Commands using echo sorted by votes

Commands using echo (1,545)

sorted by

write the output of a command to /var/log/user.log... each line will contain $USER, making this easy to grep for.

This command is useful if you want to copy the output of a series of commands to a file, for example if you want to pastebin the output from 'uname -a', 'lspci -vvv' and 'lsmod' for video driver trouble-shooting on your favorite Linux forum. 'log' takes all the following arguments as a command to execute, with STDOUT sent to /var/log/user.log. The command is echoed to the log before it is executed. The advantages of using logger (as opposed to appending output from commands to a file) are 1) commands are always appended to the logs... you don't have to worry about clobbering your log file accidentally by using '>' rather than '>>' 2) logs are automatically cleaned up by logrotate. The following functions allow you to mark the start and end of a section of /var/log/user.log. startlog() { export LOGMARK=$(date +%Y.%m.%d_%H:%M:%S); echo "$LOGMARK.START" | logger -t $USER; } then endlog() { echo "$LOGMARK.END" | logger -t $USER; } printlog will print all lines between $LOGMARK.START and $LOGMARK.END, removing everything that is prepended to each line by logger. printlog() { sudo sed -n -e "/$LOGMARK.START/,/$LOGMARK.END/p" /var/log/user.log| sed "s/.*$USER: //"; } The following command should dump just about all the information that you could possibly want about your linux configuration into the clipboard. startlog; for cmd in 'uname -a' 'cat /etc/issue' 'dmesg' 'lsusb' 'lspci' 'sudo lshw' 'lsmod'; do log $cmd; done; endlog; printlog | xsel --clipboard This is ready for a trip to http://pastebin.com/, and you don't have to worry about leaving temporary files lying around cluttering up $HOME. Caveats: I'm sure that startlog, endlog, and printlog could use some cleanup and error checking... there are unchecked dependencies between printlog and endlog, as well as between endlog and startlog. It might be useful for 'log' to send stderr to logger as well. Show Sample Output
This is sample output - yours may be different.
```
$ log uname -a; sudo tail -2 /var/log/user.log
Sep 25 16:12:44 tiger-laptop tiger: $ uname -a
Sep 25 16:12:44 tiger-laptop tiger: Linux tiger-laptop 2.6.31-22-generic-pae #65-Ubuntu SMP Thu Sep 16 16:02:41 UTC 2010 i686 GNU/Linux
```
5

log() { (echo "\$ $@";$@) | logger -t $USER; }

bartonski · 2010-09-25 20:43:22 5
Show exit status of all portions of a piped command eg. ls |this_doesn't_exist |wc
This is sample output - yours may be different.
5

echo ${PIPESTATUS[@]}

nottings · 2010-11-01 21:46:58 3
duration of the DNS-query
This is sample output - yours may be different.
5

server=8.8.8.8; host="apple.com"; queries=128; for i in `seq $queries`; do let x+=`dig @${server} $host | grep "Query time" | cut -f 4 -d " "`; done && echo "scale=3;($x/${queries})" | bc

cas_alexi · 2010-11-25 09:52:38 4
do 'foo' until it exits successfully, pausing in between crashes

restart a buggy script when it dies. works great for "git svn fetch", which leaks memory like a sieve and eventually dies...making you restart it.
This is sample output - yours may be different.
5

until foo some args; do echo "crashed: $? respawning..." >&2; sleep 10; done

braddunbar · 2010-11-28 18:08:58 4
Email yourself after a job is done

This is a two part command that comes in really handy if you're running commands that take longer than you're willing to wait. The commands are separated by the semicolon(;) The first command is whatever you're attempting to do. The second commands emails you after the job completes. Show Sample Output
This is sample output - yours may be different.
```
mysqldump -A; echo "job done"|mail 5551231234@vzwpix.com -s'job done'
sends a txt message to your phone tell you the job is done.
```
5

<command>; echo "job done"|mail email@email.com -s'job done'

windfold · 2011-05-05 18:13:17 12
draw matrix using dot
This is sample output - yours may be different.
5

echo 'graph{node[shape=record];rankdir=LR;matrix[label="{1|2|3}|{4|5|6}|{7|8|9}",color=red]}' | dot -Tpng | display

kev · 2011-12-28 04:50:09 8
Remove all leading and trailing spaces or tabs from all lines of a text file

Bash only, no sed, no awk. Multiple spaces/tabs if exists INSIDE the line will be preserved. Empty lines stay intact, except they will be cleaned from spaces and tabs if any available.
This is sample output - yours may be different.
5

while read l; do echo -e "$l"; done <1.txt >2.txt

knoppix5 · 2012-03-13 14:27:49 6

Search for packages, ranked by popularity

This will take the packages matching a given `apt-cache search` query (a collection of AND'd words or regexps) and tell you how popular they are. This is particularly nice for those times you have to figure out which solution to use for e.g. a PDF reader or a VNC client. Substitute "ubuntu.com" for "debian.org" if you want this to use Ubuntu's data instead. Everything else will work perfectly. Show Sample Output

apt-popcon() { (echo \#rank; apt-cache search "$@" |awk '$1 !~ /^lib/ {print " "$1" "}') |grep -Ff- <(wget -qqO- http://popcon.debian.org/by_inst.gz |gunzip); }

adamhotep · 2012-09-08 00:29:31 4

Output as many input

Output of a command as input to many Show Sample Output
This is sample output - yours may be different.
```
totti@totti-lap:~/tmp$ echo 'foo' | tee >(wc -c) >(grep o) >(grep f)
foo
foo
foo
4
```
5

echo 'foo' | tee >(wc -c) >(grep o) >(grep f)

totti · 2013-01-31 09:54:18 22
Encrypt and password-protect execution of any bash script

(Please see sample output for usage) script.bash is your script, which will be crypted to script.secure script.bash --> script.secure You can execute script.secure only if you know the password. If you die, your script dies with you. If you modify the startup line, be careful with the offset calculation of the crypted block (the XX string). Not difficult to make script editable (an offset-dd piped to a gpg -d piped to a vim - piped to a gpg -c directed to script.new ), but not enough space to do it on a one liner. Show Sample Output
This is sample output - yours may be different.
```
$ cat script.bash 

#!/bin/bash
echo "Hello, world"

$ echo "eval \"\$(dd if=\$0 bs=1 skip=XX 2>/dev/null|gpg -d 2>/dev/null)\"; exit" > script.secure; sed -i s:XX:$(stat -c%s script.secure): script.secure; gpg -c < script.bash >> script.secure; chmod +x script.secure
Enter passphrase:
Repeat passphrase:

$ ./script.secure 
Enter passphrase:

Hello, world

$ cat script.secure 
eval "$(dd if=$0 bs=1 skip=69 2>/dev/null|gpg -d 2>/dev/null)"; exit
%6&A2%&F%&B%&%4&%
```
5

echo "eval \"\$(dd if=\$0 bs=1 skip=XX 2>/dev/null|gpg -d 2>/dev/null)\"; exit" > script.secure; sed -i s:XX:$(stat -c%s script.secure): script.secure; gpg -c < script.bash >> script.secure; chmod +x script.secure

rodolfoap · 2013-03-09 11:16:48 20
Graphically show percent of mount space used

Automatically drops mount points that have non-numeric sizes (e.g. /proc). Tested in bash on Linux and AIX. Show Sample Output
This is sample output - yours may be different.
```
/                        ============= 13
/var                     ================== 18
/home                    ============================================ 44
/tmp                     == 2
/boot                    ====== 6
/dev/shm                  0
```
5

for m in `df -P | awk -F ' ' '{print $NF}' | sed -e "1d"`;do n=`df -P | grep "$m$" | awk -F ' ' '{print $5}' | cut -d% -f1`;i=0;if [[ $n =~ ^-?[0-9]+$ ]];then printf '%-25s' $m;while [ $i -lt $n ];do echo -n '=';let "i=$i+1";done;echo " $n";fi;done

drockney · 2013-07-29 20:12:39 6
Found how how much memory in kB $PID is occupying in Linux

The "proportional set size" is probably the closest representation of how much active memory a process is using in the Linux virtual memory stack. This number should also closely represent the %mem found in ps(1), htop(1), and other utilities. Show Sample Output
This is sample output - yours may be different.
```
92327
```
5

echo 0$(awk '/Pss/ {printf "+"$2}' /proc/$PID/smaps)|bc

atoponce · 2013-09-26 18:20:22 10
Prepend text to a file
This is sample output - yours may be different.
5

echo "text to prepend" | cat - file

zluyuer · 2015-07-13 02:32:12 19
Check the current price of Bitcoin in USD

Show Sample Output
This is sample output - yours may be different.
```
1 BTC = 232.7678 USD
```
5

echo "1 BTC = $(curl -s https://api.coindesk.com/v1/bpi/currentprice/usd.json | grep -o 'rate":"[^"]*' | cut -d\" -f3) USD"

cadejscroggins · 2015-09-19 00:17:02 52
Chronometer in hour format

Shorter and faster... Show Sample Output
This is sample output - yours may be different.
```
00:00:35.743165049
00:00:37.774117989
```
5

stf=$(date +%s.%N);for ((;;));do ctf=$( date +%s.%N );echo -en "\r$(date -u -d "0 $ctf sec - $stf sec" "+%H:%M:%S.%N")";done

glaudiston · 2017-01-26 14:31:33 28

Calculate days on which Friday the 13th occurs

I removed the dependency of the English language Show Sample Output

for y in $(seq 1996 2018); do echo -n "$y -> "; for m in $(seq 1 12); do NDATE=$(date --date "$y-$m-13" +%w); if [ $NDATE -eq 5 ]; then PRINTME=$(date --date "$y-$m-13" +%B);echo -n "$PRINTME "; fi; done; echo; done

ginochen · 2018-06-25 09:20:57 254

Check if your desired password is already available in haveibeenpwnd database. This command uses the API provided by HIBP
This is sample output - yours may be different.
5

function hibp() { sha1=$(echo -n "$1"|sha1sum|awk '{print toupper($0)}'|tr -d '\n'); curl -s -H $'Referer: https://haveibeenpwned.com/' https://api.pwnedpasswords.com/range/$(echo -n $sha1|cut -c1-5)|grep -i $(echo -n $sha1|cut -c6-40); }

zmonkey · 2018-08-14 07:41:55 313
Instead of saying RTFM!
This is sample output - yours may be different.
5

echo "[q]sa[ln0=aln256%Pln256/snlbx]sb729901041524823122snlbxq"|dc

wuseman1 · 2019-03-02 10:00:53 57
shell bash iterate number range with for loop

Bash's arithmetic evaluation.
This is sample output - yours may be different.
5

for((i=1;i<=10;i++)){ echo $i; }

metropolis · 2019-07-28 02:32:09 80
List all files in a folder in a git repository by last commit date

This lists all the files in a folder, then finds the commit date for them one by one, then sorts them from newest to oldest
This is sample output - yours may be different.
5

git ls-tree --name-only HEAD foldername/ | while read filename; do echo "$(git log -1 --format="%ci " -- $filename) $filename"; done | sort -r

fivestones · 2023-03-01 17:02:51 273
Check if a domain is available for purchase

A quick alias to check if a domain is already registered or if it's available for purchase. Show Sample Output
This is sample output - yours may be different.
```
$ canibuy commandlinefu.com
taken
$ canibuy commandlinekungfu.com
available
```
5

function canibuy { whois "$1" 2>/dev/null | grep -q 'Registrant' && echo "taken" || echo "available" }

tyzbit · 2023-06-21 15:01:25 181
a for loop with filling 0 format, with seq

seq allows you to format the output thanks to the -f option. This is very useful if you want to rename your files to the same format in order to be able to easily sort for example: for i in `seq 1 3 10`; do touch foo$i ;done And ls foo* | sort -n foo1 foo10 foo4 foo7 But: for i in `seq -f %02g 1 3 10`; do touch foo$i ;done So ls foo* | sort -n foo01 foo04 foo07 foo10 Show Sample Output
This is sample output - yours may be different.
```
$>for i in `seq -f %03g 5 50 111`; do echo $i ; done
005
055
105
```
4

for i in `seq -f %03g 5 50 111`; do echo $i ; done

lhb · 2009-02-17 08:41:44 6
Count down from 10

Countdown from 10 or whatever you want:) Show Sample Output
This is sample output - yours may be different.
```
10
9
8
7
6
5
4
3
2
1
```
4

for (( i = 10; i > 0; i-- )); do echo "$i"; sleep 1; done

mestr · 2009-02-18 20:31:46 7
HTTP redirect

any HTTP requests to the machine on the specified port will be redirected to http://www.whatevs.com... quick, dirty, works fine for sites w/
This is sample output - yours may be different.
4

while [ 0 ]; do echo -e "HTTP/1.1 302 Found\nLocation: http://www.whatevs.com/index.html" | nc -vvvv -l -p 80; done

wwest4 · 2009-02-19 18:04:01 9
checking space availabe on all /proc/mounts points (using Nagios check_disk)

More info here: http://nagioswiki.com/wiki/index.php/Checking_/proc/mounts_on_remote_server Show Sample Output
This is sample output - yours may be different.
```
root@nagios plugins]# pwd

/usr/lib/nagios/plugins

[root@nagios plugins]# ./check_nrpe -H monitored-server -c check_disks_proc_mounts

DISK OK - free space: / 5811 MB (59%); /boot 35 MB (57%); /opt 3401 MB (34%); /dev/shm 1948 MB (100%); /tmp 6731 MB (94%); /var 4222 MB (84%);| /=4033MB;8367;8859;0;9844 /boot=26MB;51;54;0;60 /opt=6676MB;8564;9068;0;10076 /dev/shm=0MB;1655;1753;0;1948 /tmp=395MB;6057;6413;0;7126 /var=820MB;4284;4536;0;5041
```
4

check_disk -w 15% -c 10% $(for x in $(cat /proc/mounts |awk '{print $2}')\; do echo -n " -p $x "\; done)

scubacuda · 2009-02-19 22:54:06 7
‹ First < 7 8 9 10 11 > 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

Find the package that installed a command

output your microphone to a remote computer's speaker

Detect illegal access to kernel space, potentially useful for Meltdown detection

Based on capsule8 agent examples, not rigorously tested

Convert embedded spaces in filenames to "_" (underscore)

This command converts filenames with embedded spaces in the current directory replacing spaces with the underscore ("_") character.

ISO info

Get details about an ISO image , without burning it or mounting it .

count of down available ips

avoid wc overload ;)

Print one . instead of each line

If you're running a command with a lot of output, this serves as a simple progress indicator. This avoids the need to use `/dev/null` for silencing. It works for any command that outputs lines, updates live (`fflush` avoids buffering), and is simple to understand.

Rename files in batch

Rename files with vim.

Opens a list of files in a text editor. Using Vim as your default editor allows you to use the power of regex substitution and visual block mode to batch rename files. Found in the renameutils package sudo apt-get install renameutils

Renames all files in the current directory such that the new file contains no space characters.

This is a better version, as it does no command piping, uses for instead of while loops, which allows for a list of files in the current working directory to be natively processed. It also uses the -v/verbose option with mv to let you know what the command is doing. While the command does exactly the same in a better way, I would modify the sed option to replace spaces with underscores instead, or dashes. Please note that you'll receive errors with this command as it tries to rename files that don't even have spaces. This is an alternative to: http://www.commandlinefu.com/commands/view/8761/renames-all-files-in-the-current-directory-such-that-the-new-file-contains-no-space-characters.

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