Text Processing

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

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