Download e-book for kindle: Bash Pocket Reference: Help for Power Users and Sys Admins by Arnold Robbins

By Arnold Robbins

ISBN-10: 1491941545

ISBN-13: 9781491941546

It s basic: with a purpose to engage deeply with Mac OS X, Linux, and different Unix-like structures, you want to understand how to paintings with the Bash shell. This concise little publication places the entire crucial information regarding Bash correct at your fingertips.

You ll quick locate solutions to the irritating questions that as a rule arise if you re writing shell scripts: What characters do you want to cite? How do you get variable substitution to do just what you will want? How do you utilize arrays?

Updated for Bash model 4.4, this ebook has the solutions to those and different difficulties in a structure that makes shopping speedy and easy.

Topics contain:
• Invoking the shell
• Syntax
• features and variables
• mathematics expressions
• Command history
• Programmable completion
• activity control
• Shell options
• Command execution
• Coprocesses
• constrained shells
• integrated commands"

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Extra info for Bash Pocket Reference: Help for Power Users and Sys Admins (2nd Edition)

Example text

That may sound like a neat feature, but it drives professionals nutty. AGC, in essence, strives to record all sound at exactly the same level. When something is very loud, the AGC circuit quiets it down to middle volume; when something is very soft, the AGC circuit boosts it to middle volume. Over the years, automatic-gain circuitry has dramatically improved. The electronic boosting or quieting is smoother and less noticeable than it once was. Even some modern camcorders, however, sometimes exhibit the unpleasant side effects of AGC circuitry: Try filming something that's very quiet, and then suddenly clap right next to the microphone.

2. Wireless Mikes One of those inexpensive tie-clip microphones is ideal when you're filming interviews, speeches, or scripted dialog with actors. But in other situations, a cabled microphone like this is impractical, such as when you're shooting a jogger, somebody in a car, or an undercover agent. Figure 2-2. A tie-clip microphone, known in the business as a Lavalier mike ("lava-LEER"), is a very inexpensive way to dramatically improve the audio on your footage, especially when accompanied by an extension cable or two.

Wireless Mikes One of those inexpensive tie-clip microphones is ideal when you're filming interviews, speeches, or scripted dialog with actors. But in other situations, a cabled microphone like this is impractical, such as when you're shooting a jogger, somebody in a car, or an undercover agent. Figure 2-2. A tie-clip microphone, known in the business as a Lavalier mike ("lava-LEER"), is a very inexpensive way to dramatically improve the audio on your footage, especially when accompanied by an extension cable or two.

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Bash Pocket Reference: Help for Power Users and Sys Admins (2nd Edition) by Arnold Robbins


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