todo

[awk] Run and understand: Output calculation results from a file containing numerical values

[Shell Script] Run and understand conditional branching using if and else

[sed] Run and understand Add a string to a specified line number in a file

[sed] Run and understand Replace a given string with a specified character

[awk] Run and understand conditional branching using and in if statement

[awk] Run and understand Add else to if statement to output non-matching string

[awk] Run and understand: Display more than the specified number of lines in an if statement

[awk] Run and understand: Display the PATH environment variable by PATH

[read] Execute and understand. Assign user input to variables and display.

[Shell] Run and understand: How to handle strings containing spaces