Cleanup usage() across sbase

Some tools didn't use argv0 for tool name, or usage() at all.

chgrp.c

@@ -37,7 +37,7 @@ chgrp(const char *path, struct stat *st, void *data, struct recursor *r)
 static void
 usage(void)
 {
-	eprintf("usage: chgrp [-h] [-R [-H | -L | -P]] group file ...\n");
+	eprintf("usage: %s [-h] [-R [-H | -L | -P]] group file ...\n", argv0);
 }
 
 int

chown.c

@@ -40,7 +40,8 @@ chownpwgr(const char *path, struct stat *st, void *data, struct recursor *r)
 static void
 usage(void)
 {
-	eprintf("usage: %s [-h] [-R [-H | -L | -P]] [owner][:[group]] file ...\n", argv0);
+	eprintf("usage: %s [-h] [-R [-H | -L | -P]] [owner][:[group]] "
+	        "file ...\n", argv0);
 }
 
 int

ed.c

@@ -13,7 +13,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "arg.h"
+#include "util.h"
 
 #define REGEXSIZE  100
 #define LINESIZE    80
@@ -1310,8 +1310,7 @@ doglobal(void)
 static void
 usage(void)
 {
-	fputs("ed [-s][-p][file]\n", stderr);
+	eprintf("usage: %s [-s] [-p] [file]\n", argv0);
-	exit(1);
 }
 
 static void

grep.c

@@ -166,7 +166,8 @@ end:
 static void
 usage(void)
 {
-	enprintf(Error, "usage: %s [-EFHchilnqsvwx] [-e pattern] [-f file] [pattern] [file ...]\n", argv0);
+	enprintf(Error, "usage: %s [-EFHchilnqsvwx] [-e pattern] [-f file] "
+	         "[pattern] [file ...]\n", argv0);
 }
 
 int

join.c

@@ -5,7 +5,6 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "arg.h"
 #include "text.h"
 #include "utf.h"
 #include "util.h"

renice.c

@@ -37,7 +37,7 @@ renice(int which, int who, long adj)
 static void
 usage(void)
 {
-	eprintf("renice -n num [-g | -p | -u] id ...\n");
+	eprintf("usage: %s -n num [-g | -p | -u] id ...\n", argv0);
 }
 
 int

seq.c

@@ -72,8 +72,8 @@ format:
 static void
 usage(void)
 {
-	eprintf("usage: %s [-f fmt] [-s sep] [-w] [startnum"
+	eprintf("usage: %s [-f fmt] [-s sep] [-w] "
-		       " [step]] endnum\n", argv0);
+	        "[startnum [step]] endnum\n", argv0);
 }
 
 int

tar.c

@@ -490,8 +490,10 @@ xt(int argc, char *argv[], int mode)
 static void
 usage(void)
 {
-	eprintf("usage: %s [-C dir] [-J | -Z | -a | -j | -z] -x [-m | -t] [-f file] [file ...]\n"
+	eprintf("usage: %s [-C dir] [-J | -Z | -a | -j | -z] -x [-m | -t] "
-		"       %s [-C dir] [-J | -Z | -a | -j | -z] [-h] -c path ... [-f file]\n", argv0, argv0);
+	        "[-f file] [file ...]\n"
+	        "       %s [-C dir] [-J | -Z | -a | -j | -z] [-h] -c path ... "
+	        "[-f file]\n", argv0, argv0);
 }
 
 int

touch.c

@@ -111,7 +111,8 @@ parsetime(char *str, time_t current)
 static void
 usage(void)
 {
-	eprintf("usage: %s [-acm] [-d time | -r ref_file | -t time | -T time] file ...\n", argv0);
+	eprintf("usage: %s [-acm] [-d time | -r ref_file | -t time | -T time] "
+	        "file ...\n", argv0);
 }
 
 int

which.c

@@ -9,7 +9,6 @@
 #include <string.h>
 #include <unistd.h>
 
-#include "arg.h"
 #include "util.h"
 
 static int aflag;

xargs.c

@@ -188,7 +188,8 @@ spawn(void)
 static void
 usage(void)
 {
-	eprintf("usage: %s [-rtx] [-E eofstr] [-n num] [-s num] [cmd [arg ...]]\n", argv0);
+	eprintf("usage: %s [-rtx] [-E eofstr] [-n num] [-s num] "
+	        "[cmd [arg ...]]\n", argv0);
 }
 
 int