10 Daily Linux Questions and Answers Series (part 10)

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? sort -n filename Q8: How do you sort a file based on a specific column? sort -k column_number filename Q9: How do you sort a file while ignoring case sensitivity? sort -f filename Q10: How do you remove duplicate lines while sorting? sort -u filename Stay tuned for part 11 coming tomorrow! Connect with me on LinkedIn #30DaysLinuxChallenge #RedHatEnterpriseLinux #CloudWhistler #CloudEngineer #Linux #DevOps #RedHat #OpenSource #CloudComputing #Automation #CloudEngineer

Apr 21, 2025 - 12:16

10 Daily Linux Questions and Answers Series (part 10)

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?

sort -n filename

Q8: How do you sort a file based on a specific column?

sort -k column_number filename

Q9: How do you sort a file while ignoring case sensitivity?

sort -f filename

Q10: How do you remove duplicate lines while sorting?

sort -u filename

Stay tuned for part 11 coming tomorrow!

Connect with me on LinkedIn

#30DaysLinuxChallenge #RedHatEnterpriseLinux
#CloudWhistler #CloudEngineer #Linux
#DevOps #RedHat #OpenSource
#CloudComputing #Automation
#CloudEngineer