All commands from the last month sorted by votes

All commands (28)

sorted by

Show which programs are listening on TCP ports

Alternative: ss -tlpn Show Sample Output

netstat -tlpn

maxo · 2019-03-21 07:51:20 2

grep expression (perl regex) to extract all ip addresses from both ip and ifconfig commands output

It uses the following GNU grep options: "-o" which shows only the matching part of the line and "-P" which allows the use of Perl regular expressions. Show Sample Output
This is sample output - yours may be different.
```
[root@docker ~]# ip a | grep -oP '(?<=inet |addr:)(?:\d+\.){3}\d+'
127.0.0.1
10.0.2.15
172.17.0.1

[root@docker ~]# ifconfig  | grep -oP '(?<=inet |addr:)(?:\d+\.){3}\d+'
96.126.108.191
192.168.135.145
127.0.0.1
```
4

ip a | grep -oP '(?<=inet |addr:)(?:\d+\.){3}\d+'

acavagni · 2019-03-21 20:53:06 0
website recursive offline mirror with wget

website recursive offline mirror with wget
This is sample output - yours may be different.
4

wget --mirror --convert-links --adjust-extension --page-requisites --recursive --no-parent www.example.com

aysadk · 2019-03-24 21:13:55 0
Set pcap & SUID Bit for priv. network programs (like nmap)
This is sample output - yours may be different.
2

export BIN=`which nmap` && sudo setcap cap_net_raw,cap_net_admin+eip $BIN && sudo chown root $BIN && sudo chmod u+s $BIN

dbiesecke · 2019-03-27 16:04:07 0
Calculate the distance between two geographic coordinates points (latitude longitude)

The Haversine formula determines the great-circle distance between two points on a sphere given their longitudes and latitudes. Show Sample Output
This is sample output - yours may be different.
```
# input (format: latitude1 longitude1 latitude2 longitude2) :

h -22.9077611 -43.1259322 -22.9121089 -43.2301558

# output:
10.6889

# So, the distance between -22.9077611 (latitude),-43.1259322 (longitude) and -22.9121089,-43.2301558 (latitude,longitude) is 10,688.9 meters (10.6889 kilometers)
```
2

h(){ echo $@|awk '{d($1,$2,$3,$4);} function d(x,y,x2,y2,a,c,dx,dy){dx=r(x2-x);dy=r(y2-y);x=r(x);x2=r(x2);a=(sin(dx/2))^2+cos(x)*cos(x2)*(sin(dy/2))^2;c=2*atan2(sqrt(a),sqrt(1-a)); printf("%.4f",6372.8*c);} function r(g){return g*(3.1415926/180.);}';}

mikhail · 2019-04-04 01:34:36 1
To create files with specific permission:
This is sample output - yours may be different.
2

install -b -m 777 /dev/null file.txt

wuziduzi · 2019-04-13 02:52:35 0
Check every URL redirect (HTTP status codes 301/302) with curl
This is sample output - yours may be different.
1

curl -sLkIv --stderr - https://exemple.com | awk 'BEGIN{IGNORECASE = 1};/< location:/ {print $3}'

rolanda · 2019-03-25 14:47:20 0
Application network trace based on application name

This command takes an application name as an argument and then it will listen to the tcp traffic and capture packets matching the process Id of the application. The output shows: local address / local port / Remote Address / Remote port / State / Owning Process ID Show Sample Output
This is sample output - yours may be different.
```
192.168.0.1                      50306     8.8.8.8                       443        Established Internet       21128
```
1

while(1 -eq 1 ) {Get-Process -Name *APPNAME* | Select-Object -ExpandProperty ID | ForEach-Object {Get-NetTCPConnection -OwningProcess $_} -ErrorAction SilentlyContinue }

guillaume1306 · 2019-03-26 09:44:57 1
du command without showing other mounted file systems
This is sample output - yours may be different.
1

du -h --max-depth=1 --one-file-system /

Ryangillan · 2019-04-02 22:47:24 0
worse alternative to <ctrl+r>

worse alternative to ctrl+r: grep the history removing duplicates without sorting (case insensitive search). Show Sample Output
This is sample output - yours may be different.
```
history # history sample for reference:
1 echo "duplicate"
2 awk --help
3 echo "duplicate"
4 echo "ctrl+r is better"

# input:
memo echo

# output:
echo "duplicate"
echo "ctrl+r is better"
```
1

function memo() { history | grep -i $@ | awk '! seen[$2]++'; }

mikhail · 2019-04-04 00:54:43 0
SSH Copy ed25519 key into your host
This is sample output - yours may be different.
1

ssh-copy-id -i your-ed25519-key user@host

fromthestone · 2019-04-11 02:23:46 0

Determining if a String Contains a Substring in Bash

Show Sample Output

stringContains() { [ -z "${2##*$1*}" ] && [ -z "$1" -o -n "$2" ]; }

mikhail · 2019-04-12 20:51:27 0

See n most used commands in your bash history

You can append these commands to the bottom of the history file to access them easier with the Up key: sort ~/.bash_history|uniq -c|sort -n|tail -n 10|tr -s " "|cut -d' ' -f3- >> ~/.bash_history
This is sample output - yours may be different.
1

sort ~/.bash_history|uniq -c|sort -n|tail -n 10

knoppix5 · 2019-04-15 14:20:00 0
command shell generate random strong password

shell generate random strong password Show Sample Output
This is sample output - yours may be different.
```
NXuc2VjRcOhW7zyQDBhH
```
1

len=20; tr -dc A-Za-z0-9_ < /dev/urandom | head -c ${len} | xargs

aysadk · 2019-04-16 20:20:46 1
Bitcoin Brainwallet Private Key Calculator
This is sample output - yours may be different.
0

$ bitgen hex 12312381273918273128937128912c3b1293cb712938cb12983cb192cb1289b3 info

Label10 · 2019-03-27 21:25:29 1

Enable Synology Debug mode on shell

Added gdb & other usefull stuff Show Sample Output

sudo synogear install && sudo su

dbiesecke · 2019-03-30 03:45:12 1

Patator: A Hydra brute force alternative
This is sample output - yours may be different.
0

patator ssh_login host=192.168.1.16 port=22 user=FILE0 0=user.lst password=FILE1 1=pass.lst -x ignore:mesg='Authentication failed.'

ioshield · 2019-04-10 17:42:13 0
Remove multiple entries of the same command in .bash_history with preserving the chronological order

Only the first appearance of a repeated command in the history will be kept. Otherwise, if you prefer to keep last occurrence of a repeated command then maybe you can achieve that by including reverse input/output i.e with 'tac' command in expression above. To see statistics of removed repeated commands: diff --suppress-common-lines -y ~/.bash_history.bak ~/.bash_history|uniq -c|sort -n|tr -s " "|sed '/^ 1/d'|grep '<'
This is sample output - yours may be different.
0

cp -a ~/.bash_history ~/.bash_history.bak && perl -ne 'print unless $seen{$_}++' ~/.bash_history.bak >~/.bash_history

knoppix5 · 2019-04-15 12:39:09 0
Use was ec2 describe instances to retrieve IAM roles for specific ec2 tag to css list

This allows you to get all instance profiles (roles) for a given set of tags. Lists it in CSV Show Sample Output
This is sample output - yours may be different.
```
"arn:aws:iam::111114168247:instance-profile/Yourole-Instance-Profile,i-01ab14691695a0fa1"
```
0

aws ec2 describe-instances --region us-east-1 --filters "Name=tag:YourTag,Values=YourValue" | jq '.["Reservations"]|.[]|.Instances|.[]|.IamInstanceProfile.Arn + "," +.InstanceId'

symgryph · 2019-04-15 16:33:41 1
check web server port 80 response header

check web server port 80 response header Show Sample Output
This is sample output - yours may be different.
```
HTTP/1.1 200 OK
Server: Apache 2.4.1
Date: Wed, 17 Apr 2019 17:56:50 GMT
Content-Type: text/html
Content-Length: 307
Last-Modified: Sat, 14 Jan 2017 22:01:22 GMT
Connection: close
ETag: "587a9fb2-133"
X-Frame-Options: SAMEORIGIN
Accept-Ranges: bytes
```
0

(echo -e 'GET / HTTP/1.0\r\n\r\n';) | ncat <IPaddress> 80

aysadk · 2019-04-17 18:09:28 0
check web server port 80 response header
This is sample output - yours may be different.
0

curl -I <IPaddress>

maxo · 2019-04-18 06:38:59 0
Switch all connected PulseAudio bluetooth devices to A2DP profile

Tries to switch all audio devices to the A2DP profile for optimal sound quality. Useful for bluetooth speakers and headphones that always power up in HSP/HFP mode. Note however that this command is only a shorthand for the GUI, so it cannot fix stubborn BT controllers that leave your device stuck in HSP mode until a manual re-coupling.
This is sample output - yours may be different.
0

for card in $(pacmd list-cards | grep 'name: ' | sed 's/.*<$.*$>.*/\1/'); do pacmd set-card-profile $card a2dp_sink; done

lordtoran · 2019-04-18 18:01:45 0
Create a file and manipulate the date
This is sample output - yours may be different.
0

touch -d '-1 year' /tmp/oldfile

wuziduzi · 2019-04-19 17:01:16 0
Show your current network interface in use
This is sample output - yours may be different.
0

route | grep -m1 ^default | awk '{print $NF}'

wuziduzi · 2019-04-19 17:03:49 0
Network Discover in a one liner
This is sample output - yours may be different.
0

nmap -sn 192.168.1.0/24 -oG - | awk '$4=="Status:" && $5=="Up" {print $0}'|column -t

wuziduzi · 2019-04-19 17:12:00 0
1 2 >

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

Grab just the title of a youtube video

There's another version on here that uses GET but some people don't have lwp-request, so here's an alternative. It's also a little shorter and should work with most youtube URLs since it truncates at the first &

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" }

Add 10 random unrated songs to xmms2 playlist

If you're like me and want to keep all your music rated, and you use xmms2, you might like this command. I takes 10 random songs from your xmms2 library that don't have any rating, and adds them to your current playlist. You can then rate them in another xmms2 client that supports rating (I like kuechenstation). I'm pretty sure there's a better way to do the grep ... | sed ... part, probably with awk, but I don't know awk, so I'd welcome any suggestions.

Sort dotted quads

Sort a list of IPV4 addresses in numerical order. Great as a filter, or within vim using !}

Convert seconds to [DD:][HH:]MM:SS

Find name of package which installed a given shell command

Some command names are very different from the name of the package that installed them. Sometimes, you may want to find out the name of the package that provided a command on a system, so that you can install it on another system.

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"

Find the package that installed a command

Extract the MBR ID of a device

Useful when you want to know the mbrid of a device - for the purpose of making it bootable. Certain hybridiso distros, for eg the OpenSUSE live ISO uses the mbrid to find the live media. Use this command to find out the mbrid of your USB drive and then edit the /grub/mbrid file to match it.

Convert filenames from ISO-8859-1 to UTF-8

Nothing advanced, it just finds filenames that are stored with ISO-8859-1 characters and and converts those into UTF-8. Recommended to use without the --notest flag first so you can see what will be changed.

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)

All commands (28) 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…

All commands (28)

sorted by