exec.c revision 201366 
1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#ifndef lint
34#if 0
35static char sccsid[] = "@(#)exec.c	8.4 (Berkeley) 6/8/95";
36#endif
37#endif /* not lint */
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD: head/bin/sh/exec.c 201366 2010-01-01 18:17:46Z jilles $");
40
41#include <sys/types.h>
42#include <sys/stat.h>
43#include <unistd.h>
44#include <fcntl.h>
45#include <errno.h>
46#include <stdlib.h>
47
48/*
49 * When commands are first encountered, they are entered in a hash table.
50 * This ensures that a full path search will not have to be done for them
51 * on each invocation.
52 *
53 * We should investigate converting to a linear search, even though that
54 * would make the command name "hash" a misnomer.
55 */
56
57#include "shell.h"
58#include "main.h"
59#include "nodes.h"
60#include "parser.h"
61#include "redir.h"
62#include "eval.h"
63#include "exec.h"
64#include "builtins.h"
65#include "var.h"
66#include "options.h"
67#include "input.h"
68#include "output.h"
69#include "syntax.h"
70#include "memalloc.h"
71#include "error.h"
72#include "init.h"
73#include "mystring.h"
74#include "show.h"
75#include "jobs.h"
76#include "alias.h"
77
78
79#define CMDTABLESIZE 31		/* should be prime */
80#define ARB 1			/* actual size determined at run time */
81
82
83
84struct tblentry {
85	struct tblentry *next;	/* next entry in hash chain */
86	union param param;	/* definition of builtin function */
87	int special;		/* flag for special builtin commands */
88	short cmdtype;		/* index identifying command */
89	char rehash;		/* if set, cd done since entry created */
90	char cmdname[ARB];	/* name of command */
91};
92
93
94STATIC struct tblentry *cmdtable[CMDTABLESIZE];
95STATIC int builtinloc = -1;		/* index in path of %builtin, or -1 */
96int exerrno = 0;			/* Last exec error */
97
98
99STATIC void tryexec(char *, char **, char **);
100STATIC void printentry(struct tblentry *, int);
101STATIC struct tblentry *cmdlookup(const char *, int);
102STATIC void delete_cmd_entry(void);
103
104
105
106/*
107 * Exec a program.  Never returns.  If you change this routine, you may
108 * have to change the find_command routine as well.
109 */
110
111void
112shellexec(char **argv, char **envp, const char *path, int idx)
113{
114	char *cmdname;
115	int e;
116
117	if (strchr(argv[0], '/') != NULL) {
118		tryexec(argv[0], argv, envp);
119		e = errno;
120	} else {
121		e = ENOENT;
122		while ((cmdname = padvance(&path, argv[0])) != NULL) {
123			if (--idx < 0 && pathopt == NULL) {
124				tryexec(cmdname, argv, envp);
125				if (errno != ENOENT && errno != ENOTDIR)
126					e = errno;
127			}
128			stunalloc(cmdname);
129		}
130	}
131
132	/* Map to POSIX errors */
133	switch (e) {
134	case EACCES:
135		exerrno = 126;
136		break;
137	case ENOENT:
138		exerrno = 127;
139		break;
140	default:
141		exerrno = 2;
142		break;
143	}
144	if (e == ENOENT || e == ENOTDIR)
145		exerror(EXEXEC, "%s: not found", argv[0]);
146	exerror(EXEXEC, "%s: %s", argv[0], strerror(e));
147}
148
149
150STATIC void
151tryexec(char *cmd, char **argv, char **envp)
152{
153	int e;
154
155	execve(cmd, argv, envp);
156	e = errno;
157	if (e == ENOEXEC) {
158		initshellproc();
159		setinputfile(cmd, 0);
160		commandname = arg0 = savestr(argv[0]);
161		setparam(argv + 1);
162		exraise(EXSHELLPROC);
163		/*NOTREACHED*/
164	}
165	errno = e;
166}
167
168/*
169 * Do a path search.  The variable path (passed by reference) should be
170 * set to the start of the path before the first call; padvance will update
171 * this value as it proceeds.  Successive calls to padvance will return
172 * the possible path expansions in sequence.  If an option (indicated by
173 * a percent sign) appears in the path entry then the global variable
174 * pathopt will be set to point to it; otherwise pathopt will be set to
175 * NULL.
176 */
177
178const char *pathopt;
179
180char *
181padvance(const char **path, const char *name)
182{
183	const char *p, *start;
184	char *q;
185	int len;
186
187	if (*path == NULL)
188		return NULL;
189	start = *path;
190	for (p = start; *p && *p != ':' && *p != '%'; p++)
191		; /* nothing */
192	len = p - start + strlen(name) + 2;	/* "2" is for '/' and '\0' */
193	while (stackblocksize() < len)
194		growstackblock();
195	q = stackblock();
196	if (p != start) {
197		memcpy(q, start, p - start);
198		q += p - start;
199		*q++ = '/';
200	}
201	strcpy(q, name);
202	pathopt = NULL;
203	if (*p == '%') {
204		pathopt = ++p;
205		while (*p && *p != ':')  p++;
206	}
207	if (*p == ':')
208		*path = p + 1;
209	else
210		*path = NULL;
211	return stalloc(len);
212}
213
214
215
216/*** Command hashing code ***/
217
218
219int
220hashcmd(int argc __unused, char **argv __unused)
221{
222	struct tblentry **pp;
223	struct tblentry *cmdp;
224	int c;
225	int verbose;
226	struct cmdentry entry;
227	char *name;
228
229	verbose = 0;
230	while ((c = nextopt("rv")) != '\0') {
231		if (c == 'r') {
232			clearcmdentry(0);
233		} else if (c == 'v') {
234			verbose++;
235		}
236	}
237	if (*argptr == NULL) {
238		for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
239			for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
240				if (cmdp->cmdtype == CMDNORMAL)
241					printentry(cmdp, verbose);
242			}
243		}
244		return 0;
245	}
246	while ((name = *argptr) != NULL) {
247		if ((cmdp = cmdlookup(name, 0)) != NULL
248		 && (cmdp->cmdtype == CMDNORMAL
249		     || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
250			delete_cmd_entry();
251		find_command(name, &entry, 1, pathval());
252		if (verbose) {
253			if (entry.cmdtype != CMDUNKNOWN) {	/* if no error msg */
254				cmdp = cmdlookup(name, 0);
255				if (cmdp != NULL)
256					printentry(cmdp, verbose);
257				else
258					outfmt(out2, "%s: not found\n", name);
259			}
260			flushall();
261		}
262		argptr++;
263	}
264	return 0;
265}
266
267
268STATIC void
269printentry(struct tblentry *cmdp, int verbose)
270{
271	int idx;
272	const char *path;
273	char *name;
274
275	if (cmdp->cmdtype == CMDNORMAL) {
276		idx = cmdp->param.index;
277		path = pathval();
278		do {
279			name = padvance(&path, cmdp->cmdname);
280			stunalloc(name);
281		} while (--idx >= 0);
282		out1str(name);
283	} else if (cmdp->cmdtype == CMDBUILTIN) {
284		out1fmt("builtin %s", cmdp->cmdname);
285	} else if (cmdp->cmdtype == CMDFUNCTION) {
286		out1fmt("function %s", cmdp->cmdname);
287		if (verbose) {
288			INTOFF;
289			name = commandtext(getfuncnode(cmdp->param.func));
290			out1c(' ');
291			out1str(name);
292			ckfree(name);
293			INTON;
294		}
295#ifdef DEBUG
296	} else {
297		error("internal error: cmdtype %d", cmdp->cmdtype);
298#endif
299	}
300	if (cmdp->rehash)
301		out1c('*');
302	out1c('\n');
303}
304
305
306
307/*
308 * Resolve a command name.  If you change this routine, you may have to
309 * change the shellexec routine as well.
310 */
311
312void
313find_command(const char *name, struct cmdentry *entry, int printerr,
314    const char *path)
315{
316	struct tblentry *cmdp;
317	int idx;
318	int prev;
319	char *fullname;
320	struct stat statb;
321	int e;
322	int i;
323	int spec;
324
325	/* If name contains a slash, don't use the hash table */
326	if (strchr(name, '/') != NULL) {
327		entry->cmdtype = CMDNORMAL;
328		entry->u.index = 0;
329		return;
330	}
331
332	/* If name is in the table, and not invalidated by cd, we're done */
333	if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->rehash == 0)
334		goto success;
335
336	/* If %builtin not in path, check for builtin next */
337	if (builtinloc < 0 && (i = find_builtin(name, &spec)) >= 0) {
338		INTOFF;
339		cmdp = cmdlookup(name, 1);
340		cmdp->cmdtype = CMDBUILTIN;
341		cmdp->param.index = i;
342		cmdp->special = spec;
343		INTON;
344		goto success;
345	}
346
347	/* We have to search path. */
348	prev = -1;		/* where to start */
349	if (cmdp) {		/* doing a rehash */
350		if (cmdp->cmdtype == CMDBUILTIN)
351			prev = builtinloc;
352		else
353			prev = cmdp->param.index;
354	}
355
356	e = ENOENT;
357	idx = -1;
358loop:
359	while ((fullname = padvance(&path, name)) != NULL) {
360		stunalloc(fullname);
361		idx++;
362		if (pathopt) {
363			if (prefix("builtin", pathopt)) {
364				if ((i = find_builtin(name, &spec)) < 0)
365					goto loop;
366				INTOFF;
367				cmdp = cmdlookup(name, 1);
368				cmdp->cmdtype = CMDBUILTIN;
369				cmdp->param.index = i;
370				cmdp->special = spec;
371				INTON;
372				goto success;
373			} else if (prefix("func", pathopt)) {
374				/* handled below */
375			} else {
376				goto loop;	/* ignore unimplemented options */
377			}
378		}
379		/* if rehash, don't redo absolute path names */
380		if (fullname[0] == '/' && idx <= prev) {
381			if (idx < prev)
382				goto loop;
383			TRACE(("searchexec \"%s\": no change\n", name));
384			goto success;
385		}
386		if (stat(fullname, &statb) < 0) {
387			if (errno != ENOENT && errno != ENOTDIR)
388				e = errno;
389			goto loop;
390		}
391		e = EACCES;	/* if we fail, this will be the error */
392		if (!S_ISREG(statb.st_mode))
393			goto loop;
394		if (pathopt) {		/* this is a %func directory */
395			stalloc(strlen(fullname) + 1);
396			readcmdfile(fullname);
397			if ((cmdp = cmdlookup(name, 0)) == NULL || cmdp->cmdtype != CMDFUNCTION)
398				error("%s not defined in %s", name, fullname);
399			stunalloc(fullname);
400			goto success;
401		}
402#ifdef notdef
403		if (statb.st_uid == geteuid()) {
404			if ((statb.st_mode & 0100) == 0)
405				goto loop;
406		} else if (statb.st_gid == getegid()) {
407			if ((statb.st_mode & 010) == 0)
408				goto loop;
409		} else {
410			if ((statb.st_mode & 01) == 0)
411				goto loop;
412		}
413#endif
414		TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
415		INTOFF;
416		cmdp = cmdlookup(name, 1);
417		cmdp->cmdtype = CMDNORMAL;
418		cmdp->param.index = idx;
419		INTON;
420		goto success;
421	}
422
423	/* We failed.  If there was an entry for this command, delete it */
424	if (cmdp)
425		delete_cmd_entry();
426	if (printerr) {
427		if (e == ENOENT || e == ENOTDIR)
428			outfmt(out2, "%s: not found\n", name);
429		else
430			outfmt(out2, "%s: %s\n", name, strerror(e));
431	}
432	entry->cmdtype = CMDUNKNOWN;
433	entry->u.index = 0;
434	return;
435
436success:
437	cmdp->rehash = 0;
438	entry->cmdtype = cmdp->cmdtype;
439	entry->u = cmdp->param;
440	entry->special = cmdp->special;
441}
442
443
444
445/*
446 * Search the table of builtin commands.
447 */
448
449int
450find_builtin(const char *name, int *special)
451{
452	const struct builtincmd *bp;
453
454	for (bp = builtincmd ; bp->name ; bp++) {
455		if (*bp->name == *name && equal(bp->name, name)) {
456			*special = bp->special;
457			return bp->code;
458		}
459	}
460	return -1;
461}
462
463
464
465/*
466 * Called when a cd is done.  Marks all commands so the next time they
467 * are executed they will be rehashed.
468 */
469
470void
471hashcd(void)
472{
473	struct tblentry **pp;
474	struct tblentry *cmdp;
475
476	for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
477		for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
478			if (cmdp->cmdtype == CMDNORMAL
479			 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
480				cmdp->rehash = 1;
481		}
482	}
483}
484
485
486
487/*
488 * Called before PATH is changed.  The argument is the new value of PATH;
489 * pathval() still returns the old value at this point.  Called with
490 * interrupts off.
491 */
492
493void
494changepath(const char *newval)
495{
496	const char *old, *new;
497	int idx;
498	int firstchange;
499	int bltin;
500
501	old = pathval();
502	new = newval;
503	firstchange = 9999;	/* assume no change */
504	idx = 0;
505	bltin = -1;
506	for (;;) {
507		if (*old != *new) {
508			firstchange = idx;
509			if ((*old == '\0' && *new == ':')
510			 || (*old == ':' && *new == '\0'))
511				firstchange++;
512			old = new;	/* ignore subsequent differences */
513		}
514		if (*new == '\0')
515			break;
516		if (*new == '%' && bltin < 0 && prefix("builtin", new + 1))
517			bltin = idx;
518		if (*new == ':') {
519			idx++;
520		}
521		new++, old++;
522	}
523	if (builtinloc < 0 && bltin >= 0)
524		builtinloc = bltin;		/* zap builtins */
525	if (builtinloc >= 0 && bltin < 0)
526		firstchange = 0;
527	clearcmdentry(firstchange);
528	builtinloc = bltin;
529}
530
531
532/*
533 * Clear out command entries.  The argument specifies the first entry in
534 * PATH which has changed.
535 */
536
537void
538clearcmdentry(int firstchange)
539{
540	struct tblentry **tblp;
541	struct tblentry **pp;
542	struct tblentry *cmdp;
543
544	INTOFF;
545	for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
546		pp = tblp;
547		while ((cmdp = *pp) != NULL) {
548			if ((cmdp->cmdtype == CMDNORMAL &&
549			     cmdp->param.index >= firstchange)
550			 || (cmdp->cmdtype == CMDBUILTIN &&
551			     builtinloc >= firstchange)) {
552				*pp = cmdp->next;
553				ckfree(cmdp);
554			} else {
555				pp = &cmdp->next;
556			}
557		}
558	}
559	INTON;
560}
561
562
563/*
564 * Delete all functions.
565 */
566
567#ifdef mkinit
568MKINIT void deletefuncs(void);
569
570SHELLPROC {
571	deletefuncs();
572}
573#endif
574
575void
576deletefuncs(void)
577{
578	struct tblentry **tblp;
579	struct tblentry **pp;
580	struct tblentry *cmdp;
581
582	INTOFF;
583	for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
584		pp = tblp;
585		while ((cmdp = *pp) != NULL) {
586			if (cmdp->cmdtype == CMDFUNCTION) {
587				*pp = cmdp->next;
588				unreffunc(cmdp->param.func);
589				ckfree(cmdp);
590			} else {
591				pp = &cmdp->next;
592			}
593		}
594	}
595	INTON;
596}
597
598
599
600/*
601 * Locate a command in the command hash table.  If "add" is nonzero,
602 * add the command to the table if it is not already present.  The
603 * variable "lastcmdentry" is set to point to the address of the link
604 * pointing to the entry, so that delete_cmd_entry can delete the
605 * entry.
606 */
607
608STATIC struct tblentry **lastcmdentry;
609
610
611STATIC struct tblentry *
612cmdlookup(const char *name, int add)
613{
614	int hashval;
615	const char *p;
616	struct tblentry *cmdp;
617	struct tblentry **pp;
618
619	p = name;
620	hashval = *p << 4;
621	while (*p)
622		hashval += *p++;
623	hashval &= 0x7FFF;
624	pp = &cmdtable[hashval % CMDTABLESIZE];
625	for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
626		if (equal(cmdp->cmdname, name))
627			break;
628		pp = &cmdp->next;
629	}
630	if (add && cmdp == NULL) {
631		INTOFF;
632		cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB
633					+ strlen(name) + 1);
634		cmdp->next = NULL;
635		cmdp->cmdtype = CMDUNKNOWN;
636		cmdp->rehash = 0;
637		strcpy(cmdp->cmdname, name);
638		INTON;
639	}
640	lastcmdentry = pp;
641	return cmdp;
642}
643
644/*
645 * Delete the command entry returned on the last lookup.
646 */
647
648STATIC void
649delete_cmd_entry(void)
650{
651	struct tblentry *cmdp;
652
653	INTOFF;
654	cmdp = *lastcmdentry;
655	*lastcmdentry = cmdp->next;
656	ckfree(cmdp);
657	INTON;
658}
659
660
661
662/*
663 * Add a new command entry, replacing any existing command entry for
664 * the same name.
665 */
666
667void
668addcmdentry(const char *name, struct cmdentry *entry)
669{
670	struct tblentry *cmdp;
671
672	INTOFF;
673	cmdp = cmdlookup(name, 1);
674	if (cmdp->cmdtype == CMDFUNCTION) {
675		unreffunc(cmdp->param.func);
676	}
677	cmdp->cmdtype = entry->cmdtype;
678	cmdp->param = entry->u;
679	INTON;
680}
681
682
683/*
684 * Define a shell function.
685 */
686
687void
688defun(const char *name, union node *func)
689{
690	struct cmdentry entry;
691
692	INTOFF;
693	entry.cmdtype = CMDFUNCTION;
694	entry.u.func = copyfunc(func);
695	addcmdentry(name, &entry);
696	INTON;
697}
698
699
700/*
701 * Delete a function if it exists.
702 */
703
704int
705unsetfunc(const char *name)
706{
707	struct tblentry *cmdp;
708
709	if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->cmdtype == CMDFUNCTION) {
710		unreffunc(cmdp->param.func);
711		delete_cmd_entry();
712		return (0);
713	}
714	return (0);
715}
716
717/*
718 * Shared code for the following builtin commands:
719 *    type, command -v, command -V
720 */
721
722int
723typecmd_impl(int argc, char **argv, int cmd, const char *path)
724{
725	struct cmdentry entry;
726	struct tblentry *cmdp;
727	const char *const *pp;
728	struct alias *ap;
729	int i;
730	int error1 = 0;
731
732	if (path != pathval())
733		clearcmdentry(0);
734
735	for (i = 1; i < argc; i++) {
736		/* First look at the keywords */
737		for (pp = parsekwd; *pp; pp++)
738			if (**pp == *argv[i] && equal(*pp, argv[i]))
739				break;
740
741		if (*pp) {
742			if (cmd == TYPECMD_SMALLV)
743				out1fmt("%s\n", argv[i]);
744			else
745				out1fmt("%s is a shell keyword\n", argv[i]);
746			continue;
747		}
748
749		/* Then look at the aliases */
750		if ((ap = lookupalias(argv[i], 1)) != NULL) {
751			if (cmd == TYPECMD_SMALLV)
752				out1fmt("alias %s='%s'\n", argv[i], ap->val);
753			else
754				out1fmt("%s is an alias for %s\n", argv[i],
755				    ap->val);
756			continue;
757		}
758
759		/* Then check if it is a tracked alias */
760		if ((cmdp = cmdlookup(argv[i], 0)) != NULL) {
761			entry.cmdtype = cmdp->cmdtype;
762			entry.u = cmdp->param;
763			entry.special = cmdp->special;
764		}
765		else {
766			/* Finally use brute force */
767			find_command(argv[i], &entry, 0, path);
768		}
769
770		switch (entry.cmdtype) {
771		case CMDNORMAL: {
772			if (strchr(argv[i], '/') == NULL) {
773				const char *path2 = path;
774				char *name;
775				int j = entry.u.index;
776				do {
777					name = padvance(&path2, argv[i]);
778					stunalloc(name);
779				} while (--j >= 0);
780				if (cmd == TYPECMD_SMALLV)
781					out1fmt("%s\n", name);
782				else
783					out1fmt("%s is%s %s\n", argv[i],
784					    (cmdp && cmd == TYPECMD_TYPE) ?
785						" a tracked alias for" : "",
786					    name);
787			} else {
788				if (eaccess(argv[i], X_OK) == 0) {
789					if (cmd == TYPECMD_SMALLV)
790						out1fmt("%s\n", argv[i]);
791					else
792						out1fmt("%s is %s\n", argv[i],
793						    argv[i]);
794				} else {
795					if (cmd != TYPECMD_SMALLV)
796						outfmt(out2, "%s: %s\n",
797						    argv[i], strerror(errno));
798					error1 |= 127;
799				}
800			}
801			break;
802		}
803		case CMDFUNCTION:
804			if (cmd == TYPECMD_SMALLV)
805				out1fmt("%s\n", argv[i]);
806			else
807				out1fmt("%s is a shell function\n", argv[i]);
808			break;
809
810		case CMDBUILTIN:
811			if (cmd == TYPECMD_SMALLV)
812				out1fmt("%s\n", argv[i]);
813			else if (entry.special)
814				out1fmt("%s is a special shell builtin\n",
815				    argv[i]);
816			else
817				out1fmt("%s is a shell builtin\n", argv[i]);
818			break;
819
820		default:
821			if (cmd != TYPECMD_SMALLV)
822				outfmt(out2, "%s: not found\n", argv[i]);
823			error1 |= 127;
824			break;
825		}
826	}
827
828	if (path != pathval())
829		clearcmdentry(0);
830
831	return error1;
832}
833
834/*
835 * Locate and print what a word is...
836 */
837
838int
839typecmd(int argc, char **argv)
840{
841	return typecmd_impl(argc, argv, TYPECMD_TYPE, bltinlookup("PATH", 1));
842}
843