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In this lesson, we explore essential Linux commands to create, delete, copy, and move files and directories. Understanding these commands is crucial for effective file management in Linux. Before using these commands, ensure you are familiar with these fundamental concepts:
  • What is a file system tree?
  • What is an absolute path?
  • What is a relative path?

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Listing Files and Directories

The ls command lists the files and directories in your current (or working) directory. The term ls is short for “list.” Here are several common usages:

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Basic Listing

Running the simple ls command in a typical home directory might display:
Files and directories starting with a dot (such as .ssh) are hidden by default. To view hidden files, include the -a option:

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Listing Files in a Specific Location

To list files from another directory, provide the path to the ls command:

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Long Listing Format

For extended details like permissions, ownership, and modification times, use the -l option:

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Combining Options for Detailed and Inclusive Listings

The -a and -l options can be combined, and their order is not important:
To display file sizes in a human-friendly format (bytes, kilobytes, megabytes, etc.), combine the -h option:

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Understanding the File System Tree

Linux organizes all files and directories into a hierarchical structure known as the file system tree. Think of it like an inverted tree, where the root directory (/) sits at the top, and all subdirectories branch out from there.

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Paths Explained

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Absolute Path

An absolute path starts from the root directory. For example:
This path begins at the root (/), moves through the home directory, then aaron, followed by Documents, and finally accesses the file Invoice.pdf.

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Relative Path

A relative path describes a location relative to the current working directory. To see your current working directory, use the pwd command:
If you’re logged in as user Aaron with the starting directory /home/aaron, the path Documents/Invoice.pdf would reference /home/aaron/Documents/Invoice.pdf. Likewise, Invoice.pdf without any directory designation refers to a file in the current directory, while ../Invoice.pdf navigates one level up. Consider this structure: the root directory (/) branches into several subdirectories and further levels until it eventually leads to files like “Invoice.pdf”.
The image shows a filesystem tree diagram with directories and a file path, illustrating the hierarchy from the root directory to a specific file named "Invoice.pdf".
  • Use cd /var/log to change to the /var/log directory using an absolute path.
  • Enter cd .. to move up one directory level (to the parent directory).
  • Simply type cd without arguments to return to your home directory.
  • Use cd - (or cd -- in some shells) to switch back to your previous directory.

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Creating Files and Directories

Creating files and directories in Linux is simple with the following commands:

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Creating Files

The touch command creates a new, empty file. For example, to create a file named Receipt.pdf in the current directory:
To create a file in another location, specify the file path. Both absolute and relative paths work:

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Creating Directories

Use the mkdir command (short for “make directory”) to create new directories. For instance:

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Copying Files and Directories

The cp command copies files and directories with ease.

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Copy a File

To copy a file, provide its source path and destination path:
It is advisable to end directory paths with a slash (/) to indicate that the destination is a directory. You can also copy a file and rename it simultaneously:

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Copy a Directory Recursively

To duplicate an entire directory and its contents, use the -r (recursive) flag:
Ensure the destination directory (e.g., BackupOfReceipts/) does not exist if you intend to create a new copy of the source directory.

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Moving and Renaming Files and Directories

The mv command is versatile—it moves files or folders and also renames them.

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Moving a File

To move a file to a different location:

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Renaming a File or Directory

To rename Receipt.pdf to old_receipt.pdf:
When moving directories, mv automatically processes all contained files and subdirectories without needing a recursive flag.

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Deleting Files and Directories

Deleting files and directories is straightforward with the rm command.

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Deleting Files

To remove a file:

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Deleting Directories Recursively

To delete a directory and all its contents, use the -r option:
Be cautious when using the rm -r command. Once executed, recovering a deleted directory and its contents can be difficult.
Visual aids, like command-line interfaces and directory structure diagrams, can help illustrate how paths reference files such as “Invoice.pdf”. However, the commands function independently of any visual representations.
The image shows a command-line interface on the left and a directory structure on the right, illustrating the path to a file named "Invoice.pdf" under the directories "/", "home", "aaron", and "Invoices".

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Summary

In this lesson, you learned how to:
  • List files and directories utilizing ls and its various options (-a, -l, -h).
  • Understand the differences between absolute and relative paths.
  • Create files with touch and directories with mkdir.
  • Copy files and directories using cp, including the recursive copy option for entire directories.
  • Move and rename files or directories with mv.
  • Delete files using rm and remove directories recursively with rm -r.
Happy learning and efficient file management in Linux!

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