Commands using echo sorted by votes

Commands using echo (1,545)

sorted by

See crontabs for all users that have one

This is not exhaustive but after checking /etc/cron* is a good way to see if there are any other jobs any users may have set. Note: this is a repost from a comment "flatcap" made on http://www.commandlinefu.com/commands/view/3726/print-crontab-entries-for-all-the-users-that-actually-have-a-crontab#comment, for which I am grateful and I take no credit.
This is sample output - yours may be different.
0

for USER in /var/spool/cron/*; do echo "--- crontab for $USER ---"; cat "$USER"; done

tyzbit · 2014-12-11 19:48:46 15
Search count how many times a number, character or string is present on a stream

Count how many times a pattern is present into a stream. It can be one or more lines. No overlapping. It means searching for aa on aaa will output 1 not 2.
This is sample output - yours may be different.
0

echo something | awk '{ total += gsub(/yourstring/,"") } END { print total }'

bugmenot · 2014-12-16 20:58:42 8
function to fix files starting with =?UTF-8 and ends with ?=

I still don't know why mutt (or offlineimap or whatever in between), is borking the encoding of my files, but this fixes it. Show Sample Output
This is sample output - yours may be different.
```
It says nothing, it just moves the file with such a name to a utf-8 name.
```
0

fix_saved_files() { for i in "$@" ; do mv $i $(php -r '$or = "'$i'"; mb_internal_encoding("UTF-8"); echo mb_decode_mimeheader($or) . "\n";') ; done; }

guillaume · 2014-12-27 20:37:16 8
Where is left (or right)

Tells you where's left and right. Handy if you can't ever remember them. Show Sample Output
This is sample output - yours may be different.
```
<-left                                                                                                                 right->
```
0

alias left='echo -n "<-left"; for I in $(seq 1 $(($(stty size | cut -d " " -f 2) - 13))); do echo -n " " ; done ; echo -n "right->";'

guillaume · 2014-12-27 20:41:54 9
List ethernet ports speed

It will list your machine's ethernet ports speed Show Sample Output
This is sample output - yours may be different.
```
eth0:   Speed: 1000Mb/s
eth1:   Speed: 1000Mb/s
eth2:   Speed: 10000Mb/s
eth3:   Speed: 10000Mb/s
```
0

for d in $(cd /sys/class/net && echo eth?) ; do echo "$d: $(ethtool $d |grep -w Speed)"; done

bassiek · 2014-12-28 15:47:46 8
set create time using file name for files pulled from android camera
This is sample output - yours may be different.
0

find . -type f -exec echo -n "touch -t \`echo " \; -exec echo -n {} \; -exec echo -n " | sed -E 's/.*([[:digit:]]{8})_([[:digit:]]{4})([[:digit:]]{2}).*/\1\2.\3/g'\` " \; -exec echo {} \; | sh

tippy · 2015-01-08 05:49:34 8
compute the total disk space consumed by a list of files

Given a list of filenames, one per line, in /tmp/filelist, calculate the total sum disk usage.
This is sample output - yours may be different.
0

LISTCOUNT=0; LISTSIZE=0; cat /tmp/filelist | while read FF; do FILESIZE=$(stat -c%s "$FF"); LISTSIZE=$[LISTSIZE+${FILESIZE}]; echo listsize: $LISTSIZE; LISTCOUNT=$[LISTCOUNT+1]; echo listcount: $LISTCOUNT; done | tail -2

mwtzzz · 2015-01-13 00:53:04 8

Save memory and typing when arrow searching through history

Appends 4 configuration lines to your ~/.inputrc which allow you to seach history taking into account the characters you have typed so far. It is taken straight form https://help.ubuntu.com/community/UsingTheTerminal Go there for a complete description (grep for "Incremental history searching"). Not sure about the limits of this (which OS's/terminals), but probably anything unix/linux like will do. Changed my life :) Show Sample Output

echo '\n"\e[A": history-search-backward\n"\e[B": history-search-forward\n"\e[C": forward-char\n"\e[D": backward-char\n' >> ~/.inputrc

temach · 2015-01-15 09:47:49 8

check port open without telnet
This is sample output - yours may be different.
0

nc 127.0.0.1 22 < /dev/null; echo $?

kankan55 · 2015-01-20 04:55:51 9
What's the weather like?

Just 253 chars of pure UNIX magic, with curl. I created this contrived bash one-liner while building a command-line bash game : www.rubegoldbash.com. Show Sample Output
This is sample output - yours may be different.
```
   Endeavour Inlet

   title
   19.128?
   Clouds: 88%
   Humidity: 98%
   Wind: 13.12 m/s
   Pressure: 1013.76hpa
```
0

curl -s ip.appspot.com | xargs -n 1 curl -s "freegeoip.net/csv/$1" | cut -d ',' -f '9 10' | sed 's/,/\&lon=/g' | xargs -n 1 echo "http://api.openweathermap.org/data/2.5/weather?mode=html&lat=$1" | sed 's/ //g' | xargs -n 1 curl -s $1 | lynx -stdin -dump

supermoustachu · 2015-02-04 00:47:06 14
Random Number Between 1 And X

This provides better, but not perfect, distribution, and it works for 2^32 ≤ X ≤ 2^64. (A robust distribution requires iteration/recursion and an indeterminate amount of randomness.)
This is sample output - yours may be different.
0

(od -An -t u8 -N8 </dev/urandom; echo X '* 2 64^/1+p') | dc

imuli · 2015-02-15 19:14:24 8
Copy ssh keys to user@host to enable password-less ssh logins with permissions alignment.

One liner that basically duplicates ssh-copy-id functionality by taking care of most common issues of SSH password-less ssh logins: - missing key on the remote server - braindead permissions *cough* RHEL *cough* Show Sample Output
This is sample output - yours may be different.
```
Host key copied
```
0

cat ~/.ssh/id_rsa.pub | ssh user@hostname 'cat >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys && chmod 700 ~/.ssh && echo "Host key copied"'

rde · 2015-02-17 01:46:03 9

check repos list for fastest ping

This helps me determine which repo I want to use for downloading ISO files Show Sample Output

cat repos.txt | while read line; do echo $line | cut -d"/" -f 3 | fping -e ;done

rawm · 2015-02-17 06:34:07 8

Print a cron formatted time for 2 minutes in the future (for crontab testing)

usage = crontest "/path/to/bin" This version of this function will echo back the entire command so it can be copied/pasted to crontab. Should be able to be automagically appended to crontab with a bit more work. Tested on bash and zsh on linux,freebsd,aix Show Sample Output
This is sample output - yours may be different.
```
49 15 12 03 *   /path/to/bin
```
0

crontest () { date +'%M %k %d %m *' |awk 'BEGIN {ORS="\t"} {print $1+2,$2,$3,$4,$5,$6}'; echo $1;}

CoolHand · 2015-03-12 19:56:56 11
Find the next free user id in OS X

If you want to create new user accounts in OS X from the command line use this fragment to find the next free user id. In OS X CLI you have to assign the user id yourself Show Sample Output
This is sample output - yours may be different.
```
507
```
0

echo $((1+$( dscl . -list /Users UniqueID| awk '{print $2}' | sort -rn | head -1 )))

alecthegeek · 2015-04-04 01:39:46 9
Turn monitor on or off if off or on, respectively

that's how I do it in ubuntu
This is sample output - yours may be different.
0

echo test $DISPLAY > /dev/null || export DISPLAY=:0.0; xset dpms force off;gnome-screensaver-command -l

gargolito · 2015-04-07 19:12:45 9
Removing leading + sign from numbers

The leading plus sign is removed - Minus sign is left intact Show Sample Output
This is sample output - yours may be different.
```
-2
3
```
0

awk '{print $0+0}' <(echo -2; echo +3;)

unixmonkey88472 · 2015-04-08 09:19:24 13
Bruteforce a P12 file

You may use another wordlist generator as regldg or whatever ./regldg '--debug-code=1' '--universe-set=7' '--universe-checking=3' '--max-length=8' '--readable-output' '--num-words-output=100' "(B|b)(n|N)(g|G)(4|a|A)(l|L)"
This is sample output - yours may be different.
0

crunch 7 7 Bbe3EnNGga4AlLa4A | while read line; do keytool -list -storetype PKCS12 -keystore /path/to/file.pfx -storepass $line; if [ $? -eq 0 ]; then echo $line; break; fi; done;

debuti · 2015-04-27 12:06:38 9
Count total amount of image media in current Directory
This is sample output - yours may be different.
0

find -maxdepth 1 -type d | while read dir; do count=$(find "$dir" -regextype posix-extended -iregex '.*\.(jpg|gif|png|jpeg)' | wc -l); echo "$dir ; $count"; done

caliginous · 2015-04-30 05:01:08 8
talking clock

s/espeak/say/ on a mac
This is sample output - yours may be different.
0

echo $(date +%m) past $(date +%H) | espeak

hal8 · 2015-05-09 12:24:13 10
Wait for file to stop changing

perl version of "Wait for file to stop changing" When "FileName" has not been changed for last 10 seconds, then print "DONE" "10" in "(stat)[10]" means ctime. One have other options like atime, mtime and others. http://perldoc.perl.org/functions/stat.html
This is sample output - yours may be different.
0

echo FileName | perl -nlE'sleep 1 while time-(stat)[10]<10' && echo DONE

pung96 · 2015-05-09 14:58:41 9

OneLiner ICMP sniffer in Python

Quick OneLiner to sniff for ICMP traffic, proof of concept socket code. Needs root privs to run. Show Sample Output

echo "exec(\"import socket, os\nwhile True:\n\tprint (socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_ICMP)).recvfrom(65565)\")" | sudo python

justinf · 2015-05-24 08:19:55 13

keep trying a command until it is successful

Keep retrying YOURCOMMAND until it succeeds. Add sleep between retries so that +c works. (Though you can always use +z and kill %1). Source: http://stackoverflow.com/a/5274386/2175968
This is sample output - yours may be different.
0

until YOURCOMMAND; do echo "Retrying"; sleep 2; done

wzhd · 2015-06-03 06:44:24 9
get name of file that is currently playing in mplayer (if there)

grep -v '$/dev/\|pipe:\|socket:$' seemingly looks a bit complicated. This can, of course, be replaced by head -1. However, it is not sure whether the filename line will be first on all systems, so I chose the safer way by filtering out what is not needed here. Show Sample Output
This is sample output - yours may be different.
```
now playing: your fav artist - your fav track.mp3
now playing: your fav movie.mpeg
no track/video playing
```
0

media="$(basename "$(readlink /proc/$(pidof mplayer)/fd/* | grep -v '$/dev/\|pipe:\|socket:$')")" && ((test -n "$media" && echo "now playing: $media") || echo "no track/video playing")

syntaxerror74 · 2015-06-06 13:15:15 9
Generate all possible combinations between aaa 999

tr ' ' '\n' isn't needed, it's just there to make the output prettier. Show Sample Output
This is sample output - yours may be different.
```
...
8Q0
8Q1
8Q2
8Q3
8Q4
8Q5
8Q6
8Q7
8Q8
8Q9
8Ra
8Rb
8Rc
8Rd
8Re
8Rf
8Rg
8Rh
8Ri
8Rj
8Rk
8Rl
8Rm
8Rn
8Ro
8Rp
...
```
0

echo {{a..z},{A..Z},{0..9}}{{a..z},{A..Z},{0..9}}{{a..z},{A..Z},{0..9}} | tr ' ' '\n'

freja · 2015-06-25 15:24:29 9
‹ First < 44 45 46 47 48 > 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

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" }

Reconnect to screen without disconnecting other sessions

Have your screen session running in multiple places. (warning, things start to look weird if the terminal windows have different dimensions)

find and delete empty dirs, start in current working dir

A quick way to find and delete empty dirs, it starts in the current working directory. If you do find . -empty -type d you will see what could be removed, or to a test run.

Find and copy scattered mp3 files into one directory

This command copies all filenames in the current dir and subdirs that end in .mp3 regardless of case (also matches .MP3 .mP3 and .Mp3) It copies all the files to the "mp3" folder in your home directory. If you want to see the files that are beeing copied, replace "cp {}" with "cp -v {}"

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.

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

draw rhomb

Show a Package Version on Debian based distribution

if you don't want to show string "version?, then use awk or cut filter it: apt-cache show pkgname | grep -i "version:" | awk '{ print $2 }' we can also use regex to search many packages and show their versions: apt-cache search pkgregex | grep -i "version:"

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"

list files recursively by size

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