How to use the uniq command: 2-Minute Linux Tips

The video tutorial explains the use of the 'unique' command in data processing, highlighting its limitations when used with the 'who' command due to differing output lines. It suggests using 'AWK' to reduce data to a single column before sorting and applying 'unique'. The importance of sorting is emphasized, as 'unique' only counts identical lines in succession. The tutorial concludes by demonstrating the '-c' option of 'unique' for counting occurrences.

What is the primary purpose of the 'unique' command?

• To create new directories

• To summarize and reduce information

• To encrypt data

• To delete duplicate files

Why is sorting necessary before using the 'unique' command?

• To ensure identical lines are in succession

• To enhance security

• To increase processing speed

• To reduce file size

What tool is used to filter data before passing it to 'unique'?

• Grep

• AWK

• Sed

• Find

What does the '-c' option do when used with the 'unique' command?

• Creates a copy of the output

• Counts the occurrences of each line

• Compresses the output

• Counts the number of unique files

How many users were logged in according to the final output with the '-c' option?

• One user logged in twice

• Three users logged in

• Two users logged in once each

• One user logged in once and another twice