basic_linux_commands

ls -lhS # sort in reverse order
ls -lhSr # sort in ascending order
ls -lhS | head -11 # get 10 big files
ls -lahS # include hidden files
ls -lRS # recursively sort files including subdirectories

du -ah | sort -hr #recursively sort files throughout system 


ls -l new.txt fff 2>> combined.txt >> combined.txt # combined.txt will add stderr and then stdout

Ref: https://linuxhandbook.com/sort-files-by-size/


There are three data streams. One input, stdin (0) and two output data streams stdout (1) and stderr (2).
Keyboard is the default stdin device and the screen is the default output device.
Output redirection is used with > or >> (for append mode).
Input redirection is used with <.


yogendra@dd clout % ls -l new.txt fff 2>&1 > combined.txt
ls: fff: No such file or directory
yogendra@dd clout % cat combined.txt
-rw-r--r--  1 yogendra  staff  0 Feb 18 15:51 new.txt
yogendra@dd clout % ls -l new.txt fff 2>&1 |> combined.txt
yogendra@dd clout % cat combined.txt
ls: fff: No such file or directory
-rw-r--r--  1 yogendra  staff  0 Feb 18 15:51 new.txt
yogendra@dd clout %


The stderr can be redirected using 2> or 2>>.
The stderr and stdout can be combined using 2>&1.


# find file insensitive search
alias find_file="find / -iname $1 2> /dev/null"




# Script to split a string based on the delimiter

my_string="Ubuntu;Linux Mint;Debian;Arch;Fedora"
IFS=';' read -ra my_array <<< "$my_string"

#Print the split string
for i in "${my_array[@]}"
do
    echo $i
done

# list size of directory with of depth2
 du -h -d2 .