Commands using echo sorted by votes

Commands using echo (1,545)

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Get eth0 ip

bash only - no grep, sed, awk, whatever - zero overhead alternatively using ifconfig instead of "ip addr ..." A=$(ifconfig eth0); A=${A##*inet addr:}; echo ${A%% *} Show Sample Output
This is sample output - yours may be different.
```
192.168.242.10
```
0

A=$(ip addr show dev eth0); A=${A##*inet }; echo ${A%%/*}

charley · 2013-03-13 23:07:37 5
macports update
This is sample output - yours may be different.
0

sudo port selfupdate ; echo '---------' ; sudo port upgrade outdated

roozbeh · 2013-03-21 04:07:54 4
Check if variable is a number

calculate if "$1" is a number ... decimals included :)
This is sample output - yours may be different.
0

(($1 > 0)) && echo "var is a number"

khayyam · 2013-03-22 01:15:00 6
Poor man's pomodoro timer

The Pomodoro Technique is a time management method developed by Francesco Cirillo in the late 1980s. The technique uses a timer to break down periods of work into 25-minute intervals called 'Pomodori' (from the Italian word for 'tomatoes') separated by short breaks. You need to prepare a short .wav file (the "ring.wav" in the sample command line). This command will trigger aplay to play ring.wav 25 minutes from now on, which can be used as a poor man's pomodoro timer. Show Sample Output
This is sample output - yours may be different.
```
warning: commands will be executed using /bin/sh
job 16 at Thu Mar 21 23:07:00 2013
```
0

echo "aplay ring.wav" | at now + 25 min

liancheng · 2013-03-22 04:27:57 7
Twitter Account Validator

Reason can be: taken, available, contains_banned_word
This is sample output - yours may be different.
0

if wget https://twitter.com/users/username_available?username=xmuda -q -O - | grep -q "\"reason\":\"taken\""; then echo "Username taken"; else echo "Free / Banned Name"; fi

Joschasa · 2013-03-23 17:39:15 4
find potentially malicious PHP commands used in backdoors and aliked scripts

I have found that base64 encoded webshells and the like contain lots of data but hardly any newlines due to the formatting of their payloads. Checking the "width" will not catch everything, but then again, this is a fuzzy problem that relies on broad generalizations and heuristics that are never going to be perfect. What I have done is set an arbitrary threshold (200 for example) and compare the values that are produced by this script, only displaying those above the threshold. One webshell I tested this on scored 5000+ so I know it works for at least one piece of malware.
This is sample output - yours may be different.
0

for ii in $(find /path/to/docroot -type f -name \*.php); do echo $ii; wc -lc $ii | awk '{ nr=$2/($1 + 1); printf("%d\n",nr); }'; done

faceinthecrowd · 2013-04-05 19:06:17 10
Install phpmyadmin in Debian 6

This command will install phpmyadmin, set apache2 server and restart apache2. After running this command you can open phpmyadmin on http://yoursite.com/phpmyadmin
This is sample output - yours may be different.
0

apt-get install phpmyadmin; echo "Include /etc/phpmyadmin/apache.conf" >> /etc/apache2/apache2.conf; service apache2 restart

ZEROF · 2013-04-06 16:20:55 6
Non-interactively set timezone in Ubuntu

Replace the first part of the command above with the appropriate timezone string. Eg: 'Europe/London' or for UTC - 'Etc/UTC'. The appropriate string can be found from https://en.wikipedia.org/wiki/List_of_tz_database_time_zones This is useful when your server is installed by a data centre (managed hardware, VPS, etc) and the timezone is not usually set to the one your prefer.
This is sample output - yours may be different.
0

echo 'Etc/UTC' | tee /etc/timezone; dpkg-reconfigure --frontend noninteractive tzdata

donatello · 2013-04-22 06:14:55 16
Clear linux cache
This is sample output - yours may be different.
0

sudo su; sync; echo 3 > /proc/sys/vm/drop_caches

ab_simas · 2013-04-23 14:07:15 4
list all process

list all java process info.
This is sample output - yours may be different.
0

for i in `pidof java`; do echo $i; ll /proc/$i; done;

cuizhaohua · 2013-04-26 08:01:21 10
Force a kernel panic

Well, this is quite useful for testing if your hardware watchdog is working properly.
This is sample output - yours may be different.
0

echo c > /proc/sysrq-trigger

fangfufu · 2013-05-07 19:41:40 6
Chrome sucks
This is sample output - yours may be different.
0

ps -o rss= -C Chrome | (x=0; while read rss; do ((x+=$rss)); done; echo $((x/1024)))

sesom42 · 2013-05-08 07:22:03 5
Run git gc in all git repositories bellow .

git gc should be run on all git repositories every 100 commits. This will help do do so if you have many git repositories ;-)
This is sample output - yours may be different.
0

find . -name .git -print0 | while read -d $'\0' g; do echo "$g"; cd "$g"; git gc --aggressive; cd -; done

Tungmar · 2013-05-09 08:03:23 6
Produces a list of when your domains expire
This is sample output - yours may be different.
0

cat domainlist.txt | while read line; do echo -ne $line; whois $line | grep Expiration ; done | sed 's:Expiration Date::'

jun3337 · 2013-05-13 02:55:17 8
grep all pdf files in a folder

This command is useful for searching through a whole folder worth of pdf files. Show Sample Output
This is sample output - yours may be different.
```
--------Lecture_VIII_LinkLayer.pdf-------

forwarding frame before CRC is checked (at end of frame)
--------Lecture_VII_IP.pdf-------

--------Lecture_VI_NetworkLayer.pdf-------
```
0

for i in *.pdf; do echo --------$i-------; echo; pdftotext $i - | grep -i Yourpattern; done

fangfufu · 2013-05-22 05:36:06 12
number kill your terminal

some numbers have strange output! some numbers output nothing! some numbers will kill your terminal! even logout when running in tty but i don't know why! can anyone explain it to me?
This is sample output - yours may be different.
0

for ((i=0; i>-1000; --i)); do echo "${!i}"; done

liungkejin · 2013-05-30 02:52:46 7
Wait for Web service to spin up, aka alert me when the server stops returning a 503

Show Sample Output
This is sample output - yours may be different.
```
OK: server is up.
OK: server is up.
OK: server is up.
```
0

while true; do curl -vsL -o /dev/null example.com 2>&1 | grep 503 > /dev/null || echo "OK: server is up."; sleep 8; done

noah · 2013-06-26 15:24:51 6
Show numerical values for each of the 256 colors in ZSH

Prints an easy-to-copy color code for each color. Show Sample Output
This is sample output - yours may be different.
```
\e[38;05;1m
\e[38;05;2m
\e[38;05;3m
```
0

for i in {0..255}; do echo -e "\e[38;05;${i}m\\\e[38;05;${i}m"; done | column -c 80 -s ' '; echo -e "\e[m"

derv82 · 2013-07-05 07:16:19 6
Encrypt/decrypt a string from the command line

Need to encrypt something from the command line? I've used this before to encrypt passwords with a master password that was shared amongst a team. To decrypt: ~$ echo -n 'jA0EAwMCPdknsznAww5gySL1/quqhXg6QgQkIz5abzGP5EZgTbXCFU+y6dP8ySWovytc' | base64 --decode | gpg --decrypt gpg: CAST5 encrypted data Enter passphrase: secret gpg: encrypted with 1 passphrase HelloWorld! Show Sample Output
This is sample output - yours may be different.
```
Enter passphrase: secret
Repeat passphrase: secret
jA0EAwMCPdknsznAww5gySL1/quqhXg6QgQkIz5abzGP5EZgTbXCFU+y6dP8ySWovytc
```
0

echo 'HelloWorld!' | gpg --symmetric | base64

ryanchapman · 2013-07-06 08:30:35 46
Wait for Web service to spin up, aka alert me when the server stops returning a 503
This is sample output - yours may be different.
0

while curl -dsL example.com 2>&1 | grep 503;do sleep 8;done;echo server up

emile · 2013-07-10 19:03:25 6
kworker issue. Phase 2. Clobbering the interrupt that is problematic

change gpeXX by the culprit you discovered on phase 1 In case of this example, the culprit is the biggest number, ie, gpe1C /sys/firmware/acpi/interrupts/ff_gbl_lock: 0 enabled /sys/firmware/acpi/interrupts/gpe01: 0 enabled /sys/firmware/acpi/interrupts/gpe06: 0 enabled /sys/firmware/acpi/interrupts/gpe17: 2 enabled /sys/firmware/acpi/interrupts/gpe18: 0 enabled /sys/firmware/acpi/interrupts/gpe1C: 19 enabled This procedure,if solved this universal issue all linix distros are experimenting for more than 2 years, may be included at startup, via cron. But try first commandline.
This is sample output - yours may be different.
0

echo "disable" > /sys/firmware/acpi/interrupts/gpeXX

m33600 · 2013-07-16 03:53:20 7
urldecoding

Using PHP shell to URL decode a string. Show Sample Output
This is sample output - yours may be different.
```
q werty=/;
```
0

echo "q+werty%3D%2F%3B" | php -r "echo urldecode(file_get_contents('php://stdin'));"

kartikssj · 2013-07-17 11:37:36 23
Convert Canon CR2 raw pictures to JPG

This command takes all CR2 files in the current directory and convert them into JPG
This is sample output - yours may be different.
0

for i in *.CR2; do dcraw -c -a -h $i | ppmtojpeg > `basename $i CR2`JPG; echo $i done; done

optyler · 2013-07-25 14:58:15 5
convert flac files to mp3 files into subdir mp3

Set variable 'input' to a set of flac files.
This is sample output - yours may be different.
0

IFS=$(echo -en "\n\b"); input="/my/input/dir/*.flac"; mkdir -p $(dirname $f)/mp3; for f in $input; do ffmpeg -i $f -ab 196k -ac 2 -ar 48000 $(dirname $f)/mp3/$(basename "${f:0:${#f}-4}mp3"); done

marminthibaut · 2013-08-02 19:45:38 7
Do Google search from the shell, opening into Chromium or a new Firefox tab if not installed.

Support several arguments. Show Sample Output
This is sample output - yours may be different.
```
$ google 
Usage: google "[seach term]"
$ google test
Created new window in existing browser session.
```
0

google() { gg="https://www.google.com/search?q=";q="";if [[ $1 ]]; then for arg in "$@" ; do q="$q+$arg"; done ; if [[ -f /usr/bin/chromium ]]; then chromium "$gg"$q; else firefox -new-tab "$gg"$q; fi else echo 'Usage: google "[seach term]"'; fi }

LenuX · 2013-08-08 14:34:09 7
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Check if a domain is available and get the answer in just one line

Returns nothing if the domain exists and 'No match for domain.com' otherwise.

ANSI 256 Color Test

Terminal Color tester using python, works with py2 and 3

sed edit-in-place using -a option instead of -i option (no tmp file created)

does the -i option open a tmp file? this method does not.

Read funny developer comments in the Linux source tree

These are way better than fortune(6).

Bash alias for creating screen session containing IRSSI, named irssi, while checking if existing session is created

Bash alias for easy irssi within screen, attempts to attach to existing irssi session, if one exists, otherwise creates one - Including wipe for when system reboots and leaves "dead" session.

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" }

Simultaneously running different Firefox profiles

After running $ firefox -ProfileManager and creating several different profiles, use this command to run multiple Firefox profiles simultaneously.

Show sorted list of files with sizes more than 1MB in the current dir

no fancy grep stuff here.

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)

Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

Compare copies of a file with md5

I had the problem that the Md5 Sum of a file changed after copying it to my external disk. This unhandy command helped me to fix the problem.

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Commands using echo (1,545)

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