---
name: toc
### Table of Contents
[Overview](#overview)<br>
[The Shell versus the Commands](#shell_vs_commands)<br>
[A Bit about Shells](#about_shells)<br>
[Command Navigation](#command_navigation)<br>
[Command Editing](#command_editing)<br>
[Introduction to Commands](#command_intro)<br>
[Files and Directories](#file_system)<br>
[Special Directories: The Home Directory](#home_dir)<br>
[The Current Working Directory](#working_dir)<br>
[Working in Multiple Terminals](#many_shells)<br>
[Listing Directory Contents](#listing_dirs)<br>
[About File names](#filenames)<br>
[Relative Pathnames](#pathnames)<br>
[Navigating Directories](#navigating_dirs)<br>
[Types of Commands](#command_types)<br>
[Learning About Commands](#learning_commands)<br>
[Getting Help: The Manual Pages](#man_pages)<br>
[Searching Through Man Pages](#man_page_searching)<br>
[The Info System](#info)<br>
[Help for  Shell Builtins](#bash_help)<br>
[Categories of Commands](#command_categories)<br>
[More Commands](#misc_commands)<br>
---
### Table of Contents

[Command Syntax](#cmmd_syntax)<br>
[Simple Command Syntax](#cmmd_syntax2)<br>
[Complex Command Syntax](#cmmd_syntax3)<br>
[Miscellaneous Commands](#misc_commands)<br>
[Miscellaneous Commands](#misc_commands2)<br>
[The Power of I/O Redirection](#redirection_examples1)<br>
[More Examples of Redirection](#redirection_examples2)<br>
[More Examples of I/O Redirection](#redirection_examples3)<br>
[Streams, Files, and Redirection](#streams)<br>
[File Descriptors and Streams](#file_descriptors)<br>
[I/O Redirection](#io_redirection)<br>
[Input Redirection](#input_redirection)<br>
[Output Redirection](#output_redirection)<br>
[Error Redirection](#error_redirection)<br>
[Redirection Examples](#redirection_examples)<br>
[Appending](#appending)<br>
[Pipes](#pipes)<br>
[Viewing Files](#viewing_files)<br>
[`ls`](#ls)<br>
[`basename`](#basename)<br>
[`dirname`](#dirname)<br>
[`find`](#find)<br>
[finding by file name](#find_by_name)<br>
[finding by time stamp](#find_by_time)<br>
---
### Table of Contents

[finding by other properties](#find_misc)<br>
[finding by other properties](#find_misc2)<br>
[taking actions when files are found](#find_actions)<br>
[Filter Introduction](#filter_intro)<br>
[Filter Synopsis](#filter_synopsis)<br>
[`cat` and  `tac`](#cat_tac)<br>
[`head` and `tail`](#head_tail)<br>
[`sort`](#sorting)<br>
[`sort` Examples (1)](#sort_examples1)<br>
[`sort` Examples (2)](#sort_examples2)<br>
[`uniq`](#uniq)<br>
[Combining Filters](#combining_filters)<br>
[Filters: `grep`, `egrep`, and `fgrep`](#grep_family)<br>
[Regular Expression Rules](#regex1)<br>
[Regular Expression Rules (2)](#regex2)<br>
[Regular Expression Character Classes](#regex3)<br>
[Regular Expression Character Classes (2)](#regex4)<br>
[Regular Expressions: Anchors](#anchors)<br>
[Regular Expressions: Backreferences](#backreferences)<br>
[Filters: `sed`](#sed1)<br>
[`sed` Substitution Command](#sed2)<br>
[`sed` Address Specifiers](#sed3)<br>
[`sed` Address Specifiers](#sed4)<br>
[Filters: `sed`](#sed-scripts)<br>
---
### Table of Contents

[Using `sed` to display the URLS in an HTML file](#sed_big_example)<br>
[Using `sed` to display the URLS in an HTML file](#sed-example1)<br>
[Using `sed` to display the URLS in an HTML file](#sed-example2)<br>
[Filters: `cut` and `paste`](#cut_paste1)<br>
[Filters: `cut` and `paste` (2)](#cut_paste2)<br>
[Filters: `cut` and `paste` (3)](#cut_paste3)<br>
[`awk`](#awk1)<br>
[`awk` (2)](#awk2)<br>
[`awk` (3)](#awk3)<br>
[`awk` (4)](#awk4)<br>
[`awk` (5)](#awk5)<br>
[`awk` (6)](#awk6)<br>
[`awk` (7)](#awk7)<br>
[Filters yet to come:](#more_filters)<br>
[Useful Links](#links)<br>
[Exercises 1](#exercise1)<br>
[Exercises 2](#exercise2)<br>
[Exercises 3](#exercise3)<br>
[Exercises 4](#exercise4)<br>
[Exercises 5](#exercise5)<br>
[Exercises 6](#exercise6)<br>
[Exercises 7](#exercise7)<br>
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