Install(1): Allow -c option with -d

Contributed by Gautam Tirumala

commands/install/install.c

@@ -428,7 +428,7 @@ void usage(void)
 Usage:\n\
   install [-lcpsz#] [-o owner] [-g group] [-m mode] [-S stack] [file1] file2\n\
   install [-lcpsz#] [-o owner] [-g group] [-m mode] [-S stack] file ... dir\n\
-  install -d [-o owner] [-g group] [-m mode] directory\n");
+  install [-c] -d [-o owner] [-g group] [-m mode] directory\n");
 	exit(1);
 }
 
@@ -600,7 +600,7 @@ int main(int argc, char **argv)
 		}
 	}
 	/* Some options don't mix. */
-	if (dflag && (cflag || lflag || strip)) usage();
+	if (dflag && (lflag || strip)) usage();
 
 	/* Don't let the user umask interfere. */
 	umask(000);

man/man1/install.1

@@ -33,7 +33,9 @@ install \- install files
 .IR file " ... " dir
 .br
 .ti -5
-.B install \-d
+.B install
+.RB [ \-c ]
+.B \-d
 .RB [ \-o
 .IR owner ]
 .RB [ \-g
@@ -89,7 +91,11 @@ Copy the source file to its proper place.  This option is the default if
 .B \-l
 is not given.  With
 .BR \-l ,
-the file is copied if the link fails.
+the file is copied if the link fails. This option is also allowed with
+.BR \-d .
+In this case the
+.BR \-c
+is ignored.
 .TP
 .B \-p
 Preserve timestamp on source file or directory.