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From: "J.O. Aho" <user@example.net>
Newsgroups: alt.os.linux
Subject: Re: patch a file with the patch command
Date: Mon, 5 Aug 2024 23:05:24 +0200
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On 05/08/2024 17.33, alex wrote:
>  > patch -p1 < ../from_org_to_revised.patch
> 
> The parameter -p1 what is it for?
> 

it's to remove the first level of directory as in my example the paths 
had been

--- orgcopy/orig    2024-08-02 14:22:59.937683379 +0200
+++ revisedcopy/orig    2024-08-02 10:17:25.108469758 +0200

so -p1 would make it same as:
--- orig    2024-08-02 14:22:59.937683379 +0200
+++ orig    2024-08-02 10:17:25.108469758 +0200

Say you had had:

--- src1/dir/orig    2024-08-02 14:22:59.937683379 +0200
+++ src2/dir/orig    2024-08-02 10:17:25.108469758 +0200

and you are in the src1/dir applying the patch, you would like to remove 
two levels and use -p2, but if you had been in src1 then you would just 
use -p1.

I hope that was understandable...

-- 
  //Aho