Commands tagged Linux sorted by votes

Commands tagged Linux (266)

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Quick key/value display within /proc or /sys

Within /proc and /sys there are a lot of subdirectories, which carry pseudofiles with only one value as content. Instead of cat-ing all single files (which takes quite a time) or do a "cat *" (which makes it hard to find the filename/content relation), just grep recursively for . or use "grep . /blabla/*" (star instead of -r flag). For better readability you might also want to pipe the output to "column -t -s : ". Show Sample Output

grep -r . /sys/class/net/eth0/statistics

olorin · 2009-08-05 08:20:39 3

Convert encoding of given files from one encoding to another
This is sample output - yours may be different.
4

iconv -f utf8 -t utf16 /path/to/file

imsaar · 2009-12-01 21:02:58 3
Extract title from HTML files

Case Insensitive! and Works even if the "<title>...</title>" spans over multiple line. Simple! :-) Show Sample Output
This is sample output - yours may be different.
```
Extract title from HTML files | commandlinefu.com
```
4

awk 'BEGIN{IGNORECASE=1;FS="<title>|</title>";RS=EOF} {print $2}' file.html

sata · 2010-04-20 10:54:03 5
Easily decode unix-time (funtion)

More recent versions of the date command finally have the ability to decode the unix epoch time into a human readable date. This function makes it simple to utilize this feature quickly. Show Sample Output
This is sample output - yours may be different.
```
$ utime 1000000000
Sat Sep  8 21:46:40 EDT 2001
```
4

utime { date -d @$1; }

deltaray · 2010-05-12 12:21:15 7
Stop or Start (Restart) a Windows service from a Linux machine

Control (stop, start, restart) a Windows Service from a Linux machine which has the `net` command (provided by samba). Show Sample Output
This is sample output - yours may be different.
```
..
SVCNAME service is stopped.
```
4

net rpc -I ADDRESS -U USERNAME%PASSWORD service {stop|start} SVCNAME

f0rk · 2010-06-29 17:12:36 11
delay execution of a command that needs lots of memory and CPU time until the resources are available

[ 2000 -ge "$(free -m | awk '/buffers.cache:/ {print $4}')" ] returns true if less than 2000 MB of RAM are available, so adjust this number to your needs. [ $(echo "$(uptime | awk '{print $10}' | sed -e 's/,$//' -e 's/,/./') >= $(grep -c ^processor /proc/cpuinfo)" | bc) -eq 1 ] returns true if the current machine load is at least equal to the number of CPUs. If either of the tests returns true we wait 10 seconds and check again. If both tests return false, i.e. 2GB are available and machine load falls below number of CPUs, we start our command and save it's output in a text file. The ( ( ... ) & ) construct lets the command run in background even if we log out. See http://www.commandlinefu.com/commands/view/3115/ .
This is sample output - yours may be different.
4

( ( while [ 2000 -ge "$(free -m | awk '/buffers.cache:/ {print $4}')" ] || [ $(echo "$(uptime | awk '{print $10}' | sed -e 's/,$//' -e 's/,/./') >= $(grep -c ^processor /proc/cpuinfo)" | bc) -eq 1 ]; do sleep 10; done; my-command > output.txt ) & )

michelsberg · 2010-07-13 09:12:11 3
show framebuffer console modes to use in grub vga option

look at /boot/grub/menu.lst for somethig like: ## additional options to use with the default boot option, but not with the ## alternatives ## e.g. defoptions=vga=791 resume=/dev/hda5 ## defoptions=vga=795 # defoptions=vga=873 ## altoption boot targets option ## multiple altoptions lines are allowed ## e.g. altoptions=(extra menu suffix) extra boot options ## altoptions=(recovery) single # altoptions=(verbose mode) vga=775 debug # altoptions=(console mode) vga=ask # altoptions=(graphic mode) quiet splash # altoptions=(recovery mode) single vga=(decimal value) is framebuffer mode Show Sample Output
This is sample output - yours may be different.
```
02: None 00.0: 11001 VESA Framebuffer                           
  [Created at bios.464]
  Unique ID: rdCR.UvN0l5rPwN5
  Hardware Class: framebuffer
  Model: "NVIDIA GW-P/N@CVGD33320LQ0N5:0"
  Vendor: "NVIDIA Corporation"
  Device: "GW-P/N@CVGD33320LQ0N5:0"
  SubVendor: "NVIDIA"
  SubDevice: 
  Revision: "GW-CLK"
  Memory Size: 256 MB
  Memory Range: 0xe0000000-0xefffffff (rw)
  Mode 0x0300: 640x400 (+640), 8 bits
  Mode 0x0301: 640x480 (+640), 8 bits
  Mode 0x0303: 800x600 (+800), 8 bits
  Mode 0x0305: 1024x768 (+1024), 8 bits
...
  Mode 0x0352: 2048x1536 (+8192), 24 bits
  Config Status: cfg=new, avail=yes, need=no, active=unknown
```
4

sudo hwinfo --framebuffer

hute37 · 2010-10-03 14:45:02 5

Get information on your graphics card on linux (such as graphics memory size)

Loop is needed if you have more then one card. Show Sample Output

for I in `/sbin/lspci |awk '/VGA/{print $1}'`;do /sbin/lspci -v -s $I;done

houghi · 2010-10-26 19:02:26 6

SSH Auto-login with password

You need to install "sshpass" for this to work. apt-get install sshpass
This is sample output - yours may be different.
4

sshpass -p "YOUR_PASSWORD" ssh -o StrictHostKeyChecking=no YOUR_USERNAME@SOME_SITE.COM

o0110o · 2013-05-24 14:33:38 12
Fastest segmented parallel sync of a remote directory over ssh

Mirror a remote directory using some tricks to maximize network speed. lftp:: coolest file transfer tool ever -u: username and password (pwd is merely a placeholder if you have ~/.ssh/id_rsa) -e: execute internal lftp commands set sftp:connect-program: use some specific command instead of plain ssh ssh:: -a -x -T: disable useless things -c arcfour: use the most efficient cipher specification -o Compression=no: disable compression to save CPU mirror: copy remote dir subtree to local dir -v: be verbose (cool progress bar and speed meter, one for each file in parallel) -c: continue interrupted file transfers if possible --loop: repeat mirror until no differences found --use-pget-n=3: transfer each file with 3 independent parallel TCP connections -P 2: transfer 2 files in parallel (totalling 6 TCP connections) sftp://remotehost:22: use sftp protocol on port 22 (you can give any other port if appropriate) You can play with values for --use-pget-n and/or -P to achieve maximum speed depending on the particular network. If the files are compressible removing "-o Compression=n" can be beneficial. Better create an alias for the command. Show Sample Output
This is sample output - yours may be different.
```
Transferring file `Maleficent.mkv'
`Maleficent.mkv', got 1890451456 of 9089412898 (20%) 6.82M/s eta:19m
ooooooo...............................ooooooo...............................ooooooo............

# the bar resembles the file being transferred, with 'o' representing data already received
```
4

lftp -u user,pwd -e "set sftp:connect-program 'ssh -a -x -T -c arcfour -o Compression=no'; mirror -v -c --loop --use-pget-n=3 -P 2 /remote/dir/ /local/dir/; quit" sftp://remotehost:22

colemar · 2014-10-17 00:29:34 10
Display full tree information of a single process
This is sample output - yours may be different.
4

pstree -plants $(pidof -s firefox)

cbrchrt · 2018-09-04 12:22:57 316
VMware Server print out the state of all registered Virtual Machines.

I use this command on my machines running VMware Server to print out the state of all registered Virtual machines. Show Sample Output
This is sample output - yours may be different.
```
/opt/vmware/vm1/vm1.vmx = on
/opt/vmware/vm2/vm2.vmx = on
/opt/vmware/vm3/vm3.vmx = off
/opt/vmware/vm4/vm4.vmx = on
```
3

for vm in $(vmware-cmd -l);do echo -n "${vm} ";vmware-cmd ${vm} getstate|awk '{print $2 " " $3}';done

dbart · 2009-02-26 16:45:04 8
Convert your favorite image in xpm for using in grub

* size must be 640?480 pixels * only has 14 colors * save it in XPM format Edit /boot/grub/menu.lst and add splashimage=(hd0,0)/boot/grub/grubimg.xpm make sure for your path name and hard disk
This is sample output - yours may be different.
3

convert image123.png -colors 14 -resize 640x480 grubimg.xpm

starchox · 2009-03-12 22:55:10 6
To have only unique lines in a file
This is sample output - yours may be different.
3

sort file1.txt | uniq > file2.txt

rain · 2009-03-14 20:24:06 17
find listening ports by pid

change 24073 to your pid Show Sample Output
This is sample output - yours may be different.
```
httpd 24073 TCP *:80 (LISTEN)
httpd 24073 TCP *:443 (LISTEN)
```
3

lsof -nP +p 24073 | grep -i listen | awk '{print $1,$2,$7,$8,$9}'

icreed · 2009-05-26 20:47:14 5
Remove newlines from output

Pipe any output to "grep ." and blank lines will not be printed.
This is sample output - yours may be different.
3

cat filename | grep .

fraktil · 2009-08-09 01:00:59 4
How many Linux and Windows devices are on your network?

Shows how many Windows and Linux devices are on your network. May add support for others, but that's all that are on my network right now. Show Sample Output
This is sample output - yours may be different.
```
3 Linux device(s)
2 Window(s) devices
```
3

sudo nmap -F -O 192.168.1.1-255 | grep "Running: " > /tmp/os; echo "$(cat /tmp/os | grep Linux | wc -l) Linux device(s)"; echo "$(cat /tmp/os | grep Windows | wc -l) Window(s) devices"

matthewbauer · 2010-01-10 03:09:56 5
Combining text files into one file
This is sample output - yours may be different.
3

cat *.txt >output.txt

jmcantrell · 2010-04-16 14:06:47 6
kills rapidly spawning processes that spawn faster than you can repeat the killall command

if you dont want to alias also then you can do killall rapidly_spawning_process ; !! ; !! ; !!
This is sample output - yours may be different.
3

alias a=" killall rapidly_spawning_process"; a; a; a;

raj77_in · 2010-05-20 02:33:28 3
Check your unread Gmail from the command line

Just an alternative with more advanced formating for readability purpose. It now uses colors (too much for me but it's a kind of proof-of-concept), and adjust columns. Show Sample Output
This is sample output - yours may be different.
```
John Doe (doe@example.net):              I have found the meaning of life !!!
Suzanne Johnson (suzanne@example.com):   What do you think about 42 ?
Mom (mom@house.ws):                      You didn't accept my facebook invitation
```
3

curl -u username --silent "https://mail.google.com/mail/feed/atom" | awk 'BEGIN{FS="\n";RS="(</entry>\n)?<entry>"}NR!=1{print "\033[1;31m"$9"\033[0;32m ("$10")\033[0m:\t\033[1;33m"$2"\033[0m"}' | sed -e 's,<[^>]*>,,g' | column -t -s $'\t'

frntn · 2011-10-15 23:15:52 3
Unmount all CIFS drives
This is sample output - yours may be different.
3

umount -a -t cifs

jameskirk · 2012-07-10 11:17:12 15
Remove all unused kernels with apt-get

Remove old kernels (*-generic and *-generic-pae) via apt-get on debian/ubuntu based systems. Tested on ubuntu 10.04 - 12.04.
This is sample output - yours may be different.
3

sudo apt-get remove $(dpkg -l|awk '/^ii linux-image-/{print $2}'|sed 's/linux-image-//'|awk -v v=`uname -r` 'v>$0'|sed 's/-generic*//'|awk '{printf("linux-headers-%s\nlinux-headers-%s-generic*\nlinux-image-%s-generic*\n",$0,$0,$0)}')

mtron · 2012-08-15 10:02:12 6
Command to rename multiple file in one go

An entirely shell-based solution (should work on any bourne-style shell), more portable on relying on the rename command, the exact nature of which varies from distro to distro.
This is sample output - yours may be different.
3

for f in ./*.xls; do mv "$f" "${f%.*}.ods"; done

evilsoup · 2013-09-17 01:41:56 6
Show the command line for a PID with ps

Show the command line for a PID with ps
This is sample output - yours may be different.
3

ps h -o %a 21679

BeniBela · 2015-09-27 11:00:07 13
Backup all starred repositories from Github
This is sample output - yours may be different.
3

GITUSER=$(whoami); curl "https://api.github.com/users/${GITUSER}/starred?per_page=1000" | grep -o 'git@[^"]*' | xargs -L1 git clone

wuseman1 · 2022-06-25 20:39:12 398
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Create a mirror of a local folder, on a remote server

Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

ssh and attach to a screen in one line.

If you know the benefits of screen, then this might come in handy for you. Instead of ssh'ing into a machine and then running a screen command, this can all be done on one line instead. Just have the person on the machine your ssh'ing into run something like $ screen -S debug Then you would run $ ssh -t user@host screen -x debug and be attached to the same screen session.

Use a decoy while scanning ports to avoid getting caught by the sys admin :9

Scan for open ports on the target device/computer (192.168.0.10) while setting up a decoy address (192.168.0.2). This will show the decoy ip address instead of your ip in targets security logs. Decoy address needs to be alive. Check the targets security log at /var/log/secure to make sure it worked.

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" }

Using json.tool from the shell to validate and pretty-print

Pass TAB as field separator to sort, join, cut, etc.

Use this BASH trick to create a variable containing the TAB character and pass it as the argument to sort, join, cut and other commands which don't understand the \t notation. $ sort -t $'\t' ... $ join -t $'\t' ... $ cut -d $'\t' ...

Find the package that installed a command

exim statistics about mails from queue

statistics are sorted based on number of recipients.

translate with google, get all translations

the google-api gives you only one translation which is sometimes insufficent. this function gives you all translations, so you can choose which one fits best.

Clear the terminal screen

works in /bin/bash

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Commands tagged Linux (266)

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