Commands using echo sorted by votes

Commands using echo (1,545)

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du disk top 10

fancy command line ncdu clone Show Sample Output
This is sample output - yours may be different.
```
67 MB used by /var/log
42 MB used by /var/log/gdm
9 MB used by /var/log/ConsoleKit
2 MB used by /var/log/munin
1 MB used by /var/log/kismet
1 MB used by /var/log/dist-upgrade
0 MB used by /var/log/apache2
0 MB used by /var/log/installer
0 MB used by /var/log/vmware
0 MB used by /var/log/cups
```
7

for i in `du --max-depth=1 $HOME | sort -n -r | awk '{print $1 ":" $2}'`; do size=`echo $i | awk -F: '{print $1}'`; dir=`echo $i | awk -F: '{print $NF}'`; size2=$(($size/1024)); echo "$size2 MB used by $dir"; done | head -n 10

tuxifier · 2009-06-02 21:27:48 8
permanently let grep colorize its output

This will create a permanent alias to colorize the search pattern in your grep output
This is sample output - yours may be different.
7

echo alias grep=\'grep --color=auto\' >> ~/.bashrc ; . ~/.bashrc

0x2142 · 2009-07-05 07:44:13 7
Resets your MAC to a random MAC address to make you harder to find.

Next time you are leaching off of someone else's wifi use this command before you start your bittorrent ...for legitimate files only of course. It creates a hexidecimal string using md5sum from the first few lines of /dev/urandom and splices it into the proper MAC address format. Then it changes your MAC and resets your wireless (wlan0:0). Show Sample Output
This is sample output - yours may be different.
```
wlan0:0   Link encap:Ethernet  HWaddr 00:07:5a:df:41:5c  #<<-w00t new random MAC-<<#
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
```
7

ran=$(head /dev/urandom | md5sum); MAC=00:07:${ran:0:2}:${ran:3:2}:${ran:5:2}:${ran:7:2}; sudo ifconfig wlan0 down hw ether $MAC; sudo ifconfig wlan0 up; echo ifconfig wlan0:0

workingsmart · 2009-07-16 16:21:44 5
log your PC's motherboard and CPU temperature along with the current date

Uses the data in the /proc system, provided by the acpid, to find out the CPU temperature. Can be run on systems without lm-sensors installed as well. Show Sample Output
This is sample output - yours may be different.
```
08/25/0902:54:32 => 51 C
```
7

echo `date +%m/%d/%y%X |awk '{print $1;}' `" => "` cat /proc/acpi/thermal_zone/THRM/temperature | awk '{print $2, $3;}'` >> datetmp.log

ninadsp · 2009-08-24 21:26:29 33
convert unixtime to human-readable with awk

- convert unixtime to human-readable with awk - useful to read logfiles with unix-timestamps, f.e. squid-log: sudo tail -f /var/log/squid3/access.log | awk '{ print strftime("%c ", $1) $0; } Show Sample Output
This is sample output - yours may be different.
```
$ echo 1234567890 | awk '{ print strftime("%c", $0); }'
Sat 14 Feb 2009 12:31:30 AM CET
```
7

echo 1234567890 | awk '{ print strftime("%c", $0); }'

alvinx · 2009-08-25 09:37:54 6
Let your computer lull you to sleep

Can change language and speed, see espeak man page for options. (Install espeak in your linux distro via yum or apt-get) For insomniacs you may need to enclose in a while true; do ...; done loop ;) Show Sample Output
This is sample output - yours may be different.
```
1 sheep, 2 sheep, 3 sheep, ...

ZZZZZzzzzzzzzzz...
```
7

echo {1..199}" sheep," | espeak -v english -s 80

MrMerry · 2009-09-03 10:08:12 7
lotto generator
This is sample output - yours may be different.
7

echo $(shuf -i 1-49 | head -n6 | sort -n)

twfcc · 2009-10-22 06:48:20 4
Url Encode

Converts reserved characters in a URI to their percent encoded counterparts. Alternate python version: echo "$url" | python -c 'import sys,urllib;print urllib.quote(sys.stdin.read().strip())' Show Sample Output
This is sample output - yours may be different.
```
$ echo "this & that" | perl -MURI::Escape -ne 'chomp;print uri_escape($_),"\n"'
this%20%26%20that

$ echo "this & that" | python -c 'import sys,urllib;print urllib.quote(sys.stdin.read().strip())'
this%20%26%20that
```
7

echo "$url" | perl -MURI::Escape -ne 'chomp;print uri_escape($_),"\n"'

eightmillion · 2010-02-13 00:44:48 32
Reboot as a different OS in Grub

This will reboot as the Grub 2 option.
This is sample output - yours may be different.
7

echo "savedefault --default=2 --once" | grub --batch; sudo reboot

matthewbauer · 2010-05-02 03:06:23 4
find out how many days since given date

You can also do this for seconds, minutes, hours, etc... Can't use dates before the epoch, though. Show Sample Output
This is sample output - yours may be different.
```
$ echo $((($(date +%s)-$(date +%s -d "march 1"))/86400))
95
$ echo $((($(date +%s)-$(date +%s -d "sep 9 1986"))/86400))
8669
```
7

echo $((($(date +%s)-$(date +%s -d "march 1"))/86400))

recursiverse · 2010-06-04 21:41:07 3
stop man page content from disappearing on exit

stop man page content from disappearing on exit echo "export LESS='FiX'" >> ~/.bashrc man bash 'q'uit out of man page content will stay on screen Show Sample Output
This is sample output - yours may be different.
```
man bash
'q'uit out of man page
content will stay on screen
```
7

echo "export LESS='FiX'" >> ~/.bashrc

nottings · 2010-11-08 21:58:25 7
Random unsigned integer

works at least in bash. returns integer in range 0-32767. range is not as good, but for lots of cases it's good enough.
This is sample output - yours may be different.
7

echo $RANDOM

depesz · 2010-11-09 09:57:44 5
Command for JOHN CONS

Would create a file with a meaningful title. Dedicated to John Cons, who is annoying us users. Merry Christmas!!! Show Sample Output
This is sample output - yours may be different.
```
$ ls
```
7

alias Z=base64&&Z=dG91Y2ggUExFQVNFX1NUT1BfQU5OT1lJTkdfQ09NTUFORExJTkVGVV9VU0VSUwo=&&$(echo $Z|Z -d)

rodolfoap · 2010-12-24 14:29:19 18
Terminal Keyboard Shortcut list

This command will give you a list of available keyboard shortcuts according to stty. Show Sample Output
This is sample output - yours may be different.
```
Terminal shortcut keys

intr=Ctrl+C
quit=Ctrl+\
erase=Ctrl+?
kill=Ctrl+U
eof=Ctrl+D
eol=Shift+Ctrl+?
eol2=Shift+Ctrl+?
swtch=Shift+Ctrl+?
start=Ctrl+Q
stop=Ctrl+S
susp=Ctrl+Z
rprnt=Ctrl+R
werase=Ctrl+W
lnext=Ctrl+V
flush=Ctrl+O
```
7

echo -e "Terminal shortcut keys\n" && sed -e 's/\^/Ctrl+/g;s/M-/Shift+/g' <(stty -a 2>&1| sed -e 's/;/\n/g' | grep "\^" | tr -d ' ')

cicatriz · 2011-02-10 17:38:05 5
va - alias for editing aliases

When setting up a new aliases file, or having creating a new file.. About every time after editing an aliases file, I source it. This alias makes editing alias a bit easier and they are useful right away. Note if the source failed, it will not echo "aliases sourced". Sub in vi for your favorite editor, or alter for ksh, sh, etc.
This is sample output - yours may be different.
7

alias va='vi ~/.aliases; source ~/.aliases && echo "aliases sourced"'

greggster · 2011-03-10 06:41:37 5
Load average + API google chart

limite = threshold Show Sample Output
This is sample output - yours may be different.
```
http://chart.apis.google.com/chart?chxr=0,0,5&chxt=y&chs=700x240&cht=gm&chds=0,5&chd=t:0.52&chl=0.52&chtt=zappa+load+average
```
7

limite="5";load5=$(awk '{print $1}' /proc/loadavg);echo "http://chart.apis.google.com/chart?chxr=0,0,5&chxt=y&chs=700x240&cht=gm&chds=0,"$limite"&chd=t:"$load5"&chl="$load5"&chtt=$(hostname)+load+average"

ncaio · 2011-04-02 17:55:24 8
urldecoding with one pure BASH builtin

You can use ordinary printf to convert "%23%21%2fbin%2fbash" into "#!/bin/bash" with no external utilities, by using a little known printf feature -- the "%b" specifier converts shell escapes. Replace % with \x and printf will understand the urlencoded string. BASH's printf has an extension to set a variable directly, too. So you get to convert urlencoded strings from garble to plaintext in one step with no externals and no backticks. Show Sample Output
This is sample output - yours may be different.
```
#!/bin/bash
```
7

VAR="%23%21%2fbin%2fbash" ; printf -v VAR "%b" "${VAR//\%/\x}" ; echo $VAR

Corona688 · 2012-01-06 22:09:01 8
Search commandlinefu and view syntax-highlighted results in vim

Here is the full function (got trunctated), which is much better and works for multiple queries. function cmdfu () { local t=~/cmdfu; until [[ -z $1 ]]; do echo -e "\n# $1 {{{1" >> $t; curl -s "commandlinefu.com/commands/matching/$1/`echo -n $1|base64`/plaintext" | sed '1,2d;s/^#.*/& {{{2/g' | tee -a $t > $t.c; sed -i "s/^# $1 {/# $1 - `grep -c '^#' $t.c` {/" $t; shift; done; vim -u /dev/null -c "set ft=sh fdm=marker fdl=1 noswf" -M $t; rm $t $t.c } Searches commandlinefu for single/multiple queries and displays syntax-highlighted, folded, and numbered results in vim. Show Sample Output
This is sample output - yours may be different.
```
$ cmdfu mkfifo vim

# mkfifo - 7 {{{1
+---  3 lines: Share your terminal session real-time ---
+---  3 lines: execute a shell with netcat without -e ---
...

# vim - 25 {{{1
+---  3 lines: vim read stdin ---
+---  3 lines: Search commandlinefu.com and display with VIMs syntax highlighting! ---
...
```
7

cmdfu(){ local t=~/cmdfu;echo -e "\n# $1 {{{1">>$t;curl -s "commandlinefu.com/commands/matching/$1/`echo -n $1|base64`/plaintext"|sed '1,2d;s/^#.*/& {{{2/g'>$t;vim -u /dev/null -c "set ft=sh fdm=marker fdl=1 noswf" -M $t;rm $t; }

AskApache · 2012-02-21 05:43:16 11
guitar synthesizer in one line of C

outputs a f=220Hz guitar string sound (fifth string A) needs ALSA
This is sample output - yours may be different.
7

f=220;echo "int s=16e3/$f;main(i){unsigned char v[s];read(0,v,s);for(;;)putchar(v[i%s]=(v[i%s]+v[++i%s])/2);}"|gcc -x c -&&./a.out</dev/urandom|aplay -d 2

tehdog · 2013-06-28 14:52:53 9
Ping all hosts on 192.168.1.0/24

Pings all the hosts on 192.168.1.0/24 in parallel, so it is very fast. Alive host IP addresses are echoed to stdout as pings are responded to. Show Sample Output
This is sample output - yours may be different.
```
192.168.1.5
192.168.1.10
```
7

for i in {0..255} ; do (ping 192.168.1.$i -c 1 > /dev/null && echo "192.168.1.$i" & ) ; done

bugmenot · 2014-01-26 18:31:34 13
Scan all open ports without any required program
This is sample output - yours may be different.
7

for i in {1..65535}; do (echo < /dev/tcp/127.0.0.1/$i) &>/dev/null && printf "\n[+] Open Port at\n: \t%d\n" "$i" || printf "."; done

emphazer · 2019-05-21 09:34:15 51
Count the number of queries to a MySQL server
This is sample output - yours may be different.
6

echo "SHOW PROCESSLIST\G" | mysql -u root -p | grep "Info:" | awk -F":" '{count[$NF]++}END{for(i in count){printf("%d: %s\n", count[i], i)}}' | sort -n

bpfx · 2009-02-05 14:24:20 40
C one-liners

/lib/ld-linux.so.2 is the runtime linker/loader for ELF binaries on Linux. =(cmd) is a zsh trick to take the output for the command "inside" it and save it to a temporary file. echo -e 'blah' | gcc -x c -o /dev/stdout - pipes the C source to gcc. -x c tells gcc that it's compiling C (which is required if it's reading from a pipe). -o /dev/stdout - tells it to write the binary to standard output and read the source from standard input. because of the the =() thing, the compiled output is stashed in a tempfile, which the loader then runs and executes, and the shell tosses the tempfile away immediately after running it. Show Sample Output
This is sample output - yours may be different.
```
c one liners
```
6

/lib/ld-linux.so.2 =(echo -e '#include <stdio.h>\nint main(){printf("c one liners\\n");}' | gcc -x c -o /dev/stdout -)

mrtheplague · 2009-02-20 06:06:29 46
Quickly add user accounts to the system and force a password change on first login

This command is a bit Linux specific, as --stdin doesn't exist for passwd on many Unix machines. Further, useradd is high level in most distributions and Unix derivatives except for the Debian family of distros, where adduser would be more appropriate. The last bit, with chage, will force the user to change their password on new login.
This is sample output - yours may be different.
6

for name in larry moe schemp; do useradd $name; echo 'password' | passwd --stdin $name; chage -d 0 $name; done

atoponce · 2009-03-15 12:02:39 19
eth-tool summary of eth# devices

Give the Speed and Link status of eth# 0-3. This is sort of what mii-tool does, but eth-tool is better, yet lacks device discovery. Show Sample Output
This is sample output - yours may be different.
```
eth0
        Speed: Unknown! (65535)
        Link detected: no
eth1
        Speed: Unknown! (65535)
        Link detected: no
eth2
        Speed: 1000Mb/s
        Link detected: yes
eth3
        Speed: Unknown! (65535)
        Link detected: no
```
6

for M in 0 1 2 3 ; do echo eth$M ;/sbin/ethtool eth$M | grep -E "Link|Speed" ; done

Wubby · 2009-04-22 19:32:41 9
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Rapidly invoke an editor to write a long, complex, or tricky command

New command with the last argument of the previous command.

kill ip connection

needed; apt-get install tcpkill

Getting a domain from url, ex: very nice to get url from squid access.log

Play music from youtube without download

bash screensaver (scrolling ascii art with customizable message)

Displays a scrolling banner which loops until you hit Ctrl-C to terminate it. Make sure you finish your banner message with a space so it will loop nicely.

Create a self-signed certificate for Apache Tomcat

Must be run as root. The 'tomcat' user must have access to the .keystore file. The key and keystore passwords must be the same. The password must be entered into the server.xml config file for Tomcat.

find external links in all html files in a directory list

Just a handy way to get all the unique links from inside all the html files inside a directory. Can be handy on scripts etc.

Convert entire audio library in parallel

Uses parallel processing Reiteration of my earlier command https://www.commandlinefu.com/commands/view/15246/convert-entire-music-library Usage lc Old_Directory New_DIrectory Old_Format New_Format lc ~/Music ~/Music_ogg mp3 ogg

comment current line(put # at the beginning)

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Commands using echo (1,545)

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