Hello Everyone!
Hello Everyone!
Today marks Day 3 of my #90DaysOfDevOps Challenge, and I’m thrilled to share my journey so far! 🎉
As part of today's tasks, I explored several fundamental Linux commands that are essential for anyone stepping into DevOps. Here's a summary of what I worked on and learned:
Tasks and Learnings:
Task 1: View the content of a file and display line numbers.
\=> Command: cat
The cat command allows you to view the content of a file. To include line numbers, you can use the cat -n option.
Task 2: Change the access permissions of files to make them readable, writable, and executable by the owner only.
\=> Command: chmod
The chmod command modifies file permissions. For example, chmod 700 file.txt grants all permissions (read, write, execute) to the owner while removing permissions for others.
💡 Use ls -l to check file permissions and ownership.
Task 3: Check the last 10 commands you have run (history).
\=> Command: history | tail -10
The history command displays the command history, and combining it with tail -10 shows the last 10 commands.
Task 4: Remove a directory and all its contents.
\=> Command: rm -r
The rm -r (recursive) command removes directories along with their contents. Be cautious when using this command!
Task 5: Create a fruits.txt file, add content (one fruit per line), and display the content.
\=> Commands:
Use
vim fruits.txtto create the file and add content.Press
iin Vim to insert content, and save the file withESC + :wq.
Alternatively, use echo or touch commands to create files quickly.
Task 6: Add content in devops.txt (one in each line) - Apple, Mango, Banana, Cherry, Kiwi, Orange, Guava. Then, append "Pineapple" to the end of the file.
\=> Command: echo "Pineapple" >> fruits.txt
The >> operator appends content to a file without overwriting existing data.
Task 7: Show the first three fruits from the file in reverse order.
\=> Commands:
Use
head -3 fruits.txtto get the first three lines.Pipe it with
tacto reverse the order:head -3 fruits.txt | tac.
Task 8: Show the bottom three fruits from the file, and then sort them alphabetically.
\=> Commands:
Use
tail -3 fruits.txtto get the last three lines.Pipe it with
sortfor alphabetical sorting:tail -3 fruits.txt | sort.orted we have piped it with sort command. sort command is used to sort the file in alpabatical order.
Task 9: Create another file Colors.txt, add content (one color per line), and display the content.
\=> Command: Use vim colors.txt or other file-creation methods (e.g., touch + echo).
Task 10: Add content in Colors.txt (one in each line) - Red, Pink, White, Black, Blue, Orange, Purple, Grey. Then, prepend "Yellow" to the beginning of the file.
\=> Command:
Use echo "Yellow" | cat - colors.txt > temp && mv temp colors.txt to add "Yellow" to the start of the file.
Task 11: Find and display the lines that are common between fruits.txt and Colors.txt.
\=>Command: comm -12 <(sort fruits.txt) <(sort colors.txt)
This command finds common lines between two files by suppressing unique columns from both files using comm.
Task 12: Count the number of lines, words, and characters in both fruits.txt and Colors.txt
\=> Command: wc fruits.txt colors.txt
The wc (word count) command outputs the number of lines, words, and characters for each file.
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