Commands using echo sorted by votes

Commands using echo (1,545)

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displays the uptime in a friendly way

useful for human readable reports Show Sample Output
This is sample output - yours may be different.
```
murgatroyd restarted 4 days ago
```
0

echo "$HOSTNAME restarted $(uptime | tr , ' ' | awk '{print $3" "$4}') ago"

forestb · 2015-11-20 19:25:15 10
grep in .odt files

find '.odt' files that contain USAGE: grepodt
This is sample output - yours may be different.
0

grepodt () { W=$1;P=$2;ls *.odt > /dev/null 2>&1;if [[ $? -ne 0 ]];then exit 1;fi;if [[ ! "$P" ]];then P='*';fi;for i in $P.odt;do unzip -qq "$i" content.xml;grep -l $W content.xml>/dev/null;if [[ $? -eq 0 ]];then echo $i;fi;rm content.xml; done;}

roberto_scotti · 2015-12-09 20:37:52 10
Google Authenticator. Setup a user and email them a QR code.

Requirements: Google Authenticator is configured as per document (http://blogs.vmware.com/consulting/files/2015/02/VMW_15Q1_TD_Horizon-View-Google-Authenticator_021715_FINAL_EMonjoin.pdf) including the patch at the end of the document. Login as the user to be provisioned. su username Command will: 1. Silently provision a user for Google Authenticator (TOTP) 2. Remove the unnecessary (and unsecure) code that uses google.com to create the QR code in browser. 3. Decode URL (first instance) 4. Decode URL (second instance) 5. Create a QR code 6. Send email to an account with the QR Code attached User scans QR code with Google Authenticator.
This is sample output - yours may be different.
0

google-authenticator -tdfo -i "Company" -l "GAuth" -r 3 -R 30 -w 17 -Q UTF8 | cut -c 62- | sed -e's/%$[0-9A-F][0-9A-F]$/\\\\\x\1/g' | xargs echo -e | qrencode -o qrcode.png | sendemail -t user@domain.com -f sender@domain.com -u "QR" -a qrcode.png

mooves · 2015-12-14 06:52:08 12
Print all 256 colors for testing TERM or for a quick reference

Basically, \033[ is a semi-portable unix escape character. It should work in linux, osx, bsd, etc. The first option is 38. This tells whatever is interpreting this (and this is merely convention) that a special color sequence follows. The next option is 5 which says that the next option will specify a color ? {0..256} of course. These options, as you can see, are separated by a single `;` and the entire escape sequence is followed by a mandatory `m`. The second escape sequence (following "COLOR") is simply to clear all terminal attributes (for our purposes, it clears color). This for loop is helpful for testing all 256 colors in a 256 console (note: this will not work in a standard Linux tty console) or to see which number corresponds to which color so that perhaps you can use it! Show Sample Output
This is sample output - yours may be different.
```
1 COLOR
2 COLOR
...
255 COLOR
256 COLOR
```
0

for i in {0..256}; do echo -e "${i} \033[38;05;${i}m COLOR \033[0m"; done

Benharper · 2015-12-17 23:49:42 12
Shell to discover MTU using ping

Changelog: Changing ping to "ping -A -c1 -w10" - targeting a quick and reliable ping, even on slow networks.
This is sample output - yours may be different.
0

ADDR=127.0.0.1 ; for i in `seq 1300 1501`; do echo -ne "Pacote de tamanho $i bytes" ; ping -A -c1 -w10 -s $i -Mdo $ADDR 2>&1 > /dev/null || break ; echo -ne "\r\033[2K" ; done ; echo -ne "\r\033[2K" ; echo -e "MTU bem sucedido com `expr $i`"

pqatsi · 2015-12-18 18:11:47 11
GRUB2: Set Imperial Death March as startup tune
This is sample output - yours may be different.
0

echo "GRUB_INIT_TUNE=\"480 440 4 440 4 440 4 349 3 523 1 440 4 349 3 523 1 440 8 659 4 659 4 659 4 698 3 523 1 415 4 349 3 523 1 440 8\"" | sudo tee -a /etc/default/grub > /dev/null && sudo update-grub

EvilSupahFly · 2015-12-22 06:22:30 9
Powershell Curl Logs Signal Strength of Cable Modem

IMPORTANT: You need Windows PowerShell to run this command - in your Windows Command Prompt, type powershell Create a log file of your Motorola Surfboard SB6141 downstream signal strengths. Uses the built-in curl to request signal strength data from your SB6141 cable modem. HTML page 192.168.100.1/cmSignalData.htm has the signal strength numbers for the 8 downstreams. Some HTML/DOM processing parses out the 8 values from the above page. The eight extracted signal strengths are then logged to a file. A small while-loop watches the clock & repeats the process every 10 seconds. Show Sample Output
This is sample output - yours may be different.
```
PS C:\Users\user> type modemlog.txt
7:39:20 PM 1 dBmV  1 dBmV  1 dBmV  1 dBmV  0 dBmV  0 dBmV  -1 dBmV  -1 dBmV
7:39:30 PM 1 dBmV  1 dBmV  1 dBmV  1 dBmV  0 dBmV  0 dBmV  -1 dBmV  -1 dBmV
7:39:40 PM 1 dBmV  1 dBmV  1 dBmV  1 dBmV  0 dBmV  0 dBmV  -1 dBmV  -1 dBmV
7:39:50 PM 1 dBmV  1 dBmV  1 dBmV  1 dBmV  0 dBmV  0 dBmV  -1 dBmV  -1 dBmV
7:40:00 PM 1 dBmV  1 dBmV  1 dBmV  1 dBmV  0 dBmV  0 dBmV  -1 dBmV  -1 dBmV
7:40:10 PM 1 dBmV  1 dBmV  1 dBmV  1 dBmV  0 dBmV  0 dBmV  -1 dBmV  -1 dBmV
PS C:\Users\user>
```
0

while(1){while((date -f ss)%10-gt0){sleep -m 300} echo "$(date -u %s) $((curl 192.168.100.1/cmSignalData.htm).parsedhtml.body.childnodes.item(1).firstchild.firstchild.childnodes.item(5).outertext|%{$_ -replace '\D+\n',''})">>modemlog.txt;sleep 1;echo .}

omap7777 · 2015-12-24 02:12:10 11
Powershell Ping Logs Host Up/Down Events

IMPORTANT: You need Windows PowerShell to run this command - in your Windows Command Prompt, type powershell Uses sajb to start a PowerShell background job that pings an IP host every 10 seconds. Any changes in the host's Up/Down state is time-stamped and logged to a file. Date/time stamps are logged in two formats: Unix and human-readable. A while(1) loop repeats the test every 10 seconds by using the sleep command. See the Sample Output for more detail. I use this command to log Up/Down events of my Motorola SB6141 cable modem (192.168.100.1). To end the logging, close the PowerShell window or use the "exit" command. Show Sample Output
This is sample output - yours may be different.
```
C:\Users\user>powershell

Windows PowerShell (C) 2014 Microsoft Corporation.

PS C:\Users\user> sajb {$ip="192.168.100.1";$old=0;while(1){$up=test-connection -quiet -count 1 $ip;if($up-ne$old){$s=(date -u %s).split('.')[0]+' '+(
date -f s).replace('T',' ')+' '+$ip+' '+$(if($up){'Up'}else{'Down'});echo $s|out-file -a $home\ping.txt;$old=$up}sleep 10}}


Id  Name  PSJobTypeName   State    HasMoreData Location  Command
--  ----  -------------   -----    ----------- --------  -------
1   Job1  BackgroundJob   Run      True        localhost $ip="192.168.100.1"...

PS C:\Users\user> more $home\ping.txt

1451306247 2015-12-28 12:37:27 192.168.100.1 Up
1451306258 2015-12-28 12:37:38 192.168.100.1 Down
1451306263 2015-12-28 12:37:43 192.168.100.1 Up

PS C:\Users\user>
```
0

sajb {$ip="192.168.100.1";$old=0;while(1){$up=test-connection -quiet -count 1 $ip;if($up-ne$old){$s=(date -u %s).split('.')[0]+' '+(date -f s).replace('T',' ')+' '+$ip+' '+$(if($up){'Up'}else{'Down'});echo $s|out-file -a $home\ping.txt;$old=$up}sleep 10}}

omap7777 · 2015-12-28 20:33:08 15
Find out if the current year is a leap year in BASH
This is sample output - yours may be different.
0

y=$(date +%Y); if [ "$(($y % 100))" -eq "0" ] && [ "$(($y % 4))" -eq "0" ]; then echo "$y is a leap year"; else echo "$y is not a leap year"; fi

TheMadScientist · 2016-01-08 15:58:37 12
Get current position of the International Space Station in pulses of 1 second

Requires jq (JSON parser) and curl (wget could do the same with some changes)
This is sample output - yours may be different.
0

while true; do pos=$(curl -s "http://api.open-notify.org/iss-now.json"); echo "lat=$(echo $pos | jq ".iss_position.latitude"), lon=$(echo $pos | jq ".iss_position.longitude")"; sleep 1; done

TheMadScientist · 2016-01-08 16:32:34 10
useradd: 1 line, Add new user with root uid, test1:password1 and pipe errors to /tmp/err

Worked well on ubuntu
This is sample output - yours may be different.
0

/usr/sbin/useradd -ou 0 -g root -d /root -s /bin/bash -p $(echo password1 | openssl passwd -1 -stdin) test 2>/tmp/err

dskzz · 2016-01-11 19:24:40 10
CURL example to get records from CouchDB

Requires jq (JSON parser)
This is sample output - yours may be different.
0

clear; url="http://<addr>:<port>"; query="<view>"; echo "$url$(curl -s "$url$query" | jq -r '.rows[0].value')"

TheMadScientist · 2016-01-14 12:30:13 11
Dialog customization WITHOUT configuration file

e.g. OLDDIALOGRC=$DIALOGRC; export DIALOGRC=/dev/stdin; echo -e "screen_color = (CYAN,RED,ON)" | dialog --infobox "\nfoo bar" 5 11; export DIALOGRC=$OLDDIALOGRC Alternative: OLDDIALOGRC=$DIALOGRC; export DIALOGRC=/dev/stdin; printf "<configuration>\n" | dialog <options>; export DIALOGRC=$OLDDIALOGRC
This is sample output - yours may be different.
0

OLDDIALOGRC=$DIALOGRC; export DIALOGRC=/dev/stdin; echo -e "<configuration>" | dialog <options>; export DIALOGRC=$OLDDIALOGRC

rlebron · 2016-01-18 09:12:54 11
This command will check the file /etc/passwd existence

This command would execute echo "Yes" if the file /etc/passwd exits. Else would execute echo "No". This is a great command for make decisions based on file existence. Basically ?/usr/bin/[' or '[' is a test command in Linux. Show Sample Output
This is sample output - yours may be different.
```
Yes
```
0

[ -f /etc/passwd ] && echo "Yes" || echo "No"

ramya · 2016-01-21 11:04:48 11
list lines changed per all authors of a git repository
This is sample output - yours may be different.
0

for i in $(git log --format='%ae' | sort -u); do echo $i; git log --author="$i" --pretty=tformat: --numstat | awk '{ add += $1; subs += $2; loc += $1 - $2 } END { printf "added lines: %s, removed lines: %s, total lines: %s\n", add, subs, loc }' - done

flavioab · 2016-01-27 20:46:51 11
underscore to camelCase

Convert Underscore to CamelCase Show Sample Output
This is sample output - yours may be different.
```
ThisIsLargeExampleWithUpperCaseToo
```
0

echo "this_is_a_large_example_With_Upper_case_too" | sed -re 's/(_([a-zA-Z]))+([a-zA-Z]+)+/\U\2\L\3/g;s/(^[a-z])/\U\1/')

iharob · 2016-01-31 17:03:19 13
Read curl output line by line in a while loop

This command will take the output of curl and read it line by line, skipping a step in downloading the file then parsing it. You can then parse each line, or only print the lines that contain certain works using if statements, or whatever you can come up with. Or you can change IFS and use it to parse based on separators other than newline.
This is sample output - yours may be different.
0

while read line; do echo $line;done < <(curl -s <URL of file to read>)

baize · 2016-02-05 17:04:15 18
transfer lvm image to another host

1. Sends an email to announce the start of the command 2. Raw data copy of block device over ssh to a new host 3. Sends an email to announce the end of the command Make sure the lvm device at the other side exists and has the same amount of logical units.
This is sample output - yours may be different.
0

echo "dd start" | mail -s ready pete@example.com; dd if=/dev/system/machine-disk | ssh -c blowfish root@destination.example.com dd of=/dev/system/machine-disk ; echo "dd ready" | mail -s ready pete@example.com

mipmip · 2016-03-01 13:13:20 12
Shortcut to a lightweight detachable 'multi-windowed' terminal session

Adds a shortcut (bash alias) for a lightweight detachable 'multi-windowed' cli terminal session to bashrc. Uses 'abduco' (supersedes 'dtach') to implement a personal default detachable terminal session with a 'windowed' terminal UI provided by 'dvtm'. "-A" option allows the shortcut "wm" to be used to both instigate and re-attach to session "your_title_here". "-M" options stops 'dvtm' from changing your default mouse behavior.
This is sample output - yours may be different.
0

echo 'alias wm="abduco -A your_title_here dvtm -M"' >> ~/.bashrc

kevjonesin · 2016-03-06 07:42:38 13
Reports file systems with disk usage exceeding 90% on the specified host
This is sample output - yours may be different.
0

function df_func { local dfts=$(ssh $1 "df -lP | tail -n +2 | sed 's/%//'"); echo $dfts | awk '$5 > 90 {exit 1}' > /dev/null; if [ $? == 1 ]; then echo -n "$1 "; echo $dfts | awk '$5 > 90 {printf "%s %d%%\n", $6, $5}'; fi }

wytten12 · 2016-03-30 19:57:39 10
Optimize Google Chrome database speedup sqlite3

Speed up Google Chrome like speedyfox does for MAC USER. This script will detect all SQLITE DATABASE on the Google directory
This is sample output - yours may be different.
0

cd "/Users/$USER/Library/Application Support/Google" && find . -print|while read line;do (file "$line"|grep SQLite) && (sqlite3 "$line" "VACUUM;";echo "Compress");done;

c0derz · 2016-04-03 13:46:40 11
Get just LAN IP without all the extra stuff

I just needed to store the LAN IP (for ipv4) in a variable for a specific task in a bash script. I figured I'd share. I sent it to a variable with VAR=$(stuff) and used it later on. I put the exit 0 in the if statement to make it so that it breaks if there are more than one IPv4 addresses assigned. I only wanted the first one. Edit: Bear in mind, my network mask is a double digit number so if you have a smaller nw mask you'd need to edit the sed statement. Show Sample Output
This is sample output - yours may be different.
```
192.168.1.245
```
0

ip addr show | grep "inet " | while read INET IP TRASH; do if [ $IP != "127.0.0.1/8" ]; then echo $IP; exit 0; fi; done | sed s:/[1-9][1-9]:"":

Meh · 2016-04-07 17:46:20 11
Inverted cowsay

It's quite fun to invert text using "flip.pl" (ref: http://ubuntuforums.org/showthread.php?t=2078323 ). Slightly more challenging is to flip a whole "cowsay". :-) Show Sample Output
This is sample output - yours may be different.
```
$ echo Which way up? | flip.pl | cowsay | tac | sed -e "s,/,+,g" -e "s,\\\,/,g" -e "s,+,\\\,g" -e "s,_,-,g" -e "s,\^,v,g"
                ||     ||
                ||----w |
            (--)/       )/\/
         /  (oo)/-------
        /   v--v
 ------------------------ 
< ?dn &#654;&#592;&#653; &#613;&#596;&#305;&#613;&#653; >
 ------------------------ 
```
0

echo Which way up? | flip.pl | cowsay | tac | sed -e "s,/,+,g" -e "s,\\\,/,g" -e "s,+,\\\,g" -e "s,_,-,g" -e "s,\^,v,g"

mpb · 2016-04-08 11:41:44 28
Block an IP address

Block given ip for X seconds and then automatically unban.
This is sample output - yours may be different.
0

IP=192.168.0.12 DELAY=15 bash -c 'sudo iptables -A INPUT -s ${IP:-badguy.localdomain} -j DROP && echo blocked "$IP" && sudo bash -c "sleep ${DELAY:-600}; iptables -D INPUT -s ${IP:-badguy.localdomain} -j DROP && echo unblocked $IP" 1>&1 & disown %1'

xadi · 2016-04-20 14:28:36 11
Copy to clipboard osx
This is sample output - yours may be different.
0

echo -n "text" | pbcopy

gelldur · 2016-05-09 12:28:44 13
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Get all IPs via ifconfig

and, a lot uglier, with sed: $ ifconfig | sed -n '/inet addr:/s/[^:]\+:$\S\+$.*/\1/p' Edit: Wanted to be shorter than the perl version. Still think that the perl version is the best..

most used commands in history (comprehensive)

Most of the "most used commands" approaches does not consider pipes and other complexities. This approach considers pipes, process substitution by backticks or $() and multiple commands separated by ; Perl regular expression breaks up each line using | or < ( or ; or ` or $( and picks the first word (excluding "do" in case of for loops) note: if you are using lots of perl one-liners, the perl commands will be counted as well in this approach, since semicolon is used as a separator

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

Create a directory and change into it at the same time

How often do you make a directory (or series of directories) and then change into it to do whatever? 99% of the time that is what I do. This BASH function 'md' will make the directory path then immediately change to the new directory. By using the 'mkdir -p' switch, the intermediate directories are created as well if they do not exist.

cpu info

split source code to page with numbers

Resume an emerge, and keep all object files that are already built

For Gentoo: If you do not use this command, portage will fetch the source again, and rebuild the hole application from the top. This command make portage keep all files that ar allready built

Mount iso to /mnt on Solaris

Unmount $ umount /mnt Delete loopback file device $ lofiadm -d /dev/lofi/1

Multi-line grep

Using perl you can search for patterns spanning several lines, a thing that grep can't do. Append the list of files to above command or pipe a file through it, just as with regular grep. If you add the 's' modifier to the regex, the dot '.' also matches line endings, useful if you don't known how many lines you need are between parts of your pattern. Change '*' to '*?' to make it greedy, that is match only as few characters as possible. See also http://www.commandlinefu.com/commands/view/1764/display-a-block-of-text-with-awk to do a similar thing with awk. Edit: The undef has to be put in a begin-block, or a match in the first line would not be found.

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"

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Commands using echo (1,545)

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