sort

; sort the file content ( sort lines in ascending or descending order )

; > -o  Specifies an output file for the sorted data. Functionally equivalent to redirecting output to a file.
; > -r  Sorts data in reverse order (descending).
; > -n  Sorts a file numerically (interprets data as numbers).
; > -nr Sorts a file with numeric data in reverse order. Combines -n and -r options.
; > -k  Sorts a table based on a specific column number.
; > -c  Checks if the file is already sorted and reports any disorder.
; > -u  Sorts and removes duplicate lines, providing a unique sorted list.
; > -M  Sorts by month names.


> cat first.txt

; the basic syntax of the sort command is:
> sort first.txt

; To sort numbers in numerical order, you can use the -n option.
> sort -n first.txt

; The sort command can also be used to sort lines based on specific fields using the -k option.
> sort -k 2 first.txt