More documentation updates, and minor fixes to make things sync

[oweals/busybox.git] / miscutils / makedevs.c

diff --git a/miscutils/makedevs.c b/miscutils/makedevs.c
index 5948bacc84ad177ba06650ada752c5cbb63804a1..c8206e020e5d3f8208b375402fe50ea32280fe07 100644 (file)
--- a/miscutils/makedevs.c
+++ b/miscutils/makedevs.c
@@ -17,10 +17,18 @@
 #include <sys/stat.h>
 
 static const char makedevs_usage[] =
-       "makedevs 0.01 -- Create an entire range of device files\n\n"
-       "\tmakedevs /dev/ttyS c 4 64 0 63        (ttyS0-ttyS63)\n"
-
-       "\tmakedevs /dev/hda b 3 0 0 8 s         (hda,hda1-hda8)\n";
+       "makedevs NAME TYPE MAJOR MINOR FIRST LAST [s]\n\n"
+       "Creates a range of block or character special files\n\n"
+       "TYPEs include:\n"
+       "\tb:\tMake a block (buffered) device.\n"
+       "\tc or u:\tMake a character (un-buffered) device.\n"
+       "\tp:\tMake a named pipe. MAJOR and MINOR are ignored for named pipes.\n\n"
+       "FIRST specifies the number appended to NAME to create the first device.\n"
+       "LAST specifies the number of the last item that should be created.\n"
+       "If 's' is the last argument, the base device is created as well.\n\n"
+       "For example:\n"
+       "\tmakedevs /dev/ttyS c 4 66 2 63   ->  ttyS2-ttyS63\n"
+       "\tmakedevs /dev/hda b 3 0 0 8 s    ->  hda,hda1-hda8\n";
 
 int makedevs_main(int argc, char **argv)
 {
@@ -38,6 +46,9 @@ int makedevs_main(int argc, char **argv)
        char devname[255];
        char buf[255];
 
+       if (argc < 7 || *argv[1]=='-')
+               usage(makedevs_usage);
+
        switch (type[0]) {
        case 'c':
                mode = S_IFCHR;