Bash Shell Scripting - Command Substitution

The video tutorial explains command substitution in Linux, a feature that allows replacing a command with its output. It covers two methods: using backticks and the $() syntax. The tutorial demonstrates how to assign command outputs to variables and use them in shell scripts, with practical examples like extracting IP addresses and counting user sessions. The video concludes with a summary of the techniques discussed.

How does the dollar sign and parentheses method differ from back quotes for command substitution?

What is the significance of the 'who' command in the context of user sessions?

How can command substitution be used directly in an echo statement?

Summarize the two methods of command substitution discussed in the video.