utils

utils

SSH legacy

ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 123.123.123.123

source: https://unix.stackexchange.com/questions/340844/how-to-enable-diffie-hellman-group1-sha1-key-exchange-on-debian-8-0

Comprimir / Descomprimir

Archivos .tar.gz:
Comprimir: tar -czvf empaquetado.tar.gz /carpeta/a/empaquetar/
Descomprimir: tar -xzvf archivo.tar.gz

Archivos .tar.bz2
Comprimir: tar -jcfv empaquetado.tar.gz /carpeta/a/empaquetar/
Descomprimir: tar -jxfv archivo.tar.gz

Archivos .tar:
Empaquetar: tar -cvf paquete.tar /dir/a/comprimir/
Desempaquetar: tar -xvf paquete.tar

Archivos .gz:
Comprimir: gzip -9 index.php
Descomprimir: gzip -d index.php.gz

Archivos .zip:
Comprimir: zip archivo.zip carpeta
Descomprimir: unzip archivo.zip

Borrar completamente paquetes, hasta sus ficheros de configuracion

dpkg --purge $(dpkg --list | grep ^rc | awk  '{ print $2; }')

Change Encoding:

iconv -f old-encoding -t new-encoding file.txt > newfile.txt

Supported encodings with (that's a lower-case L, not a one):

iconv -l

Echo coloreados

black='\E[30;47m'
red='\E[31;47m'
green='\E[32;47m'
yellow='\E[33;47m'
blue='\E[34;47m'
magenta='\E[35;47m'
cyan='\E[36;47m'
white='\E[37;47m'

\033[1m -> BOLD
\033[0m -> NORMAL

Readme.md resources

Code highlight list: https://github.com/github/linguist/blob/master/lib/linguist/languages.yml
MD Help: https://help.github.com/categories/writing-on-github/

Change MKV audio position and default ffmpeg

ffmpeg -i input.mkv -map 0:v:0 -map 0:a:1 -map 0:a:2 -map 0:a:0 -disposition:a:0 default -disposition:a:1 none -disposition:a:2 none -c copy output.mkv

Find text in files

grep -rnw '/path/to/somewhere/' -e 'pattern'

-r or -R is recursive, -n is line number, and -w stands for match the whole word. -l (lower-case L) can be added to just give the file name of matching files.

Along with these, --exclude, --include, --exclude-dir flags could be used for efficient searching:

This will only search through those files which have .c or .h extensions:

    grep --include=\*.{c,h} -rnw '/path/to/somewhere/' -e "pattern"

This will exclude searching all the files ending with .o extension:

    grep --exclude=*.o -rnw '/path/to/somewhere/' -e "pattern"

For directories it's possible to exclude a particular directory(ies) through --exclude-dir parameter. For example, this will exclude the dirs dir1/, dir2/ and all of them matching *.dst/:

    grep --exclude-dir={dir1,dir2,*.dst} -rnw '/path/to/somewhere/' -e "pattern"

Regular Expressions

1 - IPv4

^((^|\.)((25[0-5])|(2[0-4]\d)|(1\d\d)|([1-9]?\d))){4}$

2 - Netmask

^(((255\.){3}(255|254|252|248|240|224|192|128|0+))|((255\.){2}(255|254|252|248|240|224|192|128|0+)\.0)|((255\.)(255|254|252|248|240|224|192|128|0+)(\.0+){2})|((255|254|252|248|240|224|192|128|0+)(\.0+){3}))$

https://www.regextester.com/97579

1 - MAC Address

^((^|\:)([0-9A-Fa-f][0-9A-Fa-f])){6}$

php background process using exec function

You have to reroute programs output somewhere too, usually /dev/null

exec($cmd . " > /dev/null &");

SQLite

EPOCH time

SELECT strftime('%s','now');

Memory leaks

Fugas de Memoria

GIT keys SSH

$ ssh-keygen -t rsa -b 4096 -C "[email protected]"

Permisos 700

$ eval "$(ssh-agent -s)"
$ ssh-add ~/.ssh/id_rsa

Add colored GIT

Add these lines in .bashrc

parse_git_branch() {
 git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/(\1)/'
}
if [ "$color_prompt" = yes ]; then
 PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[01;31m\]$(parse_git_branch)\[\033[00m\]\$ '
else
 PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w$(parse_git_branch)\$ '
fi
unset color_prompt force_color_prompt

More options, see https://github.com/artzaik/gitstuff

Add user to shared folder in Virtualbox

sudo adduser $USER vboxsf

How to Add SSH Public Key to Server

ssh-copy-id -i ~/.ssh/id_rsa.pub YOUR_USER_NAME@IP_ADDRESS_OF_THE_SERVER

More: https://linuxhandbook.com/add-ssh-public-key-to-server/

ssh SOCKSv5

ssh -p443 -D4445 -N [email protected]

-p is your proxy computer ssh port -D is de socksv5 port -N is not to start shell

After that, you have to configure socksv5 in firefox. url: localhost, port 4445

fuck off firewall!

Restore deleted commit

git reflog is your friend. Find the commit that you want to be on in that list and you can reset to it (for example:git reset --hard e870e41).

(If you didn't commit your changes... you might be in trouble - commit early, and commit often!)

https://stackoverflow.com/questions/10099258/how-can-i-recover-a-lost-commit-in-git

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