The File Extensions Database

.1 File Extension

  • Category: Misc Files
  • Format: Text

What is an .1 file?

.1 is Unix Section 1 Man Page

A 1 file is a manual page (or "man page") used by Man utility, a Unix program used to view user manuals. It contains level 1 user manuals stored in plain text and separated into several segments and delimited by standard markers.

Level 1 user manuals describe general commands for the Unix operating system. They are stored in files that contain the name of the command followed by the ".1" extension. For example, a manual for the command "cmd_example" would have the filename "cmd_example.1."

Since Unix man pages are stored in a plain text format, they can be created and edited with any text editor.

NOTE: Unix man page files are commonly compressed into .GZ files and have the ".gz.1" compound extension. Unix man pages also use the ".2" through ".8" extensions for other sections. For example, the ".2" extension is used for System Calls documentation.

Programs that open Unix Section 1 Man Page
GNU Emacs

How to solve problems with 1 files

  • Associate the 1 file extension with the correct application. On :
    Windows: Right click on any 1 file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.1 files". Mac: Right click (or Ctrl-click) the 1 file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .1 is Unix Section 1 Man Page. Because only the current version supports the latest 1 file format. Search, therefore, e.g. on the N/A manufacturer website after an available .1 is Unix Section 1 Man Page update.
  • To make sure that your 1 file is not corrupted or virus-infected, get the file again and scan it with antivirus software.