Commands using echo sorted by votes

Commands using echo (1,545)

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Calculate comment density of shell scripts in a directory

Show Sample Output
This is sample output - yours may be different.
```
7882 lines = 7576 sloc [96%] + 306 comments [3%]
```
0

dir=/rom; a=$(find $dir -name \*.sh -exec cat '{}' \; | egrep -cv '^[[:space:]]*#'); b=$(find $dir -name \*.sh -exec cat '{}' \; | egrep -c '^[[:space:]]*#'); echo $((a+b)) lines = ${a} sloc [$((a*100/(a+b)))%] + ${b} comments [$((b*100/(a+b)))%]

koniu · 2016-05-19 08:35:56 86
Convert any text you type into sha1

Convert any text you type into sha1 Show Sample Output
This is sample output - yours may be different.
```
$echo -n "sua mensagem" | openssl sha1
0f1ef1d7a1dd0df4c4a9cd3dfb288e8e802980a8
$
```
0

echo -n "sua mensagem" | openssl sha1

gustavohmsilva · 2016-07-22 15:12:40 10
Depend behaviour on hour (e.g. "*" between 10 and 22 , and "#" between 23 to 9 )

echo 'Current hour' hour=$(date +%H) if [ $hour -gt 9 -a $hour -lt 23 ]; then echo -n '*'; else echo -n '#'; fi; echo ' '$hour; echo 'Test around the clock:' for hour in {0..23} {0..23}; do if [ $hour -gt 9 -a $hour -lt 23 ]; then echo -n '*'; else echo -n '#'; fi; echo ' '$hour; done echo 'If you need to depend on UTC, just add `-u` flag to `date` command' Show Sample Output
This is sample output - yours may be different.
```
* 22
```
0

hour=$(date +%H); if [ $hour -gt 9 -a $hour -lt 23 ]; then echo -n '*'; else echo -n '#'; fi; echo ' '$hour;

gwpl · 2016-07-26 20:53:59 11
One-liner to draw a spinning cursor pinwheel in a terminal
This is sample output - yours may be different.
0

for item in \\ \| / - \\ \| / - \\ \| / - \\ \| / - \\ \| / - \\ \| / -; do echo -ne "$item \r"; sleep .2; done; echo

iammyownalterego · 2016-08-03 13:10:03 12
Disk usage summary

Adds up the used disk space on all hard drives that are directly connected to the machine (i.e. no network mounts etc.) Assumes there are no IDE drives present. Show Sample Output
This is sample output - yours may be different.
```
18 GiB used in total
```
0

echo $(df -BG | grep sd | awk '{print $3}' | paste -sd+ | tr -d G | bc) GiB used in total

thureduehrsen · 2016-08-09 10:08:35 38
check open ports without netstat or lsof

Order and uniq
This is sample output - yours may be different.
0

declare -a array=($(tail -n +2 /proc/net/tcp | cut -d":" -f"3"|cut -d" " -f"1")) && for port in ${array[@]}; do echo $((0x$port)); done | sort | uniq

lucasjr76 · 2016-08-19 03:20:59 18
Join lines and separate with spaces
This is sample output - yours may be different.
0

echo `cat file.txt`

unixmonkey94613 · 2017-01-06 11:48:53 15
Chronometer

A way for tracking times in bash Show Sample Output
This is sample output - yours may be different.
```
1.963692732
5.074129173
7.986306243
10.075936725
10.673989319^C
```
0

stf=$(date +%s.%N);st=${stf/.*/};sn=%{stf/*./};for ((;;));do ctf=$( date +%s.%N );ct=${ctf/.*/};cn=${ctf/*./}; echo -en "\r$(echo "scale=3; $ctf-$stf" | bc)";done

glaudiston · 2017-01-26 13:20:30 18
Chronometer in hour format

Just add a format to chronometer in bash Show Sample Output
This is sample output - yours may be different.
```
00:00:58.949167828
00:01:03.670523001
```
0

stf=$(date +%s.%N);st=${stf/.*/};sn=%{stf/*./};for ((;;));do ctf=$( date +%s.%N );ct=${ctf/.*/};cn=${ctf/*./}; dtf=$(echo "scale=3; $ctf-$stf" | bc); dt=${dtf/.*/}; dt=${dt:=0};echo -en "\r$(date -u -d @$dt "+%H:%M:%S.${dtf/*./}")";done

glaudiston · 2017-01-26 13:42:53 18
search and cut between two strings

to find and cut between to strings with grep and cut Show Sample Output
This is sample output - yours may be different.
```
link to open
```
0

echo '<div class="Btn">link to open </div>' | grep -oP '(?<="Btn").*?(?= </div>)' | cut -d ">" -f2

aysadk · 2017-02-16 21:21:50 17

add time to make output and redirect it to a file

Will prepend date and time in the following format: dd-mm-yyyy@hh:mm:ss (24hours format) and redirect it to make.out file Show Sample Output

make -j 2>&1 | while IFS= read -r line; do echo "$(date +"%d-%m-%Y@%T") $line"; done > make.out

redowk · 2017-03-06 18:14:51 21

Toggle the Touchpad on or off
This is sample output - yours may be different.
0

synclient TouchpadOff=$(synclient -l | grep -q 'TouchpadOff.*1'; echo $?)

Cas00 · 2017-03-11 12:11:01 20
Calculate xor in bash

This command calculates the XOR from two given HEX numbers ($1 and $2) Show Sample Output
This is sample output - yours may be different.
```
0-F
```
0

echo $(( 0x$1 ^ 0x$2 ))

imjoseangel · 2017-04-09 11:34:46 60
Disable man-db cron and apt trigger
This is sample output - yours may be different.
0

echo 'man-db man-db/auto-update boolean false' |sudo debconf-set-selections

ara4sh · 2017-04-15 11:02:11 19
Test internet connection
This is sample output - yours may be different.
0

if nc -zw1 google.com 443 2>/dev/null; then echo 'Connected!'; fi

keith · 2017-04-19 12:18:43 32
Do mathematical operation on every line of a given file for the first value found to be replaced (other lines stay untouched)

The given file may contain any kind of characters. This is compatible for most simple mathematical operation. For the first number found, it will be replaced by the result of a factor operation of 1000. To change the filename or multiplactor or number regular expression, change the first fixed values. Show Sample Output
This is sample output - yours may be different.
```
For a given filename such as test.csv, a new filename new_test.csv will be created containing the new values after the math operation.
command source: cat test.csv
command output: cat new_test.csv
```
0

n=1000;f="test.csv";r='([0-9]+.{0,1}[0-9]*)';echo -n "" > new_${f};cat $f | while read l;do val=`echo $l | egrep -o $r` ; if [ ! -z $val ];then newval=`echo $val \* $n | bc -l`;l=`echo $l | sed "s/$val/$newval/"`;fi;echo $l >> new_${f};unset val;done

s333 · 2017-04-26 18:04:07 19
check if ufw (uncomplicated firewall) is enabled in bash

Show Sample Output
This is sample output - yours may be different.
```
disabled
```
0

if grep ENABLED=yes /etc/ufw/ufw.conf>/dev/null; then echo "enabled"; else echo "disabled"; fi

phrik · 2017-05-04 07:15:48 20
test and send email via smtps using openssl client
This is sample output - yours may be different.
0

(sleep 1;echo EHLO MAIL;sleep 1;echo "MAIL FROM: <a@foo.de>";sleep 1;echo "RCPT TO: <b@bar.eu>";sleep 1;echo DATA;sleep 1;echo Subject: test;sleep 1;echo;sleep 1;echo Message;sleep 1;echo .;sleep 1;)|openssl s_client -host b.de -port 25 -starttls smtp

idella · 2017-05-06 17:53:38 23
File count into directories

Show file count into directories. Usefull when you try to find hugh directories that elevate system CPU (vmstat -> sy) Show Sample Output
This is sample output - yours may be different.
```
76 -> /opt/node-v6.9.1-linux-x64/include/node/openssl
82 -> /opt/node-v6.9.1-linux-x64/lib/node_modules/npm/node_modules
97 -> /opt/kingsoft/wps-office/office6
152 -> /opt/kingsoft/wps-office/office6/chart/styles
```
0

find / -type d | while read i; do ls $i | wc -l | tr -d \\n; echo " -> $i"; done | sort -n

Zort · 2017-05-12 00:02:43 19
split email by @ with awk

splitting email by @ with awk Show Sample Output
This is sample output - yours may be different.
```
xxx.com
```
0

echo $mail | awk -F'@' '{print $2}'

aysadk · 2017-05-24 22:36:28 17
Get the current epoch in base32
This is sample output - yours may be different.
0

obase=16; echo "$(date +%s)" | bc | xxd -r -p | base32

malathion · 2017-06-26 16:58:38 22
Get bucket policy from a s3 buckets list
This is sample output - yours may be different.
0

for i in (aws s3api list-buckets --query "Buckets[].Name" | cut -d"," -f1 | grep -vE "\[|\]"); echo $i ; aws s3api get-bucket-policy --bucket (echo $i | xargs); end

tuannvm · 2017-07-19 15:56:54 19
send attachment file email
This is sample output - yours may be different.
0

echo "This is the message body" | mutt -a "/path/to/file.to.attach" -s "subject of message" -- recipient@domain.com

aysadk · 2017-07-28 13:58:10 17
Disable password expiration and clear password history for VMware vcenter appliance

Disable password expiration and clear password history for VMware vcenter appliance
This is sample output - yours may be different.
0

chage -M -1 root; echo "" > /etc/security/opasswd

tsener · 2017-07-30 21:26:43 52
send attachment email shell
This is sample output - yours may be different.
0

echo "This is the message body" | mutt -a "/tmp/aysad.gz" -s "Vv..Pp..nn" -- aysad@gmail.com

aysadk · 2017-08-25 22:12:31 30
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Throttling Bandwidth On A Mac

sudo ipfw pipe 1 config bw 50KByte/s Set the bandwidth (bw) limit to any number you want. For example you could have a 15kb pipe for X application and then a 100kb pipe for another application and attach things to those pipes. If a port isn’t attached to a pipe, it runs at full speed. Change the number (in this case 1) to a different number for a different pipe. The next step is to attach your port. sudo ipfw add 1 pipe 1 src-port 80 In this case anything on port 80 (http) will be set to a limit of 50Kbyte/s. If you want to attach a second port to this pipe, repeat the command but change the port number at the end. src : http://www.mactricksandtips.com/2008/12/throttling-bandwidth-on-a-mac.html

An easter egg built into python to give you the Zen of Python

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"

count the number of specific characters in a file or text stream

In this example, the command will recursively find files (-type f) under /some/path, where the path ends in .mp3, case insensitive (-iregex). It will then output a single line of output (-print0), with results terminated by a the null character (octal 000). Suitable for piping to xargs -0. This type of output avoids issues with garbage in paths, like unclosed quotes. The tr command then strips away everything but the null chars, finally piping to wc -c, to get a character count. I have found this very useful, to verify one is getting the right number of before you actually process the results through xargs or similar. Yes, one can issue the find without the -print0 and use wc -l, however if you want to be 1000% sure your find command is giving you the expected number of results, this is a simple way to check. The approach can be made in to a function and then included in .bashrc or similar. e.g. $ count_chars() { tr -d -c "$1" | wc -c; } In this form it provides a versatile character counter of text streams :)

Top ten memory hogs

Inspired by #7065

"What the hell is running on?!" Easily snoop your system's RAM consumption

Works on most unixes, on OpenBSD replace the "-g" parameter at the sort with a "-n".

Get line count for any file ending with extension recursively rooted at the current directory.

find file/dir by excluding some unwanted dirs and filesystems

Consider using this cmd when: 1. You are planning to traverse a big directory. 2. There is a subdir you don't want find to decend to. (entirely ignore) 3. You don't want find to decend to any mounted filesystems under this dir. * The -xdev flag tells find do not go to other filesystems. * -path ./junk_dir -prune is the pattern to ignore ./junk_dir entirely. * The rest is the typical search and print. To ignore multiple subdirs, you can just iterate the pattern, e.g. find . -path ./junk1 -prune -o -path ./junk2 -prune ... If you do want to include other filesystems, then remove -xdev flag. If you want to search files, then change -type d to -type f.

Do a search-and-replace in a file after making a backup

generate iso

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Commands using echo (1,545)

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