Commands using echo sorted by votes

Commands using echo (1,545)

sorted by

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 28

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 16:43:35 161
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 10:37:19 161
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 11:31:14 258
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 23:44:49 268
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 15:54:24 317
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 07:30:55 306
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 06:11:41 321
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 22:49:21 324
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 07:04:20 450
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 09:20:50 452

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 20:06:05 393

Python version to a file

This command sent the Python version to a file. This is intended to be used in scripts. For some reason, simple redirections didn't work with "python -V" Show Sample Output
This is sample output - yours may be different.
```
cat file
Python 2.6.3
```
0

echo "$(python -V 2>&1)" > file

x3mboy · 2018-11-06 20:52:49 450
‹ First < 48 49 50 51 52 > Last ›

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Check These Out

vim insert current filename

insert filename Normal mode: "%p Insert mode: %

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"

Randomize lines in a file

This appends a random number as a first filed of all lines in SOMEFILE then sorts by the first column and finally cuts of the random numbers.

check open ports without netstat or lsof

Create a tar archive using xz compression

Compress files or a directory to xz format. XZ has superior and faster compression than bzip2 in most cases. XZ is superior to 7zip format because it can save file permissions and other metadata data.

Edit the /etc/sudoers config file the right way.

'visudo' is installed by default on most Unix-like systems. If not installed, you can get it from the 'sudo' package. 'visudo' will use the text editor found in your $EDITOR variable, whether it's vi, vim, emacs, nano or gedit. After making changes to the /etc/sudoers file, visudo will check for syntax errors, and notify you of them. This is better than 'vi /etc/sudoers', because of this capability. Rule #1 of system administration- if there is a tool that exists for editing config files, use the tool.

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

Convert a file from ISO-8859-1 (or whatever) to UTF-8 (or whatever)

I use it sometimes when I work on a french file transferred from a windows XP to a Debian-UTF8 system. Those are not correctly displayed: ? ? ? and so on $man tcs # for all charsets

find an unused unprivileged TCP port

perl-less way

check open ports

Tested in Linux and OSX

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)
» commands using echo

Commands using echo (1,545) the last day the last week the last month all time sorted by date votes

What's this?

Check These Out

Stay in the loop…

Commands using echo (1,545)

sorted by