Mac app that shows all open files and sockets in use by all running applications. Nice GUI for lsof.
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README.md

Sloth

Sloth is a Mac application that displays all open files and sockets in use by all running applications on your system. This makes it easy to inspect which apps are using which files and sockets.

  • View all open files, directories, IP sockets, devices, unix sockets and pipes
  • View IP socket status, protocol and version
  • Filter by access mode, volume, type, location, or using regular expressions
  • Sort by name, process id, user etc.
  • Inspection window with detailed macOS and Unix file/socket info
  • Powerful contextual menu for file operations
  • Authenticate to run with root privileges

Sloth is essentially a graphical user interface built on top of the powerful lsof command line tool. The output of lsof is parsed and shown in a searchable, filterable outline view with all sorts of additional user-friendly functionality. Check out the screenshots below.

Sloth is free, open source software and has been maintained for a long time. If you find this program useful, please make a donation.

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Screenshots

Version history

09/08/2018 - Version 2.6

  • New and improved contextual menu
  • Fixed quirks with macOS Mojave's "Dark Mode"
  • Various user interface improvements

02/06/2018 - Version 2.5

  • Fixed critical lsof output parsing bug introduced in 2.4
  • New "Authenticate on launch" option in Preferences
  • Various minor interface refinements

10/05/2018 - Version 2.4

  • Now defaults to showing Mac-friendly process names (e.g. "Safari Web Content" instead of "com.apple.WebKit.WebContent").
  • Unix process names no longer truncated to 32 characters.
  • Search filter can now be used to filter by IP protocol (e.g. TCP or UDP) or IP version (e.g. IPv4 or IPv6)
  • Now shows TCP socket state (e.g. LISTEN, ESTABLISHED) in list and Info Panel
  • Info Panel now shows file descriptor integer
  • Info Panel now shows additional info for character devices
  • Info Panel now shows Carbon Process Serial Number (PSN) for processes, if available
  • Much improved IPv6 socket handling
  • DNS to IP and port name resolution in Info Panel when DNS/port lookup enabled in Prefs
  • Minor user interface enhancements

16/04/2018 - Version 2.3

  • Now supports access mode filtering (e.g. read, write, read/write)
  • Search filter now also filters by PID
  • DNS and port name lookup for IP Sockets in Info Panel
  • Info Panel now identifies standard I/O stream character devices
  • New Search Filter menu with case sensitivity and regex options
  • New application icon
  • Fixed bug where Volumes filter wouldn't work
  • Minor interface improvements

07/03/2018 - Version 2.2

  • Now defaults to excluding process binaries, shared libraries and current working directories in listing
  • DNS and port name lookup now disabled by default for faster execution (can be enabled in Preferences)
  • Info Panel now displays file access mode and process owner
  • New sort option: User ID
  • Info Panel now shows IP socket protocol and version
  • New Preferences window
  • New high-resolution pipe and socket icons
  • Fixed bug where sort settings were not respected on launch

12/02/2018 - Version 2.1

  • Copying a file path now creates a file representation in clipboard in addition to text
  • File paths are now red in colour if selected file does not exist at path
  • Uniform Type Identifier is now used to identify app bundles instead of .app suffix
  • Fixed issue with Info Window's handling of moved or non-existent files
  • Minor interface refinements

01/10/2017 - Version 2.0

  • New Volumes filter
  • New "Sort By" submenu under View in main menu
  • Sorting by PID now correctly does numerical sort instead of alphabetic

07/06/2017- Version 1.9

  • Files can now be dragged and dropped
  • Cmd-F now focuses on filter field
  • File representations can now be copied to the clipboard
  • Cmd-double-click now reveals file in Finder
  • Fixed various minor user interface bugs
  • Fixed collapse all bug with Get Info window open
  • New compact interface size option
  • Fixed broken permissions display for non-bundle processes in Info window

03/05/2017 - Version 1.8

  • Sloth is now code-signed
  • QuickLook now works from Get Info panel
  • Minor user interface improvements

17/06/2016 - Version 1.7

  • New Info Panel for items
  • Minor UI changes

24/02/2016 - Version 1.6

  • Asynchronous refresh
  • Much improved performance
  • UI improvements
  • New filtering options
  • Smarter regex filtering
  • Load results as root without restart
  • Expanded sorting options
  • Migrated project to ARC, modern Objective-C and Xcode 7
  • Substantial rewrite
  • Now requires OS X 10.8 or later

08/07/2010 - Version 1.5

  • Column sorting, column rearrangement
  • Several bug fixes
  • Copy/drag and drop selected items

29/05/2009 - Version 1.4

  • Regular expressions in search filter
  • New "Relaunch as root" option
  • Fixed bug in Mac OS X 10.5
  • Now built for Mac OS X 10.4 or later

28/07/2006 - Version 1.3.1

  • Released as a Universal Binary

05/03/2004 - Version 1.3

  • Live update for search filter
  • Sorting by column now works
  • Performance improvements
  • Lots of code replaced by Cocoa bindings thanks to Bill Bumgarner

27/02/2004 - Version 1.2

  • Filter search field now tries to match all fields when filtering
  • Added auto-refresh timer option
  • lsof binary and kill signal type can now be set in Preferences
  • New application icon
  • Added Icelandic and Japanese localizations

22/02/2004 - Version 1.1

  • Added search field filter.
  • New Action menu with menu items and shortcuts for button actions

21/02/2004 - Version 1.0

BSD License

Copyright (C) 2004-2018 Sveinbjorn Thordarson <sveinbjorn@sveinbjorn.org>

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

  3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The Sloth icon is Copyright (C) Drífa Thoroddsen 2018.