willl keep all usefull commands here

commands

 # for setting node path in windows
 setx NODE_PATH "%NODE_PATH%;C:\Users\winbdows 7\AppData\Roaming\npm\node_modules"

FFMPEG cmd for

ffmpeg -i myvdo.wmv -c:v libx264 -crf 23 -profile:v high -r 30 -c:a libvo_aacenc -q:a 100 -ar 48000 output.mp4

http://www.catswhocode.com/blog/19-ffmpeg-commands-for-all-needs

ffmpeg -i manishVideo.mp4 -crf 25 MP1.mp4

crf is 18 to 25 compression ratio factor

sudo ln -s /home/ubuntu/hub/api/v0

pahle wahaa chale jao jahaa symlink bnana kr rkhna hai
ln -s <path of the directory to be going to symlink>

and jab bhi revert krna hoga tab normally jahaa main directory hai usko copy kr k symlink wali jagah pr rakh dena hai.. symlink ko rename kr k.

// For finding size of the directory

du -sh file_path

for search in two name of the file

dpkg -l | grep '\(php\|mysql\)'

zip file but exclude some directory.

zip -r myarchive.zip dir1 -x dir1/ignoreDir1/**\* dir1/ignoreDir2/**\*

to check lets encrypt expiry.

echo | openssl s_client -connect <you server here>:443 2>/dev/null | openssl x509 -noout -dates

for creating symlinks / shortcut path

sudo ln -s <path of the actuall folder> <symlink name with the path or (if you are on same directory so simply folder name)>

for search in all places,

sudo find ./ -xdev -type f -print0 | xargs -0 grep -H "800x600"

for saving output in a file.

SomeCommand > SomeFile.txt

https://askubuntu.com/a/420983/652975

To insert the record in the log file by php.

$value) { if (preg_match('/^HTTP_/',$name)) { $name = strtr(substr($name,5),'_',' '); $name = ucwords(strtolower($name)); $name = strtr($name,' ','-'); $headerList[$name] = $value; } } $data = sprintf("%s %s %s\n", $_SERVER['REQUEST_METHOD'], $_SERVER['REQUEST_URI'], $_SERVER['SERVER_PROTOCOL']); foreach ($headerList as $name => $value) { $data .= $name.': '.$value."\n"; } $data .= "\n"; $data .= "\n now we will show request data"; $data .= var_export($_REQUEST, true); file_put_contents($targetFile, $data.file_get_contents('php://input')."\n"); } logRequest("tmp/post-".time().".log"); ?>

to setup htpasswd in nginx server.

sudo apt-get install apache2-utils
sudo htpasswd -c /etc/nginx/.htpasswd nginx
cat /etc/nginx/.htpasswd
sudo nano /etc/nginx/sites-available/default

then add this two line in location code

    auth_basic "Private Property";
    auth_basic_user_file /etc/nginx/.htpasswd;

then restart the server.
sudo service nginx reload

and your username would be: nginx
and password:

to set time on ubuntu server.

sudo dpkg-reconfigure tzdata

for find node (number of files) in a directory.

for i in $(find -maxdepth 1 -type d); do echo -ne "${i/.\/}\t"; find $i -printf "%i\n" | sort -u | wc -l; done | awk '{ print $2,$1}' | sort -k2

Find and replace in all files.
first, go that folder path. then

With the g flag to replace all the occurrences on a line.
find ./ -type f -exec sed -i 's/string1/string2/g' {} \;

For global case insensitive:
find ./ -type f -exec sed -i 's/string1/string2/gI' {} \;

find and kill any port number.

Find:
lsof -i :3000
Kill:
kill -9

to find last 30 days changes in files

find app/ -type f -mtime -2 -exec ls -l {} \; > last30days.txt

to search

grep -rl "Mindestbestellmenge" app/design/

for find latest edited / modified file name

find ./ -printf '%T+ %p\n' | sort -r | head

for search word in a file and display that line

sudo grep -R fastcgi_pass /etc/nginx/sites-enabled/ | grep -Ev '#\s+fastcgi_pass'

replace in particular file use this command.

sudo sed -i --follow-symlinks \ 's|php7.4-fpm.sock|php8.0-fpm.sock|g' \ /etc/nginx/sites-enabled/default

here in the last line you just need to write file path

uninstall the particular version

sudo apt -y purge php7.4*

understanding docker. you can run simple hello word page on plane machine.
https://github.com/karthequian/docker-helloworld

sudo docker pull karthequian/helloworld:latest
sudo docker run -p 80:80/tcp "karthequian/helloworld:latest"

for listing all docker

sudo docker ps -a

to load container that configuration saved in yml file.

sudo docker-compose -f /srv/docker-compose.yml up -d

if have multiple php installed on server and wanted to choose which version is primary in use.

sudo update-alternatives --config php

#For breaking files into multiple parts use this command from the git bash command line.

split prod-db-backup-220920221.sql -l 100000

#This will break your file into lines of 1lakh line per file.

if you wanted to break it in memory so you can also do it by command

into files of size 500MB each: split myLargeFile.txt -b 500m

list out the last updated files.

find . -type f -newermt "-24 hours" 
find . -type f -newermt "-10 minutes" 
find . -type f -newermt "1 day ago" 
find . -type f -newermt "yesterday"

to kill particular port.
sudo npx kill-port 5432

clear memory cache from Linux ubuntu.
sync; echo 3 | sudo tee /proc/sys/vm/drop_caches

for renew the letsencrypt certificates.

sudo certbot renew

Create alias in ubuntu

nano ~/.bashrc

write something alias like below.

alias apachelog='cd /var/log/apache2'
alias cronlog='cd /var/log/mysite/cron'
alias egrep='egrep --color=auto'
alias fdate='date "+%Y%m%d.%H%M%S"'
alias fgrep='fgrep --color=auto'
alias grep='grep --color=auto'
alias l='ls -CF'
alias la='ls -A'
alias ll='ls -alF'
alias ls='ls --color=auto'
alias n='nano'
alias site='cd /var/www/vhosts/mywebsite/httpdocs'
alias sitelog='cd /var/log/mywebsite/httpdocs'
alias findinsite="searchin(){ find /var/www/vhosts/mywebsite/httpdocs/ -xdev \( -path '*/.git/*' -o -path '*/.svn/*' -o -path '*/assets/css/*' -o -path '*/assets/js/*' \) -prune -o -type f -exec grep -H -e \"\$*\" {} +;}; searchin"
alias findincrm="searchincrm(){ find /var/www/vhosts/mywebsite/crm-v2/ -xdev ! -path '/var/www/vhosts/mywebsite/crm-v2/.git/*' ! -path '/var/www/vhosts/mywebsite/crm-v2/old_vendor/*' -type f -exec grep -H -e \"\$1\" {}>

After saving the file, please run source cmd to get it executable.

source ~/.bashrc

then you can run this directly like
findinsite HelloWorld

for renew the letsencrypt certificates.

sudo certbot renew

To check SSL Date range:

echo | openssl s_client -connect 13.xxx.xxx.91:443 2>/dev/null | openssl x509 -noout -dates

Find all files based on extensions related

find . -name \*.log -ls | sort -r -n -k7