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Introduction to Linux Server Operating Systems

• 30min

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Linux Server Installation and Lab Setup

• 23min

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Working with the Linux Command Line Interface

• 1hr 30min

0 / 12 lessons complete

User and Group Management

• 44min

0 / 7 lessons complete

Linux Storage

• 30min

0 / 6 lessons complete

System Administration Basics

• 48min

0 / 7 lessons complete

Linux Networking

• 47min

0 / 8 lessons complete

Course Conclusion

• 5min

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Viewing Files


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Reading File Contents

cat (Concatenate and Display)

The cat command is used to display the contents of a file. It can be used to view the entire content of a file at once.

cat filename.txt

more and less (Pager Commands)

more and less are pager commands that allow you to view large files one screen at a time. They provide navigation options for reading through files.

more filename.txt
less filename.txt

head and tail (View Start/End of Files)

head and tail are used to view the beginning and end of files, respectively. They are often used to display a portion of a file.

head -n 10 filename.txt  # Display the first 10 lines
tail -n 20 filename.txt  # Display the last 20 lines

Adding the -f option will cause the tail command continuously displays the latest content of a file in real-time. It's particularly useful for monitoring log files as they receive new entries.

tail -f /var/log/syslog

Press Ctrl + C to exit the command.

grep (Search Text in Files)

The grep command is used to search for specific text patterns in files. It is a powerful tool for text-based searching.

grep "pattern" filename.txt

Below is an example of searching the syslog file in /var/log for all events that happened at 14:17:

grep "14:17:" /var/log/syslog

In this lesson, you learned how to manipulate files on a Linux/Unix system, covering essential commands for creating, reading, and modifying files. We covered a lot of commands so this is a short recap of what we covered:

  1. cat: Display file contents.
  2. more and less: View large files with navigation.
  3. head and tail: View the start and end of files.
  4. grep: Search for patterns in a file or output

Great job getting through this lecture..I'll see you in the next one!

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