Commands using echo sorted by votes

Commands using echo (1,545)

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Create a script of the last executed command

This one uses the history modificator :q to automatically quote previous command. It resolves the already in quotes and by using the single quote it prevents resolving variables on execution. Sample output omits the redirection to file to show the problem essence. Show Sample Output
This is sample output - yours may be different.
```
$ echo 'quoted'"output"
quotedoutput
$ echo !!:q
echo 'echo '\''quoted'\''"output"'
echo 'quoted'"output"
```
0

echo !!:q > foo.sh

kudlaty01 · 2017-10-06 08:49:27 21
Encode string with NOTs
This is sample output - yours may be different.
0

echo -e 'import ctypes\nimport sys\nf="/etc/passwd"\nfor i in f:\n\tsys.stdout.write(hex(ctypes.c_uint8(~ord(i)).value)+",")\nsys.stdout.write("\\n")' | python

sinkmanu · 2017-10-12 11:19:05 19
Add Rudimentary Logging Levels According to STDOUT/STDERR

This is a bit of a bash hack to catch STDERR and append a log level to it. So for example, if your script has pseudo loglevels like so: echo "INFO - finding files" [ -f ${files} ] || echo "WARN - no files found" Any subcommands that write to STDERR will screw that up Adding 2> >(fb=$(dd bs=1 count=1 2>/dev/null | od -t o1 -A n); [ "$fb" ] && err=$(printf "\\${fb# }"; cat) && echo "ERROR - $err") to the command does the following: 2> Redirect STDERR >( Spawn a subshell (STDERR is then redirected to the file descriptor for this subshell) fb=$(....) get the first byte of input [ "$fb" ] test if there's a first byte && err=$(printf....) save the output to the $err variable && echo "ERROR - $err" append your pseudo loglevel and the error message Heavily borrowed from https://unix.stackexchange.com/questions/33049/check-if-pipe-is-empty-and-run-a-command-on-the-data-if-it-isnt Show Sample Output
This is sample output - yours may be different.
```
INFO - finding files
ERROR - find: ?/folder/does/not/exist?: No such file or directory
```
0

[command] 2> >(fb=$(dd bs=1 count=1 2>/dev/null | od -t o1 -A n); [ "$fb" ] && err=$(printf "\\${fb# }"; cat) && echo "ERROR - $err")

tyzbit · 2017-10-16 22:22:42 21
Show a clock in the upper right corner

This will use tput to place the command (date %T in this case) in the upper right corner of the terminal
This is sample output - yours may be different.
0

while sleep 1;do tput sc;tput cup 0 $(($(tput cols)-11));echo -e "\e[31m`date +%T`\e[39m";tput rc;done &

x3mboy · 2017-11-16 18:07:39 19
Find & remove files that are duplicates but with different extensions recursively

Very useful to get rid of backup files or wrong extension files that lure in your folders In this example first I do two searches for all filenames of the two extensions .jpg and .png, then delete the extension and only output the now duplicate files. I loop with these results and print a log and delete the file with the extension I dislike. Show Sample Output
This is sample output - yours may be different.
```
deleted: contrib/image/4legs/cat.png
deleted: contrib/image/4legs/dog.png
deleted: contrib/image/withwings/fly.png
```
0

for f in `comm -1 -2 <(sort <(find contrib/image/ -name *.png | sed 's/\.[^.]*$//')) <(sort <(find contrib/image/ -name *.jpg | sed 's/\.[^.]*$//'))`;do rm "$f.png" && echo "deleted: $f.png";done

TheoNaciri · 2017-11-28 15:48:15 24
Random IPv4 address

the part after sed is optional. if you want, omit the last dot(.) yourself.
This is sample output - yours may be different.
0

for i in a b c d; do echo -n $(($RANDOM % 256)).; done | sed -e 's/\.$//g'

farooqkz · 2017-12-04 14:12:19 21
Count number of javascript files in subdirectories

I wanted to count and display the top directories containing JavaScript files in some of my project. Here it is. Maybe it can be written to more simply syntax by using find -exec...
This is sample output - yours may be different.
0

for f in `find . -type d`; do pushd . > /dev/null ; echo -e `cd $f ; find . -name \*\.js | wc -l` "\t" $f | grep -v ^0 ; popd >/dev/null; done | sort -n -k 1 -r | less

tobi · 2017-12-19 09:08:04 21
2 SSL get expiration date from remote site
This is sample output - yours may be different.
0

echo | openssl s_client -servername google.de -connect google.de:443 2>/dev/null | openssl x509 -noout -enddate

aysadk · 2017-12-22 11:09:17 20
Show public IPv4 and IPv6
This is sample output - yours may be different.
0

echo "IPv4: $(curl -s4 ip.appspot.com)" ; echo "IPv6: $(curl -s6 ip.appspot.com)"

pqatsi · 2017-12-26 12:52:38 19
repeat any string or char n times without spaces between

Use yes to repeat (it will continue until the pipe breaks) https://en.wikipedia.org/wiki/Yes_(Unix) head -n5 to repeat the piped command n times. https://en.wikipedia.org/wiki/Head_(Unix) Show Sample Output
This is sample output - yours may be different.
```
+++++
```
0

echo "$(yes '+' | head -n5)"

Artistan · 2017-12-31 19:12:23 21
repeat any string or char n times without spaces between

Using zsh parameter expansion Show Sample Output
This is sample output - yours may be different.
```
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
```
0

echo ${(l:80::+:)}

rjf89 · 2018-01-04 18:34:16 20
check open network port with cat

Trying to check for an open port and missing netcat or nmap? This is the lowest common denominator way to verify a port is accessible from one server to another. This will give you a pretty quick return of 0 if it works. If it fails, it will just hang and takes awhile to timeout. I usually ctrl+c the command. "echo ?$" will give you an exit code other then 0 after you exit. Show Sample Output
This is sample output - yours may be different.
```
cat < /dev/null > /dev/tcp/www.msn.com/89; echo $?
cat < /dev/null > /dev/tcp/8.8.8.8/53; echo $?
```
0

cat < /dev/null > /dev/tcp/<hostname or ip>/<port>; echo $?

pborowicz · 2018-02-14 15:51:51 36
In URL converts %XX to chars

Waits URL, then converts. Show Sample Output
This is sample output - yours may be different.
```
> https://ru.wikipedia.org/wiki/%D0%9A%D1%81%D0%B5%D0%BD%D0%B8%D1%8F
> https://ru.wikipedia.org/wiki/&#1050;&#1089;&#1077;&#1085;&#1080;&#1103;
```
0

read -p "> " URL; echo -e "> `echo $URL | sed 's|%|\\\\x|g'`"

bravikov · 2018-03-05 05:15:48 26

A line across the entire width of the terminal

Here is an alternative that support unicodes, using echo: It is using the \c flag, meaning no new line for the echo option -e. You can replace the = with any unicode character. Or to do the same into a PHP bash script: shell = system("tput cols"); for( $i= 0 ; $i < $shell ; $i++ ){ echo "█"; } Show Sample Output

for ((i=0; i<$(tput cols); i++)); do echo -e "=\c" ;done

K33st · 2018-03-19 19:37:02 27

Check the total memory usage of processes with a specific name

Get the total RESIDENT memory used by processes of a specific name. This means this is the MINIMUM used by a process, but some memory could be paged out to swap. Show Sample Output
This is sample output - yours may be different.
```
$ pids=$(pidof chrome); for p in ${pids[@]}; do cat /proc/$p/status | grep -i vmrss | awk '{print $2}'; done | while read m; do let t=$t+$m; echo $t; done | echo "$(tail -n 1) kB"
12613760 kB
```
0

pids=$(pidof chrome); for p in ${pids[@]}; do cat /proc/$p/status | grep -i vmrss | awk '{print $2}'; done | while read m; do let t=$t+$m; echo $t; done | echo "$(tail -n 1) kB"

tyzbit · 2018-04-08 16:43:35 154
simple pomodoro
This is sample output - yours may be different.
0

while true; do sleep $((40 * 60)); echo "Fuck away for some time"; sleep $((3 * 60)); done &

dav23r · 2018-04-23 10:37:19 154
Count all [space][new line][space][new line] pattern using grep

Using to count all sentences in CoNLL data format
This is sample output - yours may be different.
0

echo $(( $(grep -c '^ $' file_name) / 2 ))

hiepdev · 2018-06-28 11:31:14 251
Add some text and the current date and time to a file

Show Sample Output
This is sample output - yours may be different.
```
This will output (without the quotes) "some text 2018-07-27_00:30:33" to /path/to/filename
```
0

echo "some text `date +%Y-%m-%d\_%H:%M:%S`" >> /path/to/filename

test666v2 · 2018-07-26 23:44:49 262
Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)

Removed grep and simplified if statement. -- Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale. Show Sample Output
This is sample output - yours may be different.
```
2018-04-13 Friday the 13th
2018-07-13 Friday the 13th
2019-09-13 Friday the 13th
2019-12-13 Friday the 13th
2020-03-13 Friday the 13th
2020-11-13 Friday the 13th
2021-08-13 Friday the 13th
2022-05-13 Friday the 13th
2023-01-13 Friday the 13th
2023-10-13 Friday the 13th
2024-09-13 Friday the 13th
2024-12-13 Friday the 13th
2025-06-13 Friday the 13th
```
0

for i in {2018..2025}-{01..12}-13; do [[ $(date --date $i "+%u") == 5 ]] && echo "$i Friday the 13th"; done

cpqlinux · 2018-07-30 15:54:24 306
Add a repo to pacman
This is sample output - yours may be different.
0

echo -e "\n[sublime-text]\nServer = https://download.sublimetext.com/arch/dev/x86_64" | sudo tee -a /etc/pacman.conf

HaoZeke · 2018-08-13 07:30:55 300
Export all Stremio movie names

I couldn't find movie library on any of the SQLlite Stremio databases, but on ~/.config/stremio/backgrounds2 the background image filenames corresponds to IMDB URL. So I foreach files and wget HTML title of each movie and save it to a file. This will retrieve all movie names, not just the Library.
This is sample output - yours may be different.
0

time for movie in $(ls -1 $HOME/.config/stremio/backgrounds2 | sort -u);do echo "https://www.imdb.com/title/$movie/" | wget -qO- -O- -i- --header="Accept-Language: en" | hxclean | hxselect -s '\n' -c 'title' 2>/dev/null | tee -a ~/movie-list.txt ; done

pabloab · 2018-08-16 06:11:41 314
Pluralize user input

Pluralize a word, aka change from single to multiple; text formatting. echo hamburgler | pluralize Show Sample Output
This is sample output - yours may be different.
```
hamburglers
```
0

pluralize() { if [ -n "$1" ]; then echo ${1}s else while read line; do pluralize $line done fi }

cryptology_codes · 2018-08-21 22:49:21 317
Disable Gradle daemon

Disabling Gradle daemon can sometimes improve build reliability.
This is sample output - yours may be different.
0

echo "org.gradle.daemon=false" >> ~/.gradle/gradle.properties

pkozelka · 2018-10-25 07:04:20 441
Count lines of the founded files
This is sample output - yours may be different.
0

echo "$(find ./ -name '*' -type f -exec wc -l {} \; | awk '{print $1}' | tr '\n' '+' | sed s/+$//g)" | bc -l

jnana0812 · 2018-10-26 09:20:50 445

sched && syscall app state awareness basics

example or test, basic awareness on app state, mostly for copy-paste reasons, requires auditd (ausyscall), rekt echoing (everything here is rekt) Show Sample Output

pgrep -f bash | while read PMATCH;do echo "$PMATCH # $(grep -e nr_involuntary_switches /proc/$PMATCH/sched|tr -d '\040\011\012\015') # [sysc]:$(ausyscall $(cat /proc/$PMATCH/syscall|cut -d' ' -f1))"; done;

x0a · 2018-10-29 20:06:05 387

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Monitor dynamic changes in the dmesg log.

Other logs can be monitored similarly, e.g. $ watch "tail -15 /var/log/daemon.log"

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"

Remove empty directories

You can also use, $ find . -depth -type d -exec rmdir {} \; 2>/dev/null

translate what is in the clipboard in english and write it to the terminal

Uses google api to translate, you can modify the language in which translate modifying the parameter "langpair=|en", the format is language input|language output.

Text graphing ping output filter

Nasty perl one-liner that provides a sparkline of ping times. If you want a different history than the last 30, just put that value in. It (ab)uses unicode to draw the bars, inspired by https://github.com/joemiller/spark-ping . It's not the most bug-free piece of code, but what it lacks in robustness it makes up for in capability. :) If anyone has any ideas on how to make it more compact or better, I'd love to hear them. I included a ping to google in the command just as an example (and burned up 10 chars doing it!). You should use it with: $ ping example.com | $SPARKLINE_PING_COMMAND

fdiff is a 'filtered diff'. Given a text filter and two inputs, will run the filter across the input files and diff the output.

Fdiff will run the command given by the first argument against the input files given as the second and third arguments, and diff the results. It will use 'diff' as the default diff program, but this can be changed by setting $DIFFCMD, e.g. $ export DIFFCMD=vimdiff; $ fdiff zcat 0716_0020005.raw.gz 0716_0030005.raw.gz ... This function will work under bash, but requires the use of command substitution, which is not available under a strict ANSI shell.

Rsync using SSH and outputing results to a text file

--delete will delete copies on remote to match local if deleted on local --stats will output the results -z zip -a archive -A preserve ACL -x don't cross filesystem boundaries -h human readable -e specify the remote shell to use

Immediately put execute permission on any file saved/created in $HOME/bin

Change timestamp on a file

-a for access time, -m for modification time, -c do not create any files, -t timestamp

find files containing text

-l outputs only the file names -i ignores the case -r descends into subdirectories

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Commands using echo (1,545)

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