Find large sized files

For example, find files of more than 100MB in size

cd /

find . -type f -size +100000k -exec ls -lh {} \; | awk '{ print $9 ": " $5 }' 




Find latest modified files in current directory and subdirectories

find . -type f -print0 | xargs -0 stat --format '%Y :%y %n' | sort -nr | cut -d: -f2- | head

The following command will provide top 20 files of the above command, (useful when there is long unnecessay list)

find . -type f -print0 | xargs -0 stat --format '%Y :%y %n' | sort -nr | cut -d: -f2- | head -n20

notice the -n20 at the end of the command

Find file by name

find / -name filename

Find size of a directory (including all sub contents)

du -hsc /directory/

Compress directory / Uncompress

tar -cvzf filename.tar.gz folderToCompress 
#change the -c to -x to above to extract

Note: this compressing command does not make any change in the source folder 
(leaves unchanged)

to uncompressed the above mentioned compressed folder

tar -xvzf filename.tar.gz 

# This command does not make any change to the compressed gz file (leaves unchanged). It extracts the directory/files in the current directory

How to run a service in background

service-command > /dev/null 2>&1 &

How to find system CPU information
#lscpu

How to download youtube videos on linux computer

Downloading playlist
example
youtube-dl -o "%(playlist_index)s-%(title)s.%(ext)s" https://www.youtube.com/playlist?list=PLhDZ7rwW_JLXzDe8GCIuPcsZxYohZNRT3