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 12:22:57 325
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 20:39:12 413
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Find the 10 users that take up the most disk space

In OSX you would have to make sure that you "sudo -s" your way to happiness since it will give a few "Permission denied" errors before finally spitting out the results. In OSX the directory structure has to start with the "Users" Directory then it will recursively perform the operation. Your Lord and master, Mematron

Remove a line from a file using sed (useful for updating known SSH server keys when they change)

Display kernel profile of currently executing functions in Solaris.

Lockstat will sample the kernel 977 times per second, and print out the functions that it sees executing on the CPU during the sample. The -s 10 switch tells lockstsat to not only print that function, but also show the call stack (up to 10 deep).

Remove leading zeros in multiple columns with sed

Leading zeros might help correct sorting and they can be removed by sed after sorting

Find writable files

Have a grudge against someone on your network? Do a "find -writable" in their directory and see what you can vandalize! But seriously, this is really useful to check the files in your own home directory to make sure they can't inadvertently be changed by someone else's wayward script.

Adding Color Escape Codes to global CC array for use by echo -e

I was looking for the fastest way to create a bunch of ansi escapes for use in echo -e commands throughout a lot of my shell scripts. This is what I came up with, and I actually stick that loop command in a function and then just call that at the beginning of my scripts to not clutter the environment with these escape codes, which can wreck havok on my terminal when I'm dumping the environment. More of a cool way to store escape ansi codes in an array. You can echo them like: $ echo -e "${CC[15]}This text is black on bright green background." I usually just use with a function: $ # setup_colors - Adds colors to array CC for global use $ # 30 - Black, 31 - Red, 32 - Green, 33 - Yellow, 34 - Blue, 35 - Magenta, 36 - Blue/Green, 37 - White, 30/42 - Black on Green '30\;42' $ function setup_colors(){ declare -ax CC; for i in `seq 0 7`;do ii=$(($i+7));CC[$i]="\033[1;3${i}m";CC[$ii]="\033[0;3${i}m";done;CC[15]="\033[30;42m"; export R='\033[0;00m';export X="\033[1;37m"; }; $ export -f setup_colors CC[15] has a background of bright green which is why it is separate. R resets everything, and X is my default font of bright white. $ CC[15]="\033[30;42m"; R=$'\033[0;00m'; X=$'\033[1;37m' Those are just my favorite colors that I often use in my scripts. You can test which colors by running $ for i in $(seq 0 $((${#CC[@]} - 1))); do echo -e "${CC[$i]}[$i]\n$R"; done See: http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html for more usage.

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Fill up disk space (for testing)

Put into some file. No special purpouse, just for fun...

GZip all files in a directory separately

It gzip each file in a directory separately

ssh autocomplete based on ~/.ssh/config

I sue this in my .bashrc file This will also do auto-completion for scp and sftp

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Commands tagged Linux (266)

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