Join Kevin Skoglund for an in-depth discussion in this video tr: Deleting and squeezing characters, part of Unix for Mac OS X Users.
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- Exercise Files
In the previous movie we saw how to use tr by looking at its standard translate usage.…The tr has several options that we can specify that will allow us to work…with it in other ways.…Instead of translating, it can also allow you to delete or filter out characters…into dedupe repeating characters, a process that it refers to as squeezing.…The three options we are going to be looking out are the -d, -s and -c options.…-d will delete characters in the set that we specify.…So it'd just simply remove them. Instead of translating them that will just get removed.…The -s option will squeeze repeats that are in the listed set.…
So it won't necessarily squeeze everything, but the things that we've told it to, …it will compress down.…If we had for example five Xs in a row, it would turn it into one X instead, and…then the -c option says Use the complementary set. It's the opposite.…So you would use this option either with either the -d or the -s option.…With the -d option I mean delete characters that are not in the listed set, right.…
- 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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