## 6. Finding Things
### a) How to select lines matching patterns in text files...
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+To find information within files, you use a command called `grep`.
| Example command | Description |
|-----------------|-------------|
-| `grep [options] day haiku.txt` | finds every instance of the string `day` in the file haiku.txt and pipes it to standard output |
-
-| grep options | |
+| `grep [options] day haiku.txt` | finds every instance of the string `day` in the file haiku.txt and pipes it to standard output | |
|--------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `-E` | tells grep you will be using a regular expression. Enclose the regular expression in quotes. _Note:_ the power of `grep` comes from using regular expressions. Please see the regular expressions sheet for examples |
| `-i` | makes matching case-insensitive |
| `-w` | outputs instances where the pattern is a whole word |
### b) How to find files with certain properties...
+To find file and directory names, you use a command called `find`
+
+
* **`find . -type d` -->
* **`-type [df]`** --> d lists directories; f lists files
* **`-maxdepth n`** --> `find` automatically searches subdirectories. If you don't want that, specify the number of levels below the working directory you would like to search
* **`-mindepth n`** --> starts `find`'s search n levels below the working directory
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-### c) How to use one command's output as arguments to another command...
-### d) How are text and binary files different?...