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source: MondoRescue/branches/3.2/mindi-busybox/docs/posix_conformance.txt

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Last change on this file was 2725, checked in by Bruno Cornec, 13 years ago
Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
Property svn:eol-style set to `native`
File size: 24.9 KB

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1
2	Busybox POSIX conformance table
3
4	See POSIX documentation (1003.1-2008) here:
5	http://www.opengroup.org/onlinepubs/9699919799/
6	And the complete list of all utilities that POSIX covers:
7	http://www.opengroup.org/onlinepubs/9699919799/idx/utilities.html
8
9	This listing is a work in progress, and currently only covers
10	tool options (not operands, environment variables, return codes, etc..).
11	For each option it is set if it (a) exists and (b) compliant to POSIX 2008.
12	Some options exist but there is no value in the 'compliant' column: that
13	means no one has yet bothered to make sure that the option does what it is
14	required to do.
15
16	-----------------------------------------------
17
18	POSIX Tools supported only as shell built-ins (ash shell):
19	alias, bg, cd, fg, getopts, hash, jobs, read, type, umask, ulimit,
20	unalias, wait, write
21
22	POSIX Tools not supported:
23	asa, at, batch, bc, c99, command, compress, csplit, ex, fc, file,
24	gencat, getconf, iconv, join, link, locale, localedef, lp, m4,
25	mailx, newgrp, nl, paste, pathchk, pax, pr, qalter, qdel, qhold, qmove,
26	qmsg, qrerun, qrls, qselect, qsig, qstat, qsub, tabs, talk, tput,
27	tsort, unlink, uucp, uustat, uux
28
29	POSIX Tools not supported (DEVELOPMENT):
30	admin, cflow, ctags, cxref, delta, fort77, get, lex, make, nm, prs, rmdel,
31	sact, sccs, strip, unget, val, what, yacc
32
33
34	POSIX Tools supported:
35
36	Note: echo, printf, kill, pwd documented here as stand-alone applets,
37	not as ash built-ins.
38
39
40	ar POSIX options ********************* Failed to recognize zip & tar (did not compare to regular ar)
41	option \| exists \| compliant \| remarks
42	-C \| no \| no \|
43	-T \| no \| no \|
44	-a \| no \| no \|
45	-b \| no \| no \|
46	-c \| no \| no \|
47	-d \| no \| no \|
48	-i \| no \| no \|
49	-m \| no \| no \|
50	-p \| yes \| \|
51	-q \| no \| no \|
52	-r \| no \| no \|
53	-s \| no \| no \|
54	-t \| yes \| \|
55	-u \| no \| no \|
56	-v \| yes \| \|
57	-x \| yes \| \|
58	ar Busybox specific options:
59	-o
60
61	awk POSIX options
62	option \| exists \| compliant \| remarks
63	-F ERE \| yes \| \|
64	-f progfile \| yes \| \|
65	-v assignment \| yes \| \|
66	awk Busybox specific options: None
67
68	basename POSIX options: None
69	basename Busybox specific options: None
70
71	cal POSIX options: None
72	cal Busybox specific options:
73	-y, -j
74
75	cat POSIX options
76	option \| exists \| compliant \| remarks
77	-u \| yes \| no \| option is ignored
78	cat Busybox specific options: None
79
80	chgrp POSIX options
81	option \| exists \| compliant \| remarks
82	-H \| yes \| \|
83	-L \| yes \| \|
84	-P \| yes \| \|
85	-R \| yes \| \|
86	-h \| yes \| \|
87	chgrp Busybox specific options:
88	-f, -c, -v
89
90	chmod POSIX options
91	option \| exists \| compliant \| remarks
92	-R \| yes \| yes \|
93	chmod Busybox specific options:
94	-f, -v, -c
95
96	chown POSIX options *********************************************
97	option \| exists \| compliant \| remarks
98	-H \| yes \| \| It seems like all flags are supported (according to printout), but
99	-L \| yes \| \| it fails to work on my machine
100	-P \| yes \| \|
101	-R \| yes \| \|
102	-h \| yes \| \|
103	chown Busybox specific options:
104	-f, -c, -v
105
106	cksum POSIX options: None
107	cksum Busybox specific options: None
108
109	cmp POSIX options
110	option \| exists \| compliant \| remarks
111	-l \| yes \| yes \|
112	-s \| yes \| yes \|
113	cmp Busybox specific options:
114
115
116	comm POSIX options
117	option \| exists \| compliant \| remarks
118	-1 \| yes \| yes \|
119	-2 \| yes \| yes \|
120	-3 \| yes \| yes \|
121	comm Busybox specific options: None
122
123	cp POSIX options
124	option \| exists \| compliant \| remarks
125	-H \| yes \| yes \|
126	-L \| yes \| yes \|
127	-P \| yes \| yes \|
128	-R \| yes \| yes \|
129	-f \| yes \| yes \|
130	-i \| yes \| yes \|
131	-p \| yes \| yes \|
132	cp Busybox specific options:
133	-d, -a, -s, -c, -r, -l
134
135	crontab POSIX options
136	option \| exists \| compliant \| remarks
137	-e \| yes \| \|
138	-l \| yes \| \|
139	-r \| yes \| \|
140	crontab Busybox specific options:
141	-u, -c
142
143	cut POSIX options
144	option \| exists \| compliant \| remarks
145	-b list \| yes \| yes \|
146	-c list \| yes \| yes \|
147	-d delim \| yes \| yes \|
148	-f list \| yes \| yes \|
149	-n \| yes \| yes \|
150	-s \| yes \| yes \|
151	cut Busybox specific options: None
152
153	date POSIX options
154	option \| exists \| compliant \| remarks
155	-u \| yes \| yes \|
156	date Busybox specific options:
157	-I[SPEC], -d TIME, -r FILE, -R, -D FMT
158
159	dd POSIX options:
160	option \| exists \| compliant \| remarks
161	if \| yes \| \|
162	of \| yes \| \|
163	ibs \| yes \| \|
164	obs \| yes \| \|
165	bs \| yes \| \|
166	cbs \| no \| no \|
167	skip \| yes \| \|
168	seek \| yes \| \|
169	count \| yes \| \|
170	conv=ascii \| no \| no \|
171	conv=ebcdic \| no \| no \|
172	conv=ibm \| no \| no \|
173	conv=block \| no \| no \|
174	conv=unblock \| no \| no \|
175	conv=lcase \| no \| no \|
176	conv=ucase \| no \| no \|
177	conv=swap \| no \| no \|
178	conv=noerror \| yes \| \|
179	conv=notrunc \| yes \| \|
180	conv=sync \| yes \| \|
181	dd Busybox specific options:
182	conv=fsync
183
184	df POSIX options
185	option \| exists \| compliant \| remarks
186	-P \| yes \| yes \|
187	-k \| yes \| yes \|
188	-t \| no \| no \|
189	df Busybox specific options:
190	-a, -m, -B SIZE, -i, -h
191	Remark:
192	- It seems that GNU df does not round percents up in its output (thus its results are a bit different)
193
194	diff POSIX options
195	option \| exists \| compliant \| remarks
196	-C n \| no \| no \|
197	-U n \| yes \| \|
198	-b \| yes \| \|
199	-c \| no \| no \|
200	-e \| no \| no \|
201	-f \| no \| no \|
202	-r \| yes \| \|
203	-u \| no \| no \|
204	diff Busybox specific options:
205	-d, -a, -s, -t, -L, -N, -i, -T, -w, -q, -S
206
207	dirname POSIX options: None
208	dirname Busybox specific options: None
209
210	du POSIX options
211	option \| exists \| compliant \| remarks
212	-H \| yes \| \|
213	-L \| yes \| \|
214	-a \| yes \| \|
215	-k \| yes \| \|
216	-s \| yes \| \|
217	-x \| yes \| \|
218	du Busybox specific options:
219	-c, -m, -h, -d N, -l
220
221
222	echo POSIX options: None
223	option \| exists \| compliant \| remarks
224	-n \| yes \| yes \| The result of -n is "implementation-defined"
225	echo Busybox specific options:
226	-e, -E
227
228	ed POSIX options
229	option \| exists \| compliant \| remarks
230	-p string \| no \| no \|
231	-s \| no \| no \|
232	ed Busybox specific options: None
233
234	env POSIX options
235	option \| exists \| compliant \| remarks
236	-i \| no \| no \|
237	env Busybox specific options:
238	-u, -, -i
239
240	expand POSIX options
241	option \| exists \| compliant \| remarks
242	-t tablist \| yes \| yes \|
243	expand Busybox specific options:
244	--tabs=N, -i, --initial
245
246	expr POSIX operations:
247	option \| exists \| compliant \| remarks
248	\| \| yes \| yes \|
249	& \| yes \| yes \|
250	= \| yes \| yes \|
251	> \| yes \| yes \|
252	>= \| yes \| yes \|
253	<= \| yes \| yes \|
254	< \| yes \| yes \|
255	!= \| yes \| yes \|
256	+ \| yes \| yes \|
257	- \| yes \| yes \|
258	* \| yes \| yes \|
259	/ \| yes \| yes \|
260	% \| yes \| yes \|
261	: \| yes \| yes \|
262	(expr) \| yes \| yes \|
263	integer \| yes \| yes \|
264	string \| yes \| yes \|
265	expr Busybox specific operations:
266	match, substr, index, length, quote
267
268	false POSIX options: None
269	false Busybox specific options: None
270
271	find POSIX options
272	option \| exists \| compliant \| remarks
273	-H \| no \| no \|
274	-L \| no \| no \|
275	find Busybox specific options:
276	-group NAME, -mtime DAYS, -print, -maxdepth N, -exec CMD ARG ;, -newer FILE, -context, -iname PATTERN, -follow, -depth, -xdev, -inum N, -type X, -print0, -mindepth N, -mmin MINS, -regex PATTERN, -prune, -path PATTERN, -user NAME, -delete, -perm NNN, -name PATTERN, -size N[bck]
277
278	fold POSIX options
279	option \| exists \| compliant \| remarks
280	-b \| yes \| yes \|
281	-s \| yes \| yes \|
282	-w width \| yes \| yes \|
283	fold Busybox specific options: None
284
285	fuser POSIX options
286	option \| exists \| compliant \| remarks
287	-c \| no \| no \|
288	-f \| no \| no \|
289	-u \| no \| no \|
290	fuser Busybox specific options:
291	-m, -k, -4, -SIGNAL, -6, -s
292
293	grep POSIX options
294	option \| exists \| compliant \| remarks
295	-E \| yes \| \|
296	-F \| yes \| \|
297	-c \| yes \| \|
298	-e pattern_list \| yes \| \|
299	-f pattern_file \| yes \| \|
300	-i \| yes \| \|
301	-l \| yes \| \|
302	-n \| yes \| \|
303	-q \| yes \| \|
304	-s \| yes \| \|
305	-v \| yes \| \|
306	-x \| no \| no \|
307	grep Busybox specific options:
308	-A, -C, -B, -L, -H, -o, -h, -w, -r, -z, -m MAX
309
310	head POSIX options
311	option \| exists \| compliant \| remarks
312	-n number \| yes \| yes \|
313	head Busybox specific options:
314	-v, -c NUM, -q
315
316	id POSIX options
317	option \| exists \| compliant \| remarks
318	-G \| yes \| yes \|
319	-g \| yes \| yes \|
320	-n \| yes \| yes \|
321	-r \| yes \| yes \|
322	-u \| yes \| yes \|
323	id Busybox specific options:
324	-Z
325
326	ipcrm POSIX options
327	option \| exists \| compliant \| remarks
328	-M shmkey \| no \| no \|
329	-Q msgkey \| no \| no \|
330	-S semkey \| no \| no \|
331	-m shmid \| no \| no \|
332	-q msgid \| no \| no \|
333	-s semid \| no \| no \|
334	ipcrm Busybox specific options:
335	-mM, -qQ, -sS
336
337	ipcs POSIX options
338	option \| exists \| compliant \| remarks
339	-a \| yes \| \|
340	-b \| no \| no \|
341	-c \| yes \| \|
342	-m \| yes \| \|
343	-o \| no \| no \|
344	-p \| yes \| \|
345	-q \| yes \| \|
346	-s \| yes \| \|
347	-t \| yes \| \|
348	ipcs Busybox specific options:
349	-l, -i, -u
350
351	kill POSIX options
352	option \| exists \| compliant \| remarks
353	-l \| yes \| yes \|
354	-s signal_name \| yes \| yes \|
355	-signal_name \| yes \| yes \|
356	-signal_number \| yes \| yes \|
357	kill Busybox specific options:
358	-q, -o
359
360	ln POSIX options
361	option \| exists \| compliant \| remarks
362	-L \| no \| no \|
363	-P \| no \| no \|
364	-f \| yes \| yes \|
365	-s \| yes \| yes \|
366	ln Busybox specific options:
367	-S suf, -n, -b
368
369	logger POSIX options: None
370	logger Busybox specific options:
371	-p PRIO, -t TAG, -s
372
373	logname POSIX options: None
374	logname Busybox specific options: None
375
376	ls POSIX options
377	option \| exists \| compliant \| remarks
378	-1 \| yes \| yes \|
379	-A \| yes \| yes \|
380	-C \| yes \| yes \|
381	-F \| yes \| yes \| And more: '=' for sockets (not defined by POSIX)
382	-H \| no \| no \|
383	-L \| yes \| yes \| But coloring may be wrong (at least POSIX does not require correct colors :) )
384	-R \| yes \| yes \|
385	-S \| yes \| yes \|
386	-a \| yes \| yes \|
387	-c \| yes \| no \| Sorts output with '-l' (should only show ctime with '-l', and sort only with '-t')
388	-d \| yes \| no \| When invoked together with '-L' should read symbolic links, and doesn't
389	-f \| no \| no \|
390	-g \| no \| no \|
391	-i \| yes \| yes \|
392	-k \| yes \| no \| Does something completely unrelated! (Lists security context instead of specifying block size)
393	-l \| yes \| yes \|
394	-m \| no \| no \|
395	-n \| yes \| no \| Works correctly only together with '-l' (but POSIX requires '-l' to be implicitly assumed)
396	-o \| no \| no \|
397	-p \| yes \| yes \|
398	-q \| no \| no \|
399	-r \| yes \| yes \|
400	-s \| yes \| yes \|
401	-t \| yes \| yes \|
402	-u \| yes \| yes \|
403	-x \| yes \| yes \|
404	ls Busybox specific options:
405	--color, -T NUM, -K, -X, -Z, -e, -h, -v, -w NUM
406
407	man POSIX options
408	option \| exists \| compliant \| remarks
409	-k \| no \| no \|
410	man Busybox specific options:
411	-a Display all pages
412
413
414	mesg POSIX options: None
415	mesg Busybox specific options: None
416
417	mkdir POSIX options
418	option \| exists \| compliant \| remarks
419	-m mode \| yes \| yes \|
420	-p \| yes \| yes \|
421	mkdir Busybox specific options:
422	-Z
423
424	mkfifo POSIX options
425	option \| exists \| compliant \| remarks
426	-m mode \| yes \| yes \|
427	mkfifo Busybox specific options:
428	-Z
429
430	more POSIX options
431	option \| exists \| compliant \| remarks
432	-c \| no \| no \|
433	-e \| no \| no \|
434	-i \| no \| no \|
435	-n number \| no \| no \|
436	-p command \| no \| no \|
437	-s \| no \| no \|
438	-t tagstring \| no \| no \|
439	-u \| no \| no \|
440	more Busybox specific options: None
441
442	mv POSIX options
443	option \| exists \| compliant \| remarks
444	-f \| yes \| yes \|
445	-i \| yes \| yes \|
446	mv Busybox specific options: None
447
448	nice POSIX options
449	option \| exists \| compliant \| remarks
450	-n increment \| yes \| yes \|
451	nice Busybox specific options: None
452
453	nohup POSIX options: None
454	nohup Busybox specific options: None
455
456	od POSIX options
457	option \| exists \| compliant \| remarks
458	-A address_base \| no \| no \|
459	-N count \| no \| no \|
460	-b \| no \| no \|
461	-c \| no \| no \|
462	-d \| no \| no \|
463	-j skip \| no \| no \|
464	-o \| no \| no \|
465	-s \| no \| no \|
466	-t type_string \| no \| no \|
467	-v \| no \| no \|
468	-x \| no \| no \|
469	od Busybox specific options: None
470
471	patch POSIX options
472	option \| exists \| compliant \| remarks
473	-D define \| no \| no \|
474	-N \| no \| no \|
475	-R \| yes \| yes \|
476	-b \| no \| no \|
477	-c \| no \| no \|
478	-d dir \| no \| no \|
479	-e \| no \| no \|
480	-i patchfile \| yes \| yes \|
481	-l \| no \| no \|
482	-n \| no \| no \|
483	-o outfile \| no \| no \|
484	-p num \| yes \| yes \|
485	-r rejectfile \| no \| no \|
486	-u \| no \| no \|
487	patch Busybox specific options: None
488
489	printf POSIX options: None
490	printf Busybox specific options: None
491
492	ps POSIX options
493	option \| exists \| compliant \| remarks
494	-A \| no \| no \|
495	-G grouplist \| no \| no \|
496	-U userlist \| no \| no \|
497	-a \| no \| no \|
498	-d \| no \| no \|
499	-e \| no \| no \|
500	-f \| no \| no \|
501	-g grouplist \| no \| no \|
502	-l \| no \| no \|
503	-n namelist \| no \| no \|
504	-o format \| yes \| no \| not supported: ruser, group, rgroup, pcpu
505	-p proclist \| no \| no \|
506	-t termlist \| no \| no \|
507	-u userlist \| no \| no \|
508	ps Busybox specific options: None
509
510	pwd POSIX options
511	option \| exists \| compliant \| remarks
512	-L \| no \| no \|
513	-P \| no \| no \|
514	pwd Busybox specific options: None
515
516	renice POSIX options
517	option \| exists \| compliant \| remarks
518	-g \| yes \| yes \|
519	-n increment \| yes \| yes \| Note POSIX allows only to run with this option (busybox also allows to run without '-n' and set niceness directly)
520	-p \| yes \| yes \|
521	-u \| yes \| yes \|
522	renice Busybox specific options: None
523
524	rm POSIX options
525	option \| exists \| compliant \| remarks
526	-R \| yes \| yes \|
527	-f \| yes \| yes \|
528	-i \| yes \| yes \|
529	-r \| yes \| yes \|
530	rm Busybox specific options: None
531
532	rmdir POSIX options
533	option \| exists \| compliant \| remarks
534	-p \| yes \| yes \|
535	rmdir Busybox specific options:
536	--parents
537
538	sed POSIX options
539	option \| exists \| compliant \| remarks
540	-e script \| yes \| \|
541	-f script_file \| yes \| \|
542	-n \| yes \| \|
543	sed Busybox specific options:
544	-i, -r
545
546	sh POSIX options
547	option \| exists \| compliant \| remarks
548	-c \| no \| no \|
549	-i \| no \| no \|
550	-s \| no \| no \|
551	sh Busybox specific options: None
552
553	sleep POSIX options: None
554	sleep Busybox specific options: None
555
556	sort POSIX options
557	option \| exists \| compliant \| remarks
558	-C \| no \| no \|
559	-b \| yes \| yes \|
560	-c \| yes \| yes \|
561	-d \| yes \| yes \|
562	-f \| yes \| yes \|
563	-i \| yes \| yes \| But is not like GNU sort, which isn't! (try to sort 'a\nA\nB\nb' with and without -f)
564	-k keydef \| yes \| \|
565	-m \| no \| no \|
566	-n \| yes \| yes \|
567	-o output \| yes \| yes \|
568	-r \| yes \| yes \|
569	-t char \| yes \| \|
570	-u \| yes \| yes \|
571	sort Busybox specific options:
572	-mST, -g, -M, -s, -z
573
574	split POSIX options
575	option \| exists \| compliant \| remarks
576	-a suffix_length \| yes \| yes \|
577	-b n \| yes \| yes \|
578	-b nk \| yes \| yes \|
579	-b nm \| yes \| yes \|
580	-l line_count \| yes \| yes \|
581	split Busybox specific options: None
582
583	strings POSIX options
584	option \| exists \| compliant \| remarks
585	-a \| yes \| yes \|
586	-n number \| yes \| yes \|
587	-t format \| no \| no \|
588	strings Busybox specific options:
589	-o, -f
590
591	stty POSIX options
592	option \| exists \| compliant \| remarks
593	-a \| yes \| yes \|
594	-g \| yes \| yes \|
595	stty Busybox specific options:
596	-F DEVICE
597
598	tail POSIX options
599	option \| exists \| compliant \| remarks
600	-c number \| yes \| yes \|
601	-f \| yes \| yes \|
602	-n number \| yes \| yes \|
603	tail Busybox specific options:
604	-v, -q, -s SEC
605
606	tee POSIX options
607	option \| exists \| compliant \| remarks
608	-a \| yes \| yes \|
609	-i \| yes \| yes \|
610	tee Busybox specific options: None
611
612	test POSIX options: None
613	test Busybox specific options: None
614
615	time POSIX options
616	option \| exists \| compliant \| remarks
617	-p \| no \| no \|
618	time Busybox specific options:
619	-v
620
621	touch POSIX options
622	option \| exists \| compliant \| remarks
623	-a \| no \| no \|
624	-c \| yes \| yes \|
625	-d date_time \| no \| no \|
626	-m \| no \| no \|
627	-r ref_file \| no \| no \|
628	-t time \| no \| no \|
629	touch Busybox specific options: None
630
631	tr POSIX options
632	option \| exists \| compliant \| remarks
633	-C \| no \| no \|
634	-c \| yes \| yes \|
635	-d \| yes \| yes \|
636	-s \| yes \| yes \|
637	tr Busybox specific options: None
638
639	true POSIX options: None
640	true Busybox specific options: None
641
642	tty POSIX options: None
643	tty Busybox specific options:
644	-s
645
646	uname POSIX options
647	option \| exists \| compliant \| remarks
648	-a \| yes \| yes \|
649	-m \| yes \| yes \|
650	-n \| yes \| yes \|
651	-r \| yes \| yes \|
652	-s \| yes \| yes \|
653	-v \| yes \| yes \|
654	uname Busybox specific options:
655	-p
656
657	uncompress POSIX options
658	option \| exists \| compliant \| remarks
659	-c \| yes \| yes \|
660	-f \| yes \| yes \|
661	-v \| no \| no \|
662	uncompress Busybox specific options: None
663
664	unexpand POSIX options
665	option \| exists \| compliant \| remarks
666	-a \| yes \| no \| POSIX requires converting two or more spaces to tabs, busybox converts one or more spaces
667	-t tablist \| yes \| yes \|
668	unexpand Busybox specific options:
669	--tabs=N, -f, --first-only, --all
670
671	uniq POSIX options
672	option \| exists \| compliant \| remarks
673	-c \| yes \| yes \|
674	-d \| yes \| yes \|
675	-f fields \| yes \| yes \|
676	-s chars \| yes \| yes \|
677	-u \| yes \| yes \|
678	uniq Busybox specific options:
679	-w N
680
681	uudecode POSIX options
682	option \| exists \| compliant \| remarks
683	-o outfile \| no \| no \|
684	uudecode Busybox specific options: None
685
686	uuencode POSIX options
687	option \| exists \| compliant \| remarks
688	-m \| yes \| yes \|
689	uuencode Busybox specific options: None
690
691	vi POSIX options
692	option \| exists \| compliant \| remarks
693	-R \| yes \| \|
694	-c command \| yes \| \|
695	-r \| no \| no \|
696	-t tagstring \| no \| no \|
697	-w size \| no \| no \|
698	vi Busybox specific options:
699	-H
700
701	wc POSIX options
702	option \| exists \| compliant \| remarks
703	-c \| yes \| yes \|
704	-l \| yes \| yes \|
705	-m \| no \| no \|
706	-w \| yes \| yes \|
707	wc Busybox specific options:
708	-L
709
710	who POSIX options
711	option \| exists \| compliant \| remarks
712	-H \| no \| no \|
713	-T \| no \| no \|
714	-a \| yes \| no \| just shows all
715	-b \| no \| no \|
716	-d \| no \| no \|
717	-l \| no \| no \|
718	-m \| no \| no \|
719	-p \| no \| no \|
720	-q \| no \| no \|
721	-r \| no \| no \|
722	-s \| no \| no \|
723	-t \| no \| no \|
724	-u \| no \| no \|
725	who Busybox specific options: None
726
727	xargs POSIX options
728	option \| exists \| compliant \| remarks
729	-E eofstr \| no \| no \|
730	-I replstr \| no \| no \|
731	-L number \| no \| no \|
732	-n number \| yes \| yes \|
733	-p \| yes \| yes \|
734	-s size \| yes \| yes \|
735	-t \| yes \| yes \|
736	-x \| yes \| yes \|
737	xargs Busybox specific options:
738	-e[STR], -0, -r
739
740	zcat POSIX options: None
741	zcat Busybox specific options: None

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