10 Daily Linux Questions and Answers Series (part 10)

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In this brief article, I present 10 essential Linux questions along with their answers.
This foundational knowledge is crucial for anyone seeking to master Linux.

Q1: How do you use cut to extract a username from /etc/passwd where UID is greater than 1000?
You would use awk first to filter based on UID, then cut to extract the username.

Q2: How do you display only the first 5 characters of each line from a file?

cut -c 1-5 filename

Q3: Can cut handle negative indexing like extracting the last column?
No, cut does not support negative indexing.

Q4: How do you use cut in a script to extract specific fields dynamically?
You can use variables in the script to specify fields dynamically.

Q5: What is the difference between cut -f and cut -c?
-f extracts fields, while -c extracts specific characters.

Sed Command
Q6: How do you sort a file in ascending and descending order using the sort command?
• Ascending:
sort filename
• Descending:
sort -r filename

Q7: How do you sort a file numerically instead of lexicographically?