> Built-in text processing commands in the Jitzu shell.

# Text Processing

<table>
  <thead>
    <tr>
      <th>Command</th>
      <th>Description</th>
    </tr>
  </thead>
  <tbody>
    <tr><td><code>cat file</code></td><td>Display file with line numbers</td></tr>
    <tr><td><code>head [-n N] file</code></td><td>Show first N lines (default 10)</td></tr>
    <tr><td><code>tail [-n N] file</code></td><td>Show last N lines (default 10)</td></tr>
    <tr><td><code>grep [flags] pattern [files]</code></td><td>Search files for pattern</td></tr>
    <tr><td><code>sort [-r/-n/-u] file</code></td><td>Sort lines</td></tr>
    <tr><td><code>uniq [-c/-d] file</code></td><td>Remove consecutive duplicate lines</td></tr>
    <tr><td><code>wc [-l/-w/-c] file</code></td><td>Count lines, words, or characters</td></tr>
    <tr><td><code>diff file1 file2</code></td><td>Compare two files</td></tr>
    <tr><td><code>tr [-d] s1 s2 file</code></td><td>Translate or delete characters</td></tr>
    <tr><td><code>cut -d/-f/-c file</code></td><td>Extract fields or characters</td></tr>
    <tr><td><code>rev file</code></td><td>Reverse characters in each line</td></tr>
    <tr><td><code>tac file</code></td><td>Print file with lines in reverse order</td></tr>
    <tr><td><code>paste [-d] file file</code></td><td>Merge lines from multiple files</td></tr>
    <tr><td><code>view file</code></td><td>View file in pager with markdown rendering</td></tr>
    <tr><td><code>more/less</code></td><td>Paginated output viewer</td></tr>
  </tbody>
</table>

## view

Open a file in the interactive pager. Markdown files (`.md`, `.markdown`) are rendered with ANSI formatting — headers, bold, italic, inline code, code blocks, tables, lists, blockquotes, links, and horizontal rules all render with colors and box-drawing characters.

Non-markdown files are displayed as plain text.

```shell
> view README.md
┌──────────┬────────┬───────┐
│ Name     │ Type   │ Size  │
├──────────┼────────┼───────┤
│ Parser   │ Core   │ 2.4K  │
│ Lexer    │ Core   │ 1.8K  │
└──────────┴────────┴───────┘
```

Navigation is the same as `more`/`less` — arrow keys, `j`/`k`, Page Up/Down, `/` to search, `q` to quit. The pager uses the alternate screen buffer so your scrollback history is preserved.

### Supported Markdown

| Element | Syntax |
|---------|--------|
| Headers | `#`, `##`, `###` — bold with distinct colors |
| Bold | `**text**` |
| Italic | `*text*` |
| Inline code | `` `code` `` |
| Code blocks | Fenced with ` ``` ` |
| Tables | Pipe-delimited with box-drawing borders |
| Bullet lists | `- item` rendered with `•` |
| Numbered lists | `1. item` |
| Blockquotes | `> text` with `│` bar |
| Links | `[text](url)` — text underlined, URL dimmed |
| Horizontal rules | `---` rendered as `─` line |

## grep

Search for patterns in files with highlighted matches. Supports recursive search, case-insensitive matching, line numbers, and match counting.

```shell
> grep -rn "TODO" src/
src/Parser.cs:42:    // TODO: Handle forward references
src/Interpreter.cs:156:    // TODO: Optimize stack layout

> grep -ic "error" logs/
logs/app.log:15
logs/server.log:3
```

Flags: `-i` case insensitive, `-n` line numbers, `-r` recursive, `-c` count only.

## sort

```shell
> sort -r names.txt
Zara
Mike
Alice
```