Linux CLI HowTo 3 🐧 How To ls file and less commands

3 – How-To: ls, file and less commands

How to List All Files in /var Directory

Steps:

1. Open terminal
2. Type ls /var and press Enter
3. Observe the output showing all files and directories in /var

Why: Shows system-wide files and directories that are typically not user-specific

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How to List Files in Both /var and Home Directory

Steps:

1. Open terminal
2. Type ls /var ~ and press Enter
3. Notice how it shows contents of both directories side by side

Why: Demonstrates how to view multiple directory contents simultaneously

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How to Show Detailed File Information in Home Directory

Steps:

1. Open terminal
2. Type ls ~ -l and press Enter
3. Examine the output showing permissions, ownership, size, and dates

Why: Provides comprehensive file information including access rights and metadata

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How to Show All Files Including Hidden Ones in Home Directory

Steps:

1. Open terminal
2. Type ls ~ -la and press Enter
3. Notice how hidden files (starting with dots) are now visible

Why: Reveals complete user directory contents including configuration files

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How to List Files by Modification Time in Home Directory

Steps:

1. Open terminal
2. Type ls ~ -lt and press Enter
3. Observe files sorted from newest to oldest

Why: Helps identify recently modified files for troubleshooting or tracking changes

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How to Get Help Information for ls Command

Steps:

1. Open terminal
2. Type ls --help and press Enter
3. Read the available options and usage information

Why: Provides quick reference for all ls command options without needing external documentation

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How to Check File Type of All Files in Current Directory

Steps:

1. Open terminal in target directory
2. Type file * and press Enter
3. Observe file type descriptions for each item

Why: Identifies whether files are text, binary, images, or other types without opening them

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How to Check File Type of Specific Directory

Steps:

1. Open terminal
2. Type file Downloads and press Enter
3. See the file type description for the Downloads directory

Why: Quickly determines if a directory is actually a file or directory

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How to Get Brief File Type Information

Steps:

1. Open terminal
2. Type file file -b and press Enter
3. Notice the concise output without full path information

Why: Provides clean, simple file type identification without verbose path details

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How to Check MIME Type of a File

Steps:

1. Open terminal
2. Type file filename -i and press Enter
3. View the MIME type (e.g., text/plain, image/jpeg)

Why: Useful for web development, file handling, or identifying file formats for applications

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How to Display Content of /etc/passwd File One Page at a Time

Steps:

1. Open terminal
2. Type less /etc/passwd and press Enter
3. Use arrow keys to scroll, PgUp/PgDn for pages, or ‘q’ to quit

Why: Allows safe viewing of large system files without overwhelming the terminal output

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How to Jump to Specific Line in a File Using less

Steps:

1. Open terminal
2. Type less /etc/passwd and press Enter
3. Type 25g then Enter to jump to line 25
4. Press ‘q’ to quit

Why: Quickly navigate to specific information within large text files without scrolling manually

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How to View File Contents with Line-by-Line Navigation

Steps:

1. Open terminal
2. Type less /etc/passwd and press Enter
3. Use Up/Down arrow keys to move one line at a time
4. Press ‘q’ to quit when done

Why: Allows precise navigation through file content for detailed examination

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How to View File Contents with Page-by-Page Navigation

Steps:

1. Open terminal
2. Type less /etc/passwd and press Enter
3. Use PgUp/PgDn keys to move one page at a time
4. Press ‘q’ to quit

Why: Efficient way to browse through large files without overwhelming screen display

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How to Navigate to Beginning and End of File

Steps:

1. Open terminal
2. Type less /etc/passwd and press Enter
3. Press Home key to go to beginning of file
4. Press End key to go to end of file
5. Press ‘q’ to quit

Why: Quick access to start and end of files for checking header/footer information

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