? nl
? sysctl.d
Index: sysctl.8
===================================================================
RCS file: /cvs/src/sbin/sysctl/sysctl.8,v
retrieving revision 1.213
diff -u -p -r1.213 sysctl.8
--- sysctl.8	12 Jan 2018 04:36:44 -0000	1.213
+++ sysctl.8	11 Feb 2018 00:52:26 -0000
@@ -45,6 +45,9 @@
 .Nm sysctl
 .Op Fl nq
 .Ar name Ns = Ns Ar value ...
+.Nm sysctl
+.Op Fl nq
+.Fl f Ar file
 .Sh DESCRIPTION
 The
 .Nm
@@ -76,6 +79,15 @@ flag; for the table values, the name of 
 List all the currently available string or integer values.
 This is the default, if no parameters are given to
 .Nm .
+.It Fl f Ar file
+Read
+.Ar name
+variables to output, or
+.Ar name Ns = Ns Ar value
+assignments from lines of a file.
+If
+.Ar file
+is specified as - lines will be read from standard input.
 .It Fl n
 Suppress printing of the field name, only output the field value.
 Useful for setting shell variables.
Index: sysctl.c
===================================================================
RCS file: /cvs/src/sbin/sysctl/sysctl.c,v
retrieving revision 1.229
diff -u -p -r1.229 sysctl.c
--- sysctl.c	10 Feb 2018 05:53:58 -0000	1.229
+++ sysctl.c	11 Feb 2018 00:52:26 -0000
@@ -184,6 +184,7 @@ void debuginit(void);
 void listall(char *, struct list *);
 int parse_hex_char(char);
 ssize_t parse_hex_string(unsigned char *, size_t, const char *);
+int parsefile(const char *);
 void parse(char *, int);
 void parse_baddynamic(int *, size_t, char *, void **, size_t *, int, int);
 void usage(void);
@@ -220,8 +221,9 @@ int
 main(int argc, char *argv[])
 {
 	int ch, lvl1;
+	int fflag;
 
-	while ((ch = getopt(argc, argv, "Aanqw")) != -1) {
+	while ((ch = getopt(argc, argv, "Aafnqw")) != -1) {
 		switch (ch) {
 
 		case 'A':
@@ -232,6 +234,10 @@ main(int argc, char *argv[])
 			aflag = 1;
 			break;
 
+		case 'f':
+			fflag = 1;
+			break;
+
 		case 'n':
 			nflag = 1;
 			break;
@@ -251,6 +257,13 @@ main(int argc, char *argv[])
 	argc -= optind;
 	argv += optind;
 
+	if (fflag) {
+		if (argc != 1)
+			usage();
+
+		return (parsefile(argv[0]));
+	}
+
 	if (argc == 0 || (Aflag || aflag)) {
 		debuginit();
 		vfsinit();
@@ -335,6 +348,42 @@ parse_hex_string(unsigned char *dst, siz
 	return (len);
 }
 
+int
+parsefile(const char *file)
+{
+	FILE *f;
+	char *line = NULL;
+	size_t linesize = 0;
+	ssize_t linelen;
+
+	if (strcmp(file, "-") == 0)
+		f = stdin;
+	else {
+		f = fopen(file, "r");
+		if (f == NULL)
+			err(1, "open %s", file);
+	}
+
+	while ((linelen = getline(&line, &linesize, f)) != -1) {
+		char *c;
+
+		c = strchr(line, '#');
+		if (c != NULL)
+			*c = '\0';
+		
+		if (strlen(line) == 0)
+			continue;
+
+		line[linelen - 1] = '\0';
+		parse(line, 1);
+	}
+	if (ferror(f))
+		err(1, "read %s", file);
+
+	/* all done */
+	return (0);
+}
+
 /*
  * Parse a name into a MIB entry.
  * Lookup and print out the MIB entry if it exists.
@@ -2725,6 +2774,7 @@ usage(void)
 	(void)fprintf(stderr,
 	    "usage: sysctl [-Aan]\n"
 	    "       sysctl [-n] name ...\n"
-	    "       sysctl [-nq] name=value ...\n");
+	    "       sysctl [-nq] name=value ...\n"
+	    "       sysctl [-nq] -f file\n");
 	exit(1);
 }