@devkits/chmod-calculator

Calculate Unix file permissions between numeric (755) and symbolic (rwxr-xr-x) notation. Essential tool for developers working with Linux/Unix systems.

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Installation

npm install @devkits/chmod-calculator

Usage

const { fromNumeric, toSymbolic, parsePermissions, toCommand, PRESETS } = require('@devkits/chmod-calculator');

// Convert numeric to symbolic
fromNumeric('755');
// 'rwxr-xr-x'

fromNumeric('644');
// 'rw-r--r--'

// Convert symbolic to numeric
toSymbolic('rwxr-xr-x');
// '755'

// Get detailed permission breakdown
parsePermissions('755');
// {
//   numeric: '755',
//   symbolic: 'rwxr-xr-x',
//   owner: { value: 7, symbolic: 'rwx', read: true, write: true, execute: true },
//   group: { value: 5, symbolic: 'r-x', read: true, write: false, execute: true },
//   other: { value: 5, symbolic: 'r-x', read: true, write: false, execute: true }
// }

// Generate chmod command
toCommand('755', 'myscript.sh');
// 'chmod 755 myscript.sh'

// Access common presets
console.log(PRESETS['755']);
// 'Owner full, others read+execute (rwxr-xr-x)'

API

fromNumeric(numeric)

Converts numeric chmod (e.g., '755') to symbolic notation (e.g., 'rwxr-xr-x').

toSymbolic(symbolic)

Converts symbolic notation to numeric chmod.

numericToSymbolic(num)

Converts a single permission digit (0-7) to symbolic (e.g., 5 → 'r-x').

symbolicToNumeric(symbolic)

Converts a single symbolic triplet to numeric (e.g., 'r-x' → 5).

toCommand(numeric, filename)

Generates a chmod command string.

parsePermissions(numeric)

Returns detailed breakdown of permissions for owner, group, and others.

PRESETS

Object containing common permission presets with descriptions.

Common Permission Presets

| Mode | Symbolic | Use Case | |------|----------|----------| | 777 | rwxrwxrwx | Everyone has full permissions (dangerous!) | | 755 | rwxr-xr-x | Executable scripts, directories | | 700 | rwx------ | Private directories | | 644 | rw-r--r-- | Regular files, web content | | 600 | rw------- | Private files, SSH keys | | 444 | r--r--r-- | Read-only files | | 400 | r-------- | Owner read-only |

See Also

🔧 More DevKits Tools

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License

MIT