Commands using sudo sorted by votes

Commands using sudo (537)

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nmap check port
This is sample output - yours may be different.
0

sudo nmap -sU -p 53 8.8.8.8

aysadk · 2017-08-16 19:59:18 17
Set the date on one remove server to the date of another remote server

From a local node, retrieve the date from server A and set that time on server B. When ntpd is not an option and you need to get closest clock sync between two nodes Replace SRC_SRV with yout source server and DST_SRV with your destination server. You must have ssh access to both and sudo access to the the destination to set the date. Show Sample Output
This is sample output - yours may be different.
```
Wed Sep  6 15:10:17 UTC 2017
Wed Sep  6 15:03:43 UTC 2017
Wed Sep  6 15:03:43 UTC 2017
```
0

env TERM="$(ssh SRC_SRV "date"):TERM" ssh -t DST_SRV 'TS=${TERM%:*}; TERM=${TERM##*:}; export TS; date ; sudo date -s "$TS"; date'

sector6 · 2017-09-06 15:28:26 21
When you realise your AMI doesn't come with NTP
This is sample output - yours may be different.
0

AWS_DEFAULT_REGION="sa-east-1" jungle ec2 ls | grep midas | sort | cut -f4 | xargs -I {} ssh ubuntu@{} sudo apt-get install ntp -y

xymor · 2017-11-22 19:20:08 19
resume other user's screen session via su, without pty error

Only requires one `exit` to close session.
This is sample output - yours may be different.
0

sudo -iu {user} script -qc 'screen {screen_args}' /dev/null

vshih · 2018-02-01 23:20:10 22
hardcode dnsserver, no more rewriting of etc/resolv.conf

man NetworkManager.conf ... none: NetworkManager will not modify resolv.conf. This implies rc-manager unmanaged Show Sample Output
This is sample output - yours may be different.
```
[main]
dns=none
#plugins=ifcfg-rh,ibft
```
0

f="/etc/NetworkManager/NetworkManager.conf"; if ! grep ^dns $f > /dev/null; then sudo sed -i.bkp '/\[main\]/a dns=none' $f; fi

ksvnix · 2018-05-15 18:17:49 193
Check if loopback network interface is working
This is sample output - yours may be different.
0

sudo tcpdump -i lo -nv ip

Dmitry · 2018-05-16 12:23:12 191
Kill all processes that listen to ports begin with 50 (50, 50x, 50xxx,...)
This is sample output - yours may be different.
0

sudo netstat -plnt | grep :50 | awk '{print $7}' | awk -F/ '{print $1}' | xargs kill -9

hiepdev · 2018-06-07 01:42:49 233
Add a repo to pacman
This is sample output - yours may be different.
0

echo -e "\n[sublime-text]\nServer = https://download.sublimetext.com/arch/dev/x86_64" | sudo tee -a /etc/pacman.conf

HaoZeke · 2018-08-13 07:30:55 304

Added gdb & other usefull stuff Show Sample Output

sudo /usr/syno/bin/synogear install && sudo su

dbiesecke · 2019-03-30 03:45:12 35

Manually trim SSD

Trims left over file system data from SSD. This can be set as a mount option, but then IO performance decreases. I prefer to trim in a batch either on boot or every few weeks. Show Sample Output
This is sample output - yours may be different.
```
/: 372 GiB (399476387840 bytes) trimmed
```
0

sudo fstrim -v /

stinkerweed999 · 2019-07-16 23:41:56 39
iso to USB with dd and show progress status

Does the same but shows nicely progress in real time with correct Size in %. But also needs the packages sudo,dd,pv and dialog.
This is sample output - yours may be different.
0

image="file.iso";drive="/dev/null";sudo -- sh -c 'cat '"${image}"'|(pv -n -s $(stat --printf="%s" '"${image}"')|dd of='"${drive}"' obs=1M oflag=direct) 2>&1| dialog --gauge "Writing Image '"${image}"' to Drive '"${drive}"'" 10 70 7'

fries · 2019-07-25 11:11:45 228
Write shell script without opening an editor

In this example, I’m creating a wrapper for apt-get that assumes yes every time — but the command could be anything.
This is sample output - yours may be different.
0

sudo su -c “echo -e \”\x23\x21/usr/bin/sudo /bin/bash\napt-get -y \x24\x40\” > /usr/bin/apt-yes”

realkstrawn93 · 2019-09-19 16:28:33 135
Login history Mac OS X

2d - is a shortcut for a period back in time Show Sample Output
This is sample output - yours may be different.
```
2020-05-28 21:49:37.140751+0200
2020-05-28 23:15:00.242348+0200
2020-05-29 11:20:36.974778+0200
2020-05-29 13:59:04.477616+0200
2020-05-29 15:11:21.299773+0200
2020-05-29 17:55:59.941100+0200
2020-05-30 09:12:55.268262+0200
```
0

% sudo log show --style syslog --last 2d | awk '/Enter/ && /unlockUIBecomesActive/ {print $1 " " $2}'

Repie · 2020-05-30 07:27:17 106
Clear Cached Memory on Ubuntu

Clear Cached Memory on Ubuntu based distributions, and also display memory status. Please do not use this on a production machine unless you really really know what you are doing. Echo 3 is a kinder way of purging the memory, you can also use 'echo 2' or 'echo 1' if #1 You know what you are doing, and #2 refer to number 1 :-)
This is sample output - yours may be different.
0

sudo free && sync && sudo echo 3 | sudo tee /proc/sys/vm/drop_caches

tg0000 · 2021-09-13 16:45:20 584
Quickly add a new user to all groups the default user is in

an alternative to this one with only 2 processes https://www.commandlinefu.com/commands/view/25844/quickly-add-a-new-user-to-all-groups-the-default-user-is-in
This is sample output - yours may be different.
0

awk -F: '/^.+user1/{print $1}' /etc/group | xargs -n1 sudo adduser user2

ichbins · 2022-03-18 11:32:47 394
Clean or clean pacman and pamac cache
This is sample output - yours may be different.
0

sudo pacman -Scc && pamac clean -b

bugmenot · 2022-08-24 19:10:38 552

View your motherboard's ACPI tables (in Debian & Ubuntu)

In July 2008, there was an uproar over Foxconn motherboards feeding Linux installs incorrect ACPI information (http://ubuntu-virginia.ubuntuforums.org/showthread.php?t=869249). Foxconn has gladly corrected their mistake, but make sure it's not happening on your motherboard! After running the command, just view the 'dsdt.dsl' in any editor you like. Show Sample Output

-1

sudo aptitude -y install iasl && sudo cat /sys/firmware/acpi/tables/DSDT > dsdt.dat && iasl -d dsdt.dat

brettalton · 2009-02-15 23:13:50 13

Mac OS X (laptops ??) only : control hibernation state more easily from Terminal.app

sudo pmset -a hibernatemode 1 sets hiberate on. sudo pmset -a hibernatemode 0 sets hibernate off. from the pmset man page: 0001 (bit 0) enables hibernation; causes OS X to write memory state to hibernation image at sleep time. On wake (without bit 1 set) OS X will resume from the hibernation image. Bit 0 set (without bit 1 set) causes OS X to write memory state and immediately hibernate at sleep time. I often change my MacBook's sleep state. So I created a function for bash to make it a little easier. Usage: hibernate (on | off) "hibernate on" will set your laptop to hibernate if the lid is closed. "hibernate off" will set your laptop to sleep if the lid is closed. ### note : "proper" indentation isn't preserved on the website function hibernate() { case "${1}" in on) sudo pmset -a hibernatemode 1 echo Hibernate mode on. ;; off) sudo pmset -a hibernatemode 0 echo Hiberate mode off. ;; *) echo "I'm sorry Dave, but I can't do that." ;; esac } To make things easier, add the proper line in your /etc/sudoers file so that your user may invoke pmset without a password. Here's how mine looks: bwayne luna = NOPASSWD: /usr/bin/pmset Don't forget that you must edit sudoers with `sudo visudo` from Terminal.app, and not by another text editor. Sorry this is so Mac OS specific. Show Sample Output
This is sample output - yours may be different.
```
// if one uses the below function

bwayne@luna:~$ hibernate on
Hibernate mode on.
```
-1

sudo pmset -a hibernatemode 1

thebillywayne · 2009-06-20 22:52:10 8
Uninstall all MacPorts that are no longer active
This is sample output - yours may be different.
-1

sudo port installed | grep -v 'active\|The' | xargs sudo port uninstall

letterj · 2009-07-09 05:15:30 6
Update iptables firewall with a temp ruleset

If you don't save the rule set it won't be applied during a reboot
This is sample output - yours may be different.
-1

sudo iptables-restore < /etc/iptables.test.rules

kamiller · 2009-08-19 14:38:08 4
Recursive Ownership Change

This will change the ownership of /../../somedirectory as well as all its subdirectories so they will be be owned by user2 - typically used when a directory is owned by root:root
This is sample output - yours may be different.
-1

sudo chown -R user2:user2 /../../somedirectory

bkn390 · 2009-09-23 21:27:45 3
Enable passwordless login

It is safe when there is "PermitEmptyPasswords no" in /etc/ssh/sshd_config. This command is useful when there is no need to have a password.
This is sample output - yours may be different.
-1

sudo usermod -p $(mkpasswd '') user_id

ckclark · 2010-05-06 20:39:58 42
tail all logs opened by all java processes

Tail all logs that are opened by all java processes. This is helpful when you are on a new environment and you do not know where the logs are located. Instead of java you can put any process name. This command does work only for Linux. The list of all log files opened by java process: sudo ls -l $(eval echo "/proc/{$(echo $(pgrep java)|sed 's/ /,/')}/fd/")|grep log|sed 's/[^/]* //g'
This is sample output - yours may be different.
-1

sudo ls -l $(eval echo "/proc/{$(echo $(pgrep java)|sed 's/ /,/')}/fd/")|grep log|sed 's/[^/]* //g'|xargs -r tail -f

vutcovici · 2010-07-30 18:20:00 3
Enabling some DVD playback enhancements in Ubuntu

This command works at least in 9.04+
This is sample output - yours may be different.
-1

sudo sh /usr/share/doc/libdvdread4/install-css.sh

dddddsadasdasd · 2010-11-14 00:00:55 3
Replace duplicate files by hardlinks
This is sample output - yours may be different.
-1

fdupes -r -1 path | while read line; do j="0"; for file in ${line[*]}; do if [ "$j" == "0" ]; then j="1"; else sudo ln -f ${line// .*/} $file; fi; done; done

piti · 2011-03-07 11:16:09 6
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copy/mkdir and automatically create parent directories

The --parents option will cause cp or mkdir to automatically create the parent directory structure. $mkdir --parents /one/two/three/dir will create /one, /one/two, and /one/two/three as needed before creating dir. cp will copy files with their full directory structure into the target directory with this option. Thanks to Peter Leung at: http://linuxcommando.blogspot.com/2007/11/use-of-parents-flag-in-mkdir-and-c.html which has good examples of usage.

Extract .tar.lzma archive

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

locate a filename, make sure it exists and display it with full details

use the locate command to find files on the system and verify they exist (-e) then display each one in full details.

simplest calculator

Search for a process by name

ps and grep is a dangerous combination -- grep tries to match everything on each line (thus the all too common: grep -v grep hack). ps -C doesn't use grep, it uses the process table for an exact match. Thus, you'll get an accurate list with: ps -fC sh rather finding every process with sh somewhere on the line.

calculate in commandline with bash

Only works for integer arithmetic.

use SHIFT + ALT to toggle between two keyboard layouts

change the last two-character abbreviation to any layout abbreviation you want. This command will only run in the current session, add to your ~/.bashrc to make this permanent.

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

Look for English words in /dev/urandom

Little faster alternative.

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Commands using sudo (537)

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