Join Kevin Skoglund for an in-depth discussion in this video Configuring history with variables, part of Unix for Mac OS X Users.
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- Exercise Files
Environment variables can be very helpful in allowing us to customize how…the Unix history works.…There are five different variables that we can configure.…Before we start looking at them, let's first start by just using history -c to…clear out our existing history so that everything we work with we'll be able to…easily identify what's new and what's been added to the history, and then let's…do nano .bashrc and right below where we set our path I am just going to paste…in the lines for the history and then we can talk to them and that way you don't…have to sit and watch me type.…
So notice that on each of them I'm exporting it and here is the variable name.…HISTSIZE, HIST being short for history, HISTSIZE= and then a number.…This is the number of commands that history will remember.…By default it will remember 500.…If you want more or less, well this is how you change it. You set the variable here.…Once we get to that maximum number then the oldest command will drop off the top…and it will still just add the newest command at the bottom.…
- Moving around the file system
- Creating and reading files
- Copying, moving, renaming, and deleting files and directories
- Creating hard links and symbolic links
- Understanding user identity, file ownership, and sudo
- Setting file permissions with alpha and octal notation
- Changing the PATH variable
- Using the command history
- Directing input and output
- Configuring the Unix working environment
- Searching and replacing using grep and regular expressions
- Manipulating text with tr, sed, and cut
- Integrating with the Finder, Spotlight, and AppleScript
Skill Level Beginner
1. Introduction to Unix
2. Filesystem Basics
3. Working with Files and Directories
4. Ownership and Permissions
5. Commands and Programs
6. Directing Input and Output
7. Configuring Your Working Environment
8. Unix Power Tools
9. Useful Mac-Only Commands and Techniques
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