Jason Cannon - Command Line Kung Fu: Bash Scripting Tricks, Linux Shell Programming Tips, and Bash One-liners
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- Book:Command Line Kung Fu: Bash Scripting Tricks, Linux Shell Programming Tips, and Bash One-liners
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Command Line Kung Fu: Bash Scripting Tricks, Linux Shell Programming Tips, and Bash One-liners: summary, description and annotation
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- How to quickly and easily repeat commands in your shell history
- Shortcuts for grabbing specific words from your shell history to use in your current command
- How to save a copy of your command line session for later reference
- How to strip out blank lines and comments from files
- How to control colorized text when uses pipes and pagers
- Ways to transform text: from changing case to substituting characters and more
- How to extract specific blocks of text from files or streams of input
- A quick tip to fix common typos
- How to edit files over the network
- How to compare the differences between files on your local computer and a remote one
- How to create and use SSH tunnels
- Ways to verify what programs are listening on what ports
- How to kill all the processes for a given user with a single command
- Strategies for dealing with multi-hop SSH connections
- How to disconnect from a server in a way that will allow you to pick up where you left off
- How to automate software installs that require user input
- Shell scripting tips
- How to automatically keep repeating a command until it succeeds
- The right way to delete a file that is being written to
- How to surf the web from the command line... and more importantly how to download anything from the web and interact with HTTP APIs
- Ways to determine who and what is using the most disk space
- How to secure your web browser session when using an open wifi hotspot
- How to generate random passwords from the command line
- Two tips for easily creating backups
- Tips for handling tar archives
- How to replace a string in multiple files at once with just one command
- and much more...
Jason Cannon: author's other books
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As a thank you for reading Command Line Kung Fu, I would like to give you a copy of Linux Alternatives to Windows Applications. In it, you will be introduced to over 50 of the most popular applications available for Linux today. These applications will allow you to browse the web, watch movies, listen to music, connect to your favorite social networks, create presentations, and more. This gift is a perfect complement to this book and will help you along your Linux journey. Visit http://www.linuxtrainingacademy.com/linux-apps or click here to download your free gift.
I have been working at the command line on Unix and Linux systems since the 1990's. Needless to say, I feel right at home with nothing more than a dollar sign and a flashing cursor staring at me. Over the years I've picked up several command line "tricks" that have saved me time and frustration.
Some of these tips were born out of necessity I simply had too much work to complete and too little time to do it in. Others were modeled after popular patterns found in computer programming and application development. The rest were shared with me, either directly or indirectly, by my command line heroes and mentors. It's amazing what you can learn by watching, emulating, and taking advice from a seasoned Unix and Linux professional.
Even though the title is Command Line Kung Fu, you don't have to be a Linux ninja to use the tactics presented in this book. The tips work as presented. You can start putting them to use immediately without fully understanding all the details and nuances. However, if you want or need more information, explanations and practical real-world examples follow each one.
Also, if you want an overview of the Linux command line and operating system please read my other book Linux for Beginners. It will give you a strong foundation upon which you can build your Linux skills.
Let's get started.
If you ever forget to run a command with root privileges, you can simply repeat it by using sudo !! or su -c "!!".
This exclamation mark syntax is called an event designator. An event designator references a command in your shell history. Bang-Bang (!!) repeats the most recent command, but one of my favorite uses of the event designator is to run the most recent command that starts with a given string. Heres an example.
This is another example of an event designator. To recall the most recent command that begins with , run "!". You can simply specify the first letter, or as much of the string to make it unique. This example demonstrates that concept.
Here is a practical example where you check to see if a process is running, kill it, and confirm that it did indeed stop.
If you need to grab the second word from the previous command, you can use the "!^" word designator. Wherever you use "!^" it will be replaced by the second word from the previous command. You can also think of this as the first argument to the previous command.
Quite often I find myself needing to perform another operation on the last item on the previous command line. To access that item in your current command, use "!$".
$ !!:N
$ :
To access a word in the previous command use "!!:N" where N is the number of the word you wish to retrieve. The first word is 0, the second word is 1, etc. You can think of 0 as being the command, 1 as being the first argument to the command, 2 as being the second argument, and so on.
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