How do I install the X Lsof skill?

Run npx skillmds@latest add x-cmd/x-lsof in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is X Lsof safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with X Lsof?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is X Lsof free to use?

Yes. Installing skills from SkillMD is free. This skill is licensed under Apache-2.

Who published X Lsof?

x-cmd (@x-cmd) published this skill. Their other Agent Skills are listed on their SkillMD profile.

X Lsof by x-cmd — Agent Skill

Name: X Lsof
Author: x-cmd

X Lsof

Enhanced lsof (List Open Files) with interactive UI and structured output. View open files, network connections, and processes. **Dependency**: This is an x-cmd module. Install x-cmd first (see x-cmd skill for installation options). see x-cmd skill for installation.

x-cmd 1ecf746 10 files · 12.0 KB Updated Sep 17, 2026

File contents

x lsof - List Open Files

Enhanced lsof with interactive UI, fzf search, and TSV/CSV/JSON output formats.

Quick Start

# Interactive view (default in TTY)
x lsof

# fzf interactive search
x lsof fz

# TSV format output
x lsof --tsv

Features

Auto-download: If lsof is not available, x-cmd automatically downloads a portable version from trusted sources
Interactive UI: TUI application for viewing open files
fzf Integration: Interactive search with fzf
Multiple Formats: TSV, CSV, and raw output for data processing
Port-to-PID: Find process ID by port number

Commands

Command	Description
`x lsof`	Interactive TUI view (default in TTY) / TSV (piped)
`x lsof fz`	Interactive fzf search
`x lsof --app`	TUI application view
`x lsof --tsv`	TSV format output
`x lsof --csv`	CSV format output
`x lsof --raw`	Raw format output
`x lsof --pidofport <port>`	Find PID by port number

Examples

Basic Usage

# Interactive view (TTY default)
x lsof

# fzf interactive mode
x lsof fz

# TSV format for processing
x lsof --tsv

# CSV format
x lsof --csv

Find Process by Port

# Find PID listening on port 8080
x lsof --pidofport 8080

# Find all processes using port 443
x lsof -i:443

Data Processing

# Filter with awk
x lsof --tsv | awk -F'\t' '$2 == "TCP"'

# Import to spreadsheet
x lsof --csv > open_files.csv

# Count files by process
x lsof --tsv | cut -f1 | sort | uniq -c | sort -rn

Output Fields

Field	Description
COMMAND	Process name
PID	Process ID
USER	User name
FD	File descriptor
TYPE	File type (REG, DIR, IPv4, IPv6)
DEVICE	Device number
SIZE/OFF	File size or offset
NODE	Inode number
NAME	File name / network connection

Automatic Binary Download

If lsof is not installed on your system, x-cmd automatically downloads a portable version from trusted sources (pixi/conda-forge) and manages it locally. No manual installation required.

Supported platforms:

Linux (x86_64, aarch64)
macOS (x86_64, arm64)
Windows (limited support)

Platform Notes

Linux/macOS: Full support with native or auto-downloaded lsof
Windows: Limited support, may require WSL

Native lsof(8) manual page

---name: x-lsofdescription: Enhanced lsof (List Open Files) with interactive UI and structured output. View open files, network connections, and processes. **Dependency**: This is an x-cmd module. Install x-cmd first (see x-cmd skill for installation options). see x-cmd skill for installation.license: Apache-2.0---# x lsof - List Open Files> Enhanced `lsof` with interactive UI, fzf search, and TSV/CSV/JSON output formats.---## Quick Start```bash# Interactive view (default in TTY)x lsof# fzf interactive searchx lsof fz# TSV format outputx lsof --tsv```---## Features- **Auto-download**: If `lsof` is not available, x-cmd automatically downloads a portable version from trusted sources- **Interactive UI**: TUI application for viewing open files- **fzf Integration**: Interactive search with fzf- **Multiple Formats**: TSV, CSV, and raw output for data processing- **Port-to-PID**: Find process ID by port number---## Commands| Command | Description ||---------|-------------|| `x lsof` | Interactive TUI view (default in TTY) / TSV (piped) || `x lsof fz` | Interactive fzf search || `x lsof --app` | TUI application view || `x lsof --tsv` | TSV format output || `x lsof --csv` | CSV format output || `x lsof --raw` | Raw format output || `x lsof --pidofport <port>` | Find PID by port number |---## Examples### Basic Usage```bash# Interactive view (TTY default)x lsof# fzf interactive modex lsof fz# TSV format for processingx lsof --tsv# CSV formatx lsof --csv```### Find Process by Port```bash# Find PID listening on port 8080x lsof --pidofport 8080# Find all processes using port 443x lsof -i:443```### Data Processing```bash# Filter with awkx lsof --tsv | awk -F'\t' '$2 == "TCP"'# Import to spreadsheetx lsof --csv > open_files.csv# Count files by processx lsof --tsv | cut -f1 | sort | uniq -c | sort -rn```---## Output Fields| Field | Description ||-------|-------------|| COMMAND | Process name || PID | Process ID || USER | User name || FD | File descriptor || TYPE | File type (REG, DIR, IPv4, IPv6) || DEVICE | Device number || SIZE/OFF | File size or offset || NODE | Inode number || NAME | File name / network connection |---## Automatic Binary DownloadIf `lsof` is not installed on your system, x-cmd automatically downloads a portable version from trusted sources (pixi/conda-forge) and manages it locally. No manual installation required.Supported platforms:- Linux (x86_64, aarch64)- macOS (x86_64, arm64)- Windows (limited support)---## Platform Notes- **Linux/macOS**: Full support with native or auto-downloaded lsof- **Windows**: Limited support, may require WSL---## Related- Native `lsof(8)` manual page

Frequently asked questions