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Scan all open ports without any required program
This is sample output - yours may be different.
5

for i in {1..65535}; do (echo < /dev/tcp/127.0.0.1/$i) &>/dev/null && printf "\n[+] Open Port at\n: \t%d\n" "$i" || printf "."; done

emphazer · 2019-05-21 09:34:15 5
Clear terminal Screen

Probably the quickest / easiest way to clear the screen.
This is sample output - yours may be different.
2

<ctrl+l>

vicgedris · 2019-06-12 18:24:56 1

Find which directory in one filesystem that contains most inodes or files. Show Sample Output

find / -xdev -printf '%h\n' | sort | uniq -c | sort -k 1 -n | tail

Raboo · 2019-05-24 12:01:30 0

Filter the output of a file continously using tail and grep
This is sample output - yours may be different.
1

tail -f path | grep your-search-filter

gmadorell · 2019-05-30 14:08:39 0
Filter the output of a file continously using tail and grep

The OPs solution will work, however on some systems (bsd), grep will not filter the data, unless the --line-buffered option is enabled.
This is sample output - yours may be different.
1

tail -f $FILENAME | grep --line-buffered $PATTERN

FluffyBrick · 2019-05-30 21:01:59 0

get the full description of a randomly selected package from the list of installed packages on a debian system

I put this command on my ~/.bashrc in order to learn something new about installed packages on my Debian/Ubuntu system each time I open a new terminal Show Sample Output

dpkg-query --status $(dpkg --get-selections | awk '{print NR,$1}' | grep -oP "^$( echo $[ ( ${RANDOM} % $(dpkg --get-selections| wc -l) + 1 ) ] ) \K.*")

acavagni · 2019-06-01 13:24:07 0

tmux start new session with title and execute command

in this examp start htop command in tmux session over the shell cosole and set title for the tmux without doing it manuelly in tmux
This is sample output - yours may be different.
1

tmux new-session -d -s "SessionName" "htop"

aysadk · 2019-06-14 12:44:33 0
Identifies the file types in a directory and adds or replaces their file extensions.

It tries to identify the file types in a directory and adds or replaces them with their appropriate extensions. Please, update the "file" tool before use it (last version: 5.37): https://github.com/file/file
This is sample output - yours may be different.
0

find "$(realpath .)" -type f -exec bash -c 'p="{}"; b="${p##*/}"; e=${b#"${b%.*}"}; e2=$(file -b -F="" --extension "$p"| awk -F/ '\''$1~/^\w+$/ {print $1} '\''); if [ "$e" != ".$e2" ] && [ ! -z $e2 ]; then mv "$p" "${p%$b}${b%$e}.$e2"; fi;' \;

mikhail · 2019-05-18 01:56:25 0
PHP7 - Fix incompatibility errors like: Parse error: syntax error, unexpected new (T_NEW) in file.php on line...

New objects cannot be assigned by reference. The result of the new statement can no longer be assigned to a variable by reference. Check the "Sample Output" example ("sample.php"). The Output of the above example in PHP 5: "Deprecated: Assigning the return value of new by reference is deprecated in sample.php on line 3". Output of the above example in PHP 7: "Parse error: syntax error, unexpected 'new' (T_NEW) in sample.php on line 3. Show Sample Output
This is sample output - yours may be different.
```
echo -e "<?php\nclass C {}\n\$c =& new C;\n?>" > sample.php
cat sample.php
<?php
class C {}
$c =& new C;
?>
busybox sh -c 'find "$(realpath ./)" -type f $ -iname "*.php" -or -iname "*.inc" $ -exec sed -i -r "s~=[[:space:]]*&[[:space:]]*new[[:space:]]+~= new ~gi" {} \; '
cat sample.php
<?php
class C {}
$c  = new C;
?>
```
0

find "$(realpath ./)" -type f $ -iname "*.php" -or -iname "*.inc" $ -exec sed -i -r "s~=[[:space:]]*&[[:space:]]*new[[:space:]]+~= new ~gi" {} \;

mikhail · 2019-05-29 18:20:45 0
get a rough estimate about how much disk space is used by all the currently installed debian packages

The vaule is expressed in megabytes Show Sample Output
This is sample output - yours may be different.
```
$ echo $[ ($(dpkg-query -s $(dpkg --get-selections | grep -oP '^.*(?=\binstall)') | grep -oP '(?<=Installed-Size: )\d+' | tr '\n' '+' | sed 's/+$//')) / 1024 ]
4506
```
0

echo $[ ($(dpkg-query -s $(dpkg --get-selections | grep -oP '^.*(?=\binstall)') | grep -oP '(?<=Installed-Size: )\d+' | tr '\n' '+' | sed 's/+$//')) / 1024 ]

acavagni · 2019-06-02 16:35:34 0
WSL: Change the current directory converting a Windows path to a Linux Path

The Windows Subsystem for Linux (WSL) is a compatibility layer for running binary Linux executables natively in Windows. A folder such as "C:\Program Files (x86)\Common Files" is represented as "/mnt/c/Program Files (x86)/Common Files". This function allows you to change the current directory to a Windows folder. Show Sample Output
This is sample output - yours may be different.
```
function _cd() { local dir="$(echo -n "${*//'\'/"/"}" |  sed -e 's~$[a-z]$:~/mnt/\L\1~gi')";  if [ -d "$dir" ]; then cd "$dir"; fi; }

# double quotes are necessary:
_cd "C:\Program Files (x86)\Common Files";

# result: cd "/mnt/c/Program Files (x86)/Common Files"
```
0

function _cd() { local dir="$(echo -n "${*//'\'/"/"}" | sed -e 's~$[a-z]$:~/mnt/\L\1~gi')"; if [ -d "$dir" ]; then cd "$dir"; fi; }

mikhail · 2019-06-06 17:53:28 0
Slugify: converts strings in any language into Slugs (friendly names to use in URLs and filenames)

Slug the part of an URL which identifies a page using human-readable keywords. Slugs are used to construct friendly URLs (often for permalinks) that are easy to type, descriptive, and easy to remember. Show Sample Output
This is sample output - yours may be different.
```
function slugify() { echo "$@" | iconv -c -t ASCII//TRANSLIT//IGNORE | sed -r -e 's~[^[:alnum:]]+~ ~g' -e 's~^ *~~;s~ *$~~' -e 's~ +~-~g' | tr A-Z a-z; }


# testing special characters and spaces:
slugify " Test: µÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝß      and àáâãäåæçèéêëìíîïðñòóôõöøùúûüýÿ ";

# output:
test-uaaaaaaaeceeeeiiiidnoooooouuuuyss-and-aaaaaaaeceeeeiiiidnoooooouuuuyy
```
0

function slugify() { echo "$@" | iconv -c -t ASCII//TRANSLIT//IGNORE | sed -r -e 's~[^[:alnum:]]+~ ~g' -e 's~^ *~~;s~ *$~~' -e 's~ +~-~g' | tr A-Z a-z; }

mikhail · 2019-06-08 17:45:57 0
Convert epoch date to human readable date format in a log file.
This is sample output - yours may be different.
0

cat /var/log/mosquitto/mosquitto.log | awk -F : '{"date -d @"$1 |& getline D; print D, $0}'

ifebi · 2019-06-09 07:35:25 0
Find Apache Root document

Where is my Apache public_html ?!
This is sample output - yours may be different.
0

grep -i 'DocumentRoot' /usr/local/apache/conf/httpd.conf

locvfx · 2019-06-09 15:48:13 0
get a list of top 1000 sites from alexa

a little bit smarter & i only want .de domains, so ..... Show Sample Output
This is sample output - yours may be different.
```
amazon.de
google.de
ebay.de
ebay-kleinanzeigen.de
spiegel.de
web.de
bild.de
t-online.de
poe.trade
mobile.de
chip.de
```
0

curl -qsSl http://s3.amazonaws.com/alexa-static/top-1m.csv.zip 2>/dev/null | zcat | grep ".de$" | head -1000 | awk -F, '{print $2}'

dbiesecke · 2019-06-12 02:48:42 0
automatically generate the ip/hostname entry for the /etc/hosts in the current system

I use it after a clean CentOS 7 minimal server installation to automatically populate the /etc/hosts file. Not sure why the installation does not add this entry by itself. Tested on CentOS 7 with the simplest use case: 1 static ip address and the hostname provided during installation. Show Sample Output
This is sample output - yours may be different.
```
[root@dns-server ~]# echo "$(ip addr show dev $(ip r | grep -oP 'default.*dev \K\S*') | grep -oP '(?<=inet )[^/]*(?=/)') $(hostname -f) $(hostname -s)"
10.0.2.10 dns-server.mydomain.lab dns-server

[root@dns-server ~]# echo "$(ip addr show dev $(ip r | grep -oP 'default.*dev \K\S*') | grep -oP '(?<=inet )[^/]*(?=/)') $(hostname -f) $(hostname -s)" >> /etc/hosts

[root@dns-server ~]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
10.0.2.10 dns-server.mydomain.lab dns-server
```
0

echo "$(ip addr show dev $(ip r | grep -oP 'default.*dev \K\S*') | grep -oP '(?<=inet )[^/]*(?=/)') $(hostname -f) $(hostname -s)"

acavagni · 2019-06-15 16:40:38 0
Clear terminal Screen
This is sample output - yours may be different.
-1

tput clear

mpb · 2019-06-12 17:51:31 0
Clear terminal Screen
This is sample output - yours may be different.
-1

clear

vicgedris · 2019-06-12 18:21:51 0

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File rotation without rename command

Rotates log files with "gz"-extension in a directory for 7 days and enumerates the number in file name. i.e.: logfile.1.gz > logfile.2.gz I needed this line due to the limitations on AIX Unix systems which do not ship with the rename command.

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

Calculate days on which Friday the 13th occurs

I removed the dependency of the English language

netcat as a portscanner

processes per user counter

awk is evil!

Replicate a directory structure dropping the files

Here is how to replicate the directory structure in the current directory to a destination directory (given by the variable DESTDIR), without copying the files.

Convert mkv to SVCD/DivX

ffmpeg supports mkv

create a new script, automatically populating the shebang line, editing the script, and making it executable.

The first argument is the interpreter for your script, the second argument is the name of the script to create.

generate iso

list files recursively by size

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All commands (18)

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