diff --git a/share/completions/cp.fish b/share/completions/cp.fish
index 178c0408e..e81ec8a7f 100644
--- a/share/completions/cp.fish
+++ b/share/completions/cp.fish
@@ -1,4 +1,4 @@
-if cp --version 2>/dev/null > /dev/null # GNU
+if cp --version 2>/dev/null > /dev/null # GNU cp
 	complete -c cp -s a -l archive -d "Same as -dpR"
 	complete -c cp -s b -l backup -d "Make backup of each existing destination file" -a "none off numbered t existing nil simple never"
 	complete -c cp -l copy-contents -d "Copy contents of special files when recursive"
@@ -26,17 +26,51 @@ if cp --version 2>/dev/null > /dev/null # GNU
 	complete -c cp -s s -l symbolic-link -d "Make symbolic links instead of copying"
 	complete -c cp -s T -l no-target-directory -d "Treat DEST as a normal file"
 	complete -c cp -s x -l one-file-system -d "Stay on this file system"
-	complete -c cp -s X -l context -r -d "Set security context of copy to CONTEXT"
-else # OS X
-	complete -c cp -s a -d "Preserve structure and attributes of files but not directory structure. (-pPR)"
-	complete -c cp -s f -d "Replace destination file without confirmation"
-	complete -c cp -s H -d "Follow symlinks on command-link"
+	complete -c cp -s X -l context -r -d "Set SELinux context of copy to CONTEXT"
+else # BSD/macOS
+	set -l uname (uname -s)
+	# Solaris:   cp [-R | r [H | L | P ]] [-fi ] [-p        ]
+	# openbsd:   cp	[-R |   [H | L | P ]] [-fi ] [-pv       ]
+	# macos:     cp [-R |   [H | L | P ]] [-fin] [-pva   cX ] # -c: clone -X: copy xattrs
+	# netbsd:    cp [-R |   [H | L | P ]] [-fi ] [-pval    N] # -l: hard link instead of copy -N: don't copy file flags
+	# dragonfly: cp [-R |   [H | L | P ]] [-fin] [-pvalx    ] # -x: don't traverse mount points
+	# freebsd:   cp	[-R |   [H | L | P ]] [-fin] [-pvalxs   ] # -s: symlink instead of copy
+	if [ "$uname" = SunOS ] # annoying
+		complete -c cp -s r -d "Copy directories recursively"
+		complete -c cp -s R -d "Like -r, but replicating pipes instead of reading pipes"
+	else
+		complete -c cp -s R -d "Copy directories recursively"
+	end
+	complete -c cp -s H -d "with -R: Follow symlinks in cp arguments"
+	complete -c cp -s L -d "with -R: Follow all symlinks"
+	complete -c cp -s P -d "with -R: Don't follow symlinks (default)"
+
+	complete -c cp -s f -d "Replace destination without confirmation"
 	complete -c cp -s i -d "Prompt before overwrite"
-	complete -c cp -s L -d "Follow all symlinks"
-	complete -c cp -s n -d "Do overwrite existing files"
-	complete -c cp -s P -d "Don't follow symlinks (default)"
+	not contains "$uname" SunOS OpenBSD NetBSD
+		and complete -c cp -s n -d "Don't overwrite existing files"
+
 	complete -c cp -s p -d "Preserve attributes of source file"
-	complete -c cp -s R -d "Copy directories recursively"
-	complete -c cp -s v -d "Verbos output"
-	complete -c cp -s X -d "Do not copy Extended Attributes (EAs) of resource forks"
-end
\ No newline at end of file
+	if [ "$uname" = SunOS ]
+		exit 0
+	end
+	complete -c cp -s v -d "Print file names as files are copied"
+	if [ "$uname" = OpenBSD ]
+		exit 0
+	end
+	complete -c cp -s a -d "Archive mode (-pPR)"
+	if [ "$uname" = Darwin ]
+		complete -c cp -s c -d "Clone using clonefile(2)"
+		complete -c cp -s X -d "Do not copy xattrs or resource forks"
+		exit 0
+	end
+	complete -c cp -s l -d "Hard link instead of copying"
+	if [ "$uname" = NetBSD ]
+		complete -c cp -s N -d "Don't copy file flags"
+		exit 0
+	end
+	complete -c cp -s x -d "Don't traverse file system mount points"
+	if [ "$uname" = FreeBSD ]
+		complete -c cp -s s -d "Symlink instead of copying"
+	end
+end