Help for every Linux command is readily available at your fingertip just by utilizing a couple of basic tools: help, man, and info.
- [Instructor] Knowing how to get information about commands…in Linux is paramount to understanding…such a powerful operating system.…Let's start by using the built-in --help option.…Open a terminal by going to Applications,…Favorites, Terminal.…I'm going to make mine full screen, and bump the font size.…Type in ls, space, --help, and hit Enter.…The --help information is built into most Linux commands,…so it will always be available.…If the output is too long, use the scroll bar,…or press Shift, Page Up, to scroll up.…
At the top of the output of ls --help,…it shows the command syntax for usage.…- -help doesn't work for all commands.…For instance, cd, space, --help…results in an error message.…The reason for this is that cd…is built into the Bash shell,…so it doesn't exist as a SCParate command on the disk.…For those commands built into the Bash shell,…we can use the help command to get the syntax.…Type in help, space, cd, and hit Enter.…Between the --help option and the help command,…we should be able to get quick help on most any command.…
Author
Grant McWilliams
Released
8/31/2017Instructor Grant McWilliams covers network and internet services administration, kernel management, and intrusion prevention. He shows how to make your systems more efficient with virtualization, manage users and groups, and lock everything down with SELinux mandatory access control. Plus, get access to 25 PDF "cheat sheets" and 100 practice questions so you can solidify and test your knowledge.
- Installing Linux on a physical machine
- Managing systemd services
- Managing reoccurring jobs with cron
- Limiting system access
- Configuring networking
- Creating, editing, and moving files and directories
- Analyzing text with grep and regular expressions
- Installing software and packages
- Managing the kernel
- Managing users, accounts, and groups
- Setting permissions
- Using access control lists
- Securing Linux with SELinux
- Accessing Linux remotely
- Configuring local storage
Skill Level Intermediate
Duration
Views
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Introduction
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Welcome57s
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What you should know3m 45s
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About Red Hat Certifications2m 52s
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1. Deploy Systems
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Managing virtual machines6m 42s
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2. System Config and Services
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Get systemd service status3m 56s
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Manage systemd services2m 33s
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Configure networking3m 52s
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Manage one-time jobs with at4m 16s
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3. Essential Tools
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Archive files using tar4m 40s
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Compress files and archives4m 14s
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Create files and directories5m 18s
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Copy files and directories5m 48s
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Move files and directories4m 59s
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Create hard and soft links4m 55s
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Introduction to vim3m 33s
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Editing text with vim2m 45s
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Reading the system journal3m 26s
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4. Manage System Software
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Query with RPM7m 14s
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RPM query formatting6m 5s
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Overview of yum2m 20s
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Get info on package groups5m 15s
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Search for packages1m 47s
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Install and remove packages6m 59s
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Manage OS updates6m 48s
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Update the kernel4m 29s
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Manage kernel modules5m 18s
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5. Users and Accounts
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Modify local user accounts4m 57s
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6. File Access Control
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File and directory modes1m 19s
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Read access control lists3m 36s
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Set access control lists5m 49s
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Delete access control Lists4m 15s
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7. Manage Security
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Manage firewalls3m 15s
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8. Accessing Linux Remotely
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Configure Secure Shell2m 36s
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9. Configure Local Storage
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Conclusion
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Next steps1m 20s
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Video: Locate, read, and use system documentation