Most Frequently Used linux – Part 2

This post  – Part 2 – provides practical examples for frequently used commands in Linux / UNIX systems.

This is not a comprehensive list by any means, but this should give you a jumpstart on some of the common Linux commands. Bookmark this article for your future reference.

The command list is:

  • ssh command

Login to remote host

# ssh -l ruben

Debug ssh client

# ssh -v -l ruben


  • pwd command

pwd command means Print Working Directory. This command print the current directory name.

  • who command

The who command prints information about all users who are currently logged in.

  • head command

head command, by default, prints the first 10 lines of each FILE to standard output. head also reads from standard input.

  • sed command

sed command, short for “stream editor”, allows you to filter and transform text. When you copy a DOS file to Unix, you could find \r\n in the end of each line.

This example converts the DOS file format to Unix file format using sed command.

# sed  ‘s/.$//’  your_file

Print file content in reverse order

# sed -n ‘1!G;h;$p’ your_file.txt

And that’s it.

Check Part 3 for more commands here.


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