Commands using sudo sorted by votes

Commands using sudo (537)

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Simulate slow network connection locally

Replace 500ms by the desired delay. To remove it: sudo tc qdisc del dev lo root netem delay 500ms
This is sample output - yours may be different.
7

sudo tc qdisc add dev lo root netem delay 500ms

caiosba · 2012-11-05 05:29:51 4
Change tha mac adresse

eth0 = the name of the interface 00:01:02:03:04:05 = the new mac adresse the same thing for wireless card $ sudo iwconfig eth1 hw ether 00:01:02:03:04:05
This is sample output - yours may be different.
6

sudo ifconfig eth0 hw ether 00:01:02:03:04:05

momitov · 2009-06-04 09:02:35 9
Visualizing system performance data
This is sample output - yours may be different.
6

(echo "set terminal png;plot '-' u 1:2 t 'cpu' w linespoints;"; sudo vmstat 2 10 | awk 'NR > 2 {print NR, $13}') | gnuplot > plot.png

grokskookum · 2009-09-23 16:40:13 12

Refresh the cache of font directory , usefull after you download font (.ttf or other) from various website and you don't want to reboot or relogin . Close your word processor before using the command , after the refresh reopen your word processor , new fonts is avaible ! Show Sample Output

This is sample output - yours may be different.

gnu@robby:~/.fonts$ sudo fc-cache -f -v
/usr/share/fonts: caching, new cache contents: 0 fonts, 4 dirs
/usr/share/fonts/X11: caching, new cache contents: 0 fonts, 6 dirs
/usr/share/fonts/X11/100dpi: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/X11/75dpi: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/X11/Type1: caching, new cache contents: 83 fonts, 0 dirs
/usr/share/fonts/X11/encodings: caching, new cache contents: 0 fonts, 1 dirs
/usr/share/fonts/X11/encodings/large: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/X11/misc: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/X11/util: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/cmap: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/truetype: caching, new cache contents: 0 fonts, 16 dirs
/usr/share/fonts/truetype/arphic: caching, new cache contents: 12 fonts, 0 dirs
/usr/share/fonts/truetype/freefont: caching, new cache contents: 12 fonts, 0 dirs
/usr/share/fonts/truetype/kochi: caching, new cache contents: 4 fonts, 0 dirs
/usr/share/fonts/truetype/latex-xft-fonts: caching, new cache contents: 7 fonts, 0 dirs
/usr/share/fonts/truetype/openoffice: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/thai: caching, new cache contents: 51 fonts, 0 dirs
/usr/share/fonts/truetype/ttf-arabeyes: caching, new cache contents: 39 fonts, 0 dirs
/usr/share/fonts/truetype/ttf-bitstream-vera: caching, new cache contents: 10 fonts, 0 dirs
/usr/share/fonts/truetype/ttf-dejavu: caching, new cache contents: 21 fonts, 0 dirs
/usr/share/fonts/truetype/ttf-indic-fonts-core: caching, new cache contents: 11 fonts, 0 dirs
/usr/share/fonts/truetype/ttf-lao: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/ttf-liberation: caching, new cache contents: 12 fonts, 0 dirs
/usr/share/fonts/truetype/ttf-sil-yi: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/unfonts: caching, new cache contents: 4 fonts, 0 dirs
/usr/share/fonts/truetype/unifont: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/wqy: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/type1: caching, new cache contents: 0 fonts, 1 dirs
/usr/share/fonts/type1/gsfonts: caching, new cache contents: 35 fonts, 0 dirs
/usr/share/X11/fonts: skipping, no such directory
/usr/local/share/fonts: caching, new cache contents: 0 fonts, 0 dirs
/home/gnu/.fonts: caching, new cache contents: 31 fonts, 0 dirs
/usr/share/texmf/fonts/type1/public/lm: caching, new cache contents: 92 fonts, 0 dirs
/usr/share/fonts/truetype/ttf-malayalam-fonts: skipping, no such directory
/var/cache/fontconfig: cleaning cache directory
/home/gnu/.fontconfig: cleaning cache directory
fc-cache: succeeded

sudo fc-cache -f -v

eastwind · 2009-10-07 11:01:29 8

Disable the ping response

It really disables all ICMP responses not only the ping one. If you want to enable it you can use: sudo -s "echo 0 > /proc/sys/net/ipv4/icmp_echo_ignore_all"
This is sample output - yours may be different.
6

sudo -s "echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_all"

sliceoflinux · 2010-06-22 19:16:43 14
Auto Get Missing Launchpad Keys

You can choose these mirror servers to get gpg keys, if the official one ever goes offline keyserver.ubuntu.com pool.sks-keyservers.net subkeys.pgp.net pgp.mit.edu keys.nayr.net keys.gnupg.net wwwkeys.en.pgp.net #(replace with your country code fr, en, de,etc)
This is sample output - yours may be different.
6

sudo apt-get update 2> /tmp/keymissing; for key in $(grep "NO_PUBKEY" /tmp/keymissing |sed "s/.*NO_PUBKEY //"); do echo -e "\nProcessing key: $key"; gpg --keyserver pool.sks-keyservers.net --recv $key && gpg --export --armor $key |sudo apt-key add -; done

Bonster · 2011-03-30 08:18:54 8
Protect directory from an overzealous rm -rf *

-R Recursively change attributes of directories and their contents. +i to set the immutable bit to prevent even root from erasing or changing the contents of a file.
This is sample output - yours may be different.
6

sudo chattr -R +i dirname

mamue · 2011-05-17 05:05:49 6
View files opened by a program on startup and shutdown

Run this before you run a command in order to see what the command does as it starts. The -c flag is useful here as the PID is unknown before startup. All config files, libraries, logs, ports, etc used by the command as it starts up, (and shuts down) will be captured at 1s intervals and written to a file. Useful for debugging etc. Show Sample Output
This is sample output - yours may be different.
```
sudo lsof -rc httpd >> /tmp/FILE
```
6

sudo lsof -rc command >> /tmp/command.txt

zlemini · 2011-08-03 20:19:53 5
what model of computer I'm using?
This is sample output - yours may be different.
6

sudo hal-get-property --udi /org/freedesktop/Hal/devices/computer --key 'system.hardware.product'

0disse0 · 2012-02-06 19:43:57 6
Erase to factory a pendrive, disk or memory card, and watch the progress
This is sample output - yours may be different.
6

sudo shred -vz -n 0 /dev/sdb

bugmenot · 2012-08-06 22:37:44 5
Cleanup Docker

# Delete all containers docker rm $(docker ps -a -q) # Delete all images docker rmi $(docker images -q)
This is sample output - yours may be different.
6

sudo docker rm $(docker ps -a -q); sudo docker rmi $(docker images -q)

lpalgarvio · 2015-05-20 12:34:40 34
list block devices

Shows all block devices in a tree with descruptions of what they are.
This is sample output - yours may be different.
6

sudo lsblk -o name,type,fstype,label,partlabel,model,mountpoint,size

bugmenot · 2018-04-25 00:16:39 164
Save a copy of all debian packages in the form in which they are installed and configured on your system

A copy of all installed debian packages on your system will be put back together, with all changes in configuration files you made and placed in the current directory. Make sure you have enough disk space (say 2-3 GB). Break any time with Ctrl+C. Show Sample Output
This is sample output - yours may be different.
```
$ ls -1
accountsservice_0.6.45-1ubuntu1.3_amd64.deb
acl_2.2.52-3build1_amd64.deb
acpid_2.0.28-1ubuntu1_amd64.deb
acpi-support_0.142_amd64.deb
...
^C
(Ctrl+C)
```
6

for a in $(sudo dpkg --get-selections|cut -f1); do dpkg-repack $a|awk '{if (system("sleep .5 && exit 2") != 2) exit; print}';done

knoppix5 · 2021-01-17 17:07:02 333
Switch to a user with "nologin" shell

You need sudo privileges for this command. Replace username with actual username.
This is sample output - yours may be different.
5

sudo -u username bash

troelskn · 2009-02-06 00:52:18 22
Remount root in read-write mode.

Saved my day, when my harddrive got stuck in read-only mode.
This is sample output - yours may be different.
5

sudo mount -o remount,rw /

blindgaenger · 2009-03-01 13:36:05 9
Play musical notes from octave of middle C

Are there any creative pieces of music that can be created using beep and the shell? I'd love to hear it!
This is sample output - yours may be different.
5

man beep | sed -e '1,/Note/d; /BUGS/,$d' | awk '{print $2}' | xargs -IX sudo beep -f X -l 500

jnash · 2009-04-01 06:48:48 10
Follow the most recently updated log files

This command finds the 5 (-n5) most frequently updated logs in /var/log, and then does a multifile tail follow of those log files. Alternately, you can do this to follow a specific list of log files: sudo tail -n0 -f /var/log/{messages,secure,cron,cups/error_log} Show Sample Output
This is sample output - yours may be different.
```
==> /var/log/cron <==

==> /var/log/messages <==

==> /var/log/lastlog <==

==> /var/log/wtmp <==

==> /var/log/secure <==

==> /var/log/lastlog <==

==> /var/log/wtmp <==
&#65533;1pts/4ts/4myusermyhost.example.com&#65533;fJ&#65533;&#65533;?
==> /var/log/secure <==
Jul 21 18:36:19 thost sshd[12730]: Accepted password for myuser from 192.168.100.7 port 50066 ssh2
Jul 21 18:36:19 thost sshd[12730]: pam_unix(sshd:session): session opened for user myuser by (uid=0)
```
5

ls -drt /var/log/* | tail -n5 | xargs sudo tail -n0 -f

kanaka · 2009-07-22 14:44:41 22
Clone IDE Hard Disk

This command clone the first partition of the primary master IDE drive to the second partition of the primary slave IDE drive (!!! back up all data before trying anything like this !!!)
This is sample output - yours may be different.
5

sudo dd if=/dev/hda1 of=/dev/hdb2

0disse0 · 2009-09-05 09:16:52 4
Install a LAMP server in a Debian based distribution

The execution of this command will install a LAMP server (Linux, Apache, MySQL and PHP) in a Debian based distribution. For example, in Ubuntu.
This is sample output - yours may be different.
5

sudo tasksel install lamp-server

sliceoflinux · 2009-09-26 08:15:03 8
Disable beep sound from your computer

This command will disable the beep sound from the PC speaker.
This is sample output - yours may be different.
5

echo "blacklist pcspkr"|sudo tee -a /etc/modprobe.d/blacklist.conf

sliceoflinux · 2009-09-27 11:42:47 5
set your ssd disk as a non-rotating medium

if you still get a permissions error using sudo, then nano the file: sudo nano -w /sys/block/sdb/queue/rotational and change 1 to 0 this thread: http://www.ocztechnologyforum.com/forum/showpost.php?p=369836&postcount=15 says that this will "help the block layer to optimize a few decisions"
This is sample output - yours may be different.
5

sudo echo 0 > /sys/block/sdb/queue/rotational

nickleus · 2009-11-27 12:16:17 10
Sync the date of one server to that of another.

(Useful when firewalls prevent you from using NTP.)
This is sample output - yours may be different.
5

sudo date -s "$(ssh user@server.com "date -u")"

rpavlick · 2010-03-31 11:59:27 4

network usage per process

Nethogs groups bandwidth by process. Show Sample Output

sudo nethogs eth0

totti · 2013-01-25 08:20:44 6

dd with progress bar and statistics to gzipped image
This is sample output - yours may be different.
5

sudo dd if=/dev/sdc bs=4096 | pv -s `sudo mount /dev/sdc /media/sdc && du -sb /media/sdc/ |awk '{print $1}' && sudo umount /media/sdc`| sudo dd bs=4096 of=~/USB_BLACK_BACKUP.IMG

juanmi · 2013-02-06 09:29:10 7
Synchronize date and time with a server over ssh

Set Remote Server Date using Local Server Time (push) Show Sample Output
This is sample output - yours may be different.
```
Thu Mar 26 20:24:35 UTC 2015
```
5

ssh user@server sudo date -s @`( date -u +"%s" )`

daryltucker · 2015-03-26 20:25:23 11
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Find the process you are looking for minus the grepped one

faster ;) but your idea is really cool

dd with progress bar and statistics

Uses the pv utility to show progress of data transfer and an ETA until completion. You can install pv via Homebrew on macOS

Copy a file using dc3dd and watch its progress (very nice alternative to dd)

Requires the dc3dd package - available at http://dc3dd.sourceforge.net

Check to make sure the whois nameservers match the nameserver records from the nameservers themselves

Change the $domain variable to whichever domain you wish to query. Works with the majority of whois info; for some that won't, you may have to compromise: domain=google.com; for a in $(whois $domain | grep "Domain servers in listed order:" --after 3 | grep -v "Domain servers in listed order:"); do echo ">>> Nameservers for $domain from $a

Create QR codes from a URL.

QR codes are those funny square 2d bar codes that everyone seems to be pointing their smart phones at. Try the following... $ qrurl http://xkcd.com Then open qr.*.png in your favorite image viewer. Point your the bar code reader on your smart phone at the code, and you'll shortly be reading xkcd on your phone. URLs are not the only thing that can be encoded by QR codes... short texts (to around 2K) can be encoded this way, although this function doesn't do any URL encoding, so unless you want to do that by hand it won't be useful for that.

Generate an XKCD #936 style 4 word password

4 random words are better than one obfuscated word http://xkcd.com/936/

See why a program can't seem to access a file

Sometimes a program refuses to read a file and you're not sure why. You may have display_errors turned off for PHP or something. In this example, fopen('/var/www/test/foo.txt') was called but doesn't have read access to foo.txt. Strace can tell you what went wrong. E.g., if php doesn't have read access to the file, strace will say "EACCESS (Permission denied)". Or, if the file path you gave doesn't exist, strace will say "ENOENT (No such file or directory)", etc. This works for any program you can run from the command-line, e.g., strace python myapp.py -e open,access... Note: the above command uses php-cli, not mod_php, which is a different SAPI with diff configs, etc.

Get the size of all the directories in current directory

Find usb device

I often use it to find recently added ou removed device, or using find in /dev, or anything similar. Just run the command, plug the device, and wait to see him and only him

Print number of mb of free ram

Here we instead show a more real figure for how much free RAM you have when taking into consideration buffers that can be freed if needed. Unix machines leave data in memory but marked it free to overwrite, so using the first line from the "free" command will mostly give you back a reading showing you are almost out of memory, but in fact you are not, as the system can free up memory as soon as it is needed. I just noticed the free command is not on my OpenBSD box.

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Commands using sudo (537)

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