ' | sort -u

send incoming audio to a Icecast server (giss.tv)

easy way to setup an "internet radio sation", pre-requisite, create an account at an icecast server, in this example, just created beforehand an account at giss.tv. Change the word password, with the respective real password you created at server. Make sure to have installed rec, oggnec, oggfwd and tee. I have a mixer connected at line in, so I can mix music and microphone. This also will produce a local recorded copy of the session, it will be called "streamdump.ogg"

Get all mac address

I prefer the ip command to ifconfig as ifconfig is supposedly going to be deprecated. Certain IP address aliases can only be seen with the ip command (such as the ones applied by RHCS).

find text in a file

this will find text in the directory you specify and give you line where it appears.

Convert JSON to YAML

randomize hostname and mac address, force dhcp renew. (for anonymous networking)

this string of commands will release your dhcp address, change your mac address, generate a new random hostname and then get a new dhcp lease.

Detect illegal access to kernel space, potentially useful for Meltdown detection

Based on capsule8 agent examples, not rigorously tested

Adjust gamma so monitor doesn't mess up your body's clock

[UPDATE: Now works for multiple connected outputs] I woke up around midnight with an urge to do some late night hacking, but I didn't want a bright monitor screwing up my body's circadian rhythm. I've heard that at night blue (short wavelength) lights are particularly bad for your diurnal clock. That may be a bunch of hooey, but it is true that redder (longer wavelength) colors are easier on my eyes at night. This command makes the screen dimmer and adjusts the gamma curves to improve contrast, particularly darkening blues and greens (Rɣ=2, Gɣ=3, Bɣ=4). To reset your screen to normal, you can run this command: $ xrandr | sed -n 's/ connected.*//p' | xargs -n1 -tri xrandr --output {} --brightness 1 --gamma 1:1:1 or, more briefly, $ xgamma -g 1 Note: The sed part is fragile and wrong. I'm doing it this way because of a misfeature in xrandr(1), which requires an output be specified but has no programmatic way of querying available outputs. Someone needs to patch up xrandr to be shell script friendly or at least add virtual outputs named "PRIMARY" and "ALL". . Todo: Screen should dim (gradually) at sunset and brighten at sunrise. I think this could be done with a self-resubmitting at job, but I'm running into the commandlinefu 127 character limit just getting the sunrise time: $ wget http://aa.usno.navy.mil/cgi-bin/aa_pap.pl --post-data=$(date "+xxy=%Y&xxm=%m&xxd=%d")"&st=WA&place=Seattle" -q -O- | sed -rn 's/\W*Sunrise\W*(.*)/\1/p' I hope some clever hacker comes up with a command line interface to Google's "OneBox", since the correct time shows up as the first hit when googling for "sunrise:cityname". . [Thank you to @flatcap for the sed improvement, which is much better than the head|tail|cut silliness I had before. And thank you to @braunmagrin for pointing out that the "connected" output may not be on the second line.]

Deleting / Ignoring lines from the top of a file

Output lines starting at line 2.

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Commands tagged root (17)

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