chmod.1

操作系统设计与实现源码

%!PS-Adobe-1.0
%%Creator: devps (Pipeline Associates, Inc.)
%%CreationDate: Fri Sep 13 13:03:26 1996
%%Pages: (atend)
%%DocumentFonts: (atend)

/devps 180 dict def devps begin
/res 10.000000 def
/y_offset 843 def
/X{exch}bind def
/mm {transform round X round X itransform} bind def
/r{rmoveto}bind def
/m{moveto}bind def
/l{lineto}bind def
/rl{rlineto}bind def
/st{stroke}bind def
/gs{gsave}bind def
/gr{grestore}bind def
/cp{currentpoint}bind def
/np{newpath}bind def
/ct{curveto}bind def
systemdict /setpacking known
 { /savepacking currentpacking def true setpacking } if
/m0{0 0 moveto}bind def
/xc{//res div}bind def
/yc{//res neg div //y_offset add}bind def
/lc{yc X xc X l st}bind def
/mc{yc X xc X m}bind def
/el{gs /a X def a div 1 X scale cp np a xc 2 div 0 360 arc st gr}bind def
/ar{cp 7 2 roll np xc 5 1 roll atan 3 1 roll atan X arc st}bind def
/sp{yc X xc X 6 2 roll yc X xc X 6 2 roll yc X xc X 6 2 roll ct}bind def
/V{//res neg div //y_offset add
currentpoint pop X
m}bind def
/H{//res div
0 transform X round X itransform pop
currentpoint X pop
moveto}bind def
/h{//res div 0 r}bind def
/v{//res neg div 0 X r}bind def
/S{X H show}bind def
/A{H //res div 1 index stringwidth pop sub 1 index length div 0 3 2 roll ashow}bind def
/psize 10 def
/height 0 def
/cheight { height 0 ne { height } { psize } ifelse } bind def
/slant 0 def
/FF{findfont X dup 30 div 0 mm pop setlinewidth /psize X def
    [psize 0 cheight slant sin slant cos div mul cheight 0 0]
    makefont setfont}bind def
/shade{gs
 /dy X def
 /dx X def
 np m
 0 /dy rl
 /dx 0 rl
 0 /dy neg rl
 /dx neg 0 rl
 closepath
 .9 setgray
 fill
gr}bind def
1 setlinecap

/resolution res 72 mul def


/startFig {
	/SavedState save def
	userdict maxlength dict begin
	currentpoint transform

	DocumentInitState setmiterlimit setgray setdash setlinejoin setlinecap
		setlinewidth setmatrix

	itransform moveto

	/ury exch def
	/urx exch def
	/lly exch def
	/llx exch def
	/y exch 72 mul resolution div def
	/x exch 72 mul resolution div def
	
	currentpoint /cy exch def /cx exch def

	/sx x urx llx sub div def
	/sy y ury lly sub div def

	sx sy scale

	cx sx div llx sub
	cy sy div ury sub translate
	
	/DefFigCTM matrix currentmatrix def

	/initmatrix {
		DefFigCTM setmatrix
	} def
	/defaultmatrix {
		DefFigCTM exch copy
	} def

	/initgraphics {
		DocumentInitState setmiterlimit setgray setdash 
			setlinejoin setlinecap setlinewidth setmatrix
		DefFigCTM setmatrix
	} def

	/showpage {
		initgraphics
	} def

}bind  def
/clipFig {
	currentpoint 6 2 roll
	newpath 4 copy
	4 2 roll moveto
	6 -1 roll exch lineto
	exch lineto
	exch lineto
	closepath clip
	newpath
	moveto
}bind  def
/doclip { llx lly urx ury clipFig } def
/endFig {
	end SavedState restore
}bind  def
/globalstart {
	fontnum psize slant height resolution currentpoint 
	pagesave restore gsave 
}bind  def
/globalend {
	grestore moveto
	/resolution exch def /height exch def
	/slant exch def /psize exch def /fontnum exch def
	F
	/pagesave save def
}bind  def


/fontnum 1 def 
systemdict /setpacking known { savepacking setpacking} if
end
/BP{
save mark devps begin m0
/DocumentInitState [ matrix currentmatrix currentlinewidth currentlinecap
currentlinejoin currentdash currentgray currentmiterlimit ] cvx def
}bind def
/EP{
end cleartomark restore showpage}def

/Encoding-1 256 array def
0 1 255 {Encoding-1 exch /.notdef put} for
Encoding-1 8#301 StandardEncoding 8#101 26 getinterval putinterval %A-B
Encoding-1 8#341 StandardEncoding 8#141 26 getinterval putinterval %a-b
Encoding-1 8#241 StandardEncoding 8#301 16 getinterval putinterval %accents
Encoding-1 8#373 StandardEncoding 8#365 1 getinterval putinterval %dotlessi
Encoding-1
dup 8#41 /copyright put
dup 8#42 /registered put
dup 8#43 /trademark put
dup 8#44 /logicalnot put
dup 8#45 /Eth put
dup 8#46 /eth put
dup 8#47 /Thorn put
dup 8#50 /thorn put
dup 8#51 /brokenbar put
dup 8#52 /degree put
dup 8#53 /divide put
dup 8#54 /multiply put
dup 8#55 /minus put
dup 8#56 /onehalf put
dup 8#57 /onequarter put
dup 8#60 /threequarters put
dup 8#101 /Aacute put
dup 8#102 /Acircumflex put
dup 8#103 /Adieresis put
dup 8#104 /Agrave put
dup 8#105 /Aring put
dup 8#106 /Atilde put
dup 8#107 /Ccedilla put
dup 8#110 /Eacute put
dup 8#111 /Ecircumflex put
dup 8#112 /Edieresis put
dup 8#113 /Egrave put
dup 8#114 /Iacute put
dup 8#115 /Icircumflex put
dup 8#116 /Idieresis put
dup 8#117 /Igrave put
dup 8#120 /Ntilde put
dup 8#121 /Oacute put
dup 8#122 /Ocircumflex put
dup 8#123 /Odieresis put
dup 8#124 /Ograve put
dup 8#125 /Otilde put
dup 8#126 /Scaron put
dup 8#127 /Uacute put
dup 8#130 /Ucircumflex put
dup 8#131 /Udieresis put
dup 8#132 /Ugrave put
dup 8#133 /Ydieresis put
dup 8#134 /Zcaron put
dup 8#135 /aacute put
dup 8#136 /acircumflex put
dup 8#137 /adieresis put
dup 8#140 /agrave put
dup 8#141 /aring put
dup 8#142 /atilde put
dup 8#143 /ccedilla put
dup 8#144 /eacute put
dup 8#145 /ecircumflex put
dup 8#146 /edieresis put
dup 8#147 /egrave put
dup 8#150 /iacute put
dup 8#151 /icircumflex put
dup 8#152 /idieresis put
dup 8#153 /igrave put
dup 8#154 /ntilde put
dup 8#155 /oacute put
dup 8#156 /ocircumflex put
dup 8#157 /odieresis put
dup 8#160 /ograve put
dup 8#161 /otilde put
dup 8#162 /scaron put
dup 8#163 /uacute put
dup 8#164 /ucircumflex put
dup 8#165 /udieresis put
dup 8#166 /ugrave put
dup 8#167 /ydieresis put
dup 8#170 /zcaron put
pop

/Enc-dict 30 dict def
Enc-dict /tmpstr1 50 string put
Enc-dict /tmpstr2 50 string put
Enc-dict /tmpstr3 50 string dup (Encoding-) exch cvs pop put
/AEnc-def { % arguments: the original font's name, encoding nr
Enc-dict begin
tmpstr2 cvs /Enc-no exch def % Remember the number in a string
dup /OrigName exch def % remember the name
findfont dup maxlength dict /newdict exch def % get dictionary for new font
{ exch dup /FID ne
   { exch newdict 3 1 roll put }
   { pop pop } % Ignore FID
   ifelse
} forall
newdict begin
/Encoding
  tmpstr3 9 Enc-no putinterval tmpstr3 0 9 Enc-no length add getinterval
  cvn load
  def % Replace encoding
currentdict /UniqueID known
{ /UniqueID UniqueID Enc-no cvi 49999 mul add def } if % Derive New UniqueID
end % newdict
/FNlength OrigName tmpstr1 cvs length def % convert name, remember length
FNlength 1 add Enc-no length add string
dup 0 OrigName tmpstr1 cvs putinterval
dup FNlength (-) putinterval
dup FNlength 1 add Enc-no putinterval
dup 0 tmpstr1 0 FNlength getinterval putinterval % Add old name
cvn dup newdict /FontName 3 2 roll put newdict definefont
end % Enc-dict
} def
/Times-Roman 1 AEnc-def pop
/R-1{/Times-Roman-1 FF}def
/Times-Bold 1 AEnc-def pop
/B-1{/Times-Bold-1 FF}def
/Times-Italic 1 AEnc-def pop
/I-1{/Times-Italic-1 FF}def
/R{/Times-Roman FF}def
/B{/Times-Bold FF}def
/I{/Times-Italic FF}def
%%EndProlog
%%Page: 1 1
BP
/slant 0 def
/height 0 def
480 V
10 R
720(CHMOD)S
1103(\()S
1145(1)S
1203(\))S
2696(Eighth)S
(Edition)296 2989 A
4744(CHMOD)S
5127(\()S
5169(1)S
5227(\))S
960 V
9 R
720(N)S
722(NA)S
790(AM)S
858(ME)S
940(E)S
1080 V
10 R
1080(chmod)S
10 R-1
1378(-)S
10 R
1460(change)S
(access)258 1770 A
2053(mode)S
2301(for)S
2444(\256les)S
1248 V
9 R
720(S)S
722(SY)S
774(YN)S
842(NO)S
910(OP)S
978(PS)S
1030(SI)S
1082(IS)S
1115(S)S
1368 V
10 B
1080(chmod)S
1409([)S
10 B-1
1443(-)S
10 B
1500(R)S
10 R
1573(])S
10 I
1645(mode)S
1901(\256le)S
10 R
(...)75 2062 A
1536 V
9 R
720(O)S
722(OP)S
790(PT)S
842(TI)S
900(IO)S
933(ON)S
1001(NS)S
1069(S)S
1656 V
10 B-1
1080(-)S
10 B
1137(R)S
10 R
1440(Change)S
1772(hierarchies)S
2240(recursively)S
1824 V
9 R
720(E)S
722(EX)S
780(XA)S
848(AM)S
916(MP)S
998(PL)S
1050(LE)S
1108(ES)S
1166(S)S
1944 V
10 B
1080(chmod)S
[phone] A
1571(file)S
10 R
2080(#)S
2155(Owner:)S
2483(rwx)S
(Group:)285 2665 A
2975(r)S
10 R-1
3009(-)S
10 R
3066(x)S
3141(Others:)S
3463(r)S
10 R-1
3497(-)S
10 R
3554(x)S
2112 V
10 B
1080(chmod)S
1396(+x)S
1528(file1)S
1738(file2)S
10 R
2080(#)S
2155(Make)S
10 I
2409(\256le1)S
10 R
2607(and)S
10 I
2777(\256le2)S
10 R
2975(executable)S
2280 V
10 B
1080(chmod)S
1396(a)S
10 B-1
1446(-)S
10 B
1503(w)S
1601(file)S
10 R
2080(#)S
2155(Make)S
10 I
2409(\256le)S
10 R
2557(read)S
2756(only)S
2448 V
10 B
1080(chmod)S
1396(u+s)S
1573(file)S
10 R
2080(#)S
2155(Turn)S
2376(on)S
2501(SETUID)S
2886(for)S
10 I
3029(\256le)S
2616 V
10 B
1080(chmod)S
10 B-1
1396(-)S
10 B
1453(R)S
1551(o+w)S
1756(dir)S
10 R
2080(#)S
2155(Allow)S
(writing)291 2432 A
2748(for)S
2891(all)S
3017(\256les)S
3210(in)S
3313(dir)S
2784 V
9 R
720(D)S
722(DE)S
790(ES)S
848(SC)S
900(CR)S
962(RI)S
1024(IP)S
1057(PT)S
1109(TI)S
1167(IO)S
1200(ON)S
1268(N)S
2904 V
10 R
1080(The)S
1269(given)S
1524(mode)S
1779(is)S
1878(applied)S
2206(to)S
(each)185 2316 A
2533(\256le)S
2694(in)S
2804(the)S
2959(\256le)S
3120(list.)S
3300(If)S
3400(the)S
10 B-1
3555(-)S
10 B
3612(R)S
10 R
3718(\257ag)S
3902(is)S
4002(present,)S
4351(the)S
4507(\256les)S
4708(in)S
4819(a)S
4897(directory)S
3024 V
(will)157 1080 A
1264(be)S
1386(changed)S
1748(as)S
1859(well.)S
2110(The)S
2294(mode)S
2544(can)S
2711(be)S
2833(either)S
3090(absolute)S
3451(or)S
3561(symbolic.)S
3980(Absolute)S
4369(modes)S
4657(are)S
4807(given)S
5056(as)S
5166(an)S
3144 V
1080(octal)S
1301(number)S
1633(that)S
1809(represents)S
2243(the)S
2391(new)S
2584(\256le)S
2738(mode.)S
3011(The)S
3193(mode)S
3441(bits)S
3611(are)S
3760(de\256ned)S
4081(as)S
4190(follows:)S
3312 V
(4000)200 1260 A
1560(Set)S
1714(effective)S
2093(user)S
2286(id)S
2389(on)S
2514(execution)S
2930(to)S
3033(\256le's)S
3260(owner)S
3537(id)S
3432 V
(2000)200 1260 A
1560(Set)S
1714(effective)S
(group)234 2093 A
2352(id)S
2455(on)S
2580(execution)S
2996(to)S
3099(\256le's)S
(group)234 3326 A
3585(id)S
3552 V
[phone] A
1560(\256le)S
1714(is)S
1806(readable)S
2173(by)S
2298(the)S
2446(owner)S
2723(of)S
2832(the)S
2980(\256le)S
3672 V
[phone] A
1560(writeable)S
1961(by)S
2086(owner)S
3792 V
[phone] A
1560(executable)S
2016(by)S
2141(owner)S
3912 V
[phone] A
1560(same)S
1792(as)S
(above,)265 1901 A
2191(for)S
2334(other)S
2566(users)S
2798(in)S
2901(the)S
3049(same)S
(group)234 3281 A
4032 V
[phone] A
1560(same)S
1792(as)S
(above,)265 1901 A
2191(for)S
2334(all)S
2460(other)S
2692(users)S
4200 V
1080(Symbolic)S
1490(modes)S
1777(modify)S
2092(the)S
2240(current)S
2551(\256le)S
2705(mode)S
2953(in)S
3056(a)S
3126(speci\256ed)S
3509(way.)S
3727(The)S
3909(form)S
4130(is:)S
4368 V
1260([who])S
1526(op)S
1651(permissions)S
2156({)S
2229(op)S
2354(permissions)S
(...})123 2859 A
3007({,)S
3105([who])S
3371(op)S
(...)75 3496 A
3596(})S
4536 V
1080(The)S
(possibilities)480 1266 A
1775(for)S
10 I
1922(who)S
10 R
2118(are)S
10 I
2271(u)S
10 R
2321(,)S
10 I
2375(g)S
10 R
2425(,)S
10 I
2479(o)S
10 R
2529(,)S
2583(and)S
10 I
2757(a)S
10 R
2807(,)S
2861(standing)S
3230(for)S
3377(user,)S
(group,)259 3599 A
3887(other)S
4123(and)S
4298(all,)S
4454(respectively.)S
4996(If)S
10 I
5094(who)S
4656 V
10 R
1080(is)S
(omitted,)332 1176 A
10 I
1537(a)S
10 R
1616(is)S
1712(assumed,)S
2112(but)S
2269(the)S
2421(current)S
2736(umask)S
3027(is)S
3123(used.)S
3361(The)S
3546(op)S
3674(can)S
3842(be)S
10 I
3965(+)S
10 R
4033(,)S
10 I
4086(-)S
10 R
4120(,)S
4173(or)S
10 I
4285(=)S
10 R
4353(;)S
10 I
4434(+)S
10 R
4530(turns)S
4759(on)S
4887(the)S
5038(given)S
4776 V
1080(permissions,)S
10 I-1
1615(-)S
10 R
1713(turns)S
1944(them)S
2175(off;)S
10 I
2351(=)S
10 R
2449(sets)S
2630(the)S
2783(permissions)S
3293(exclusively)S
3781(for)S
3929(the)S
4082(given)S
10 I
4335(who)S
10 R
4502(.)S
4557(For)S
4727(example)S
10 I
5098(g=x)S
4896 V
10 R
1080(sets)S
1256(the)S
(group)234 1404 A
1663(permissions)S
2168(to)S
10 I
2271(--x)S
10 R
2384(.)S
5064 V
1080(The)S
1265(possible)S
1622(permissions)S
2130(are)S
10 I
2282(r)S
10 R
2321(,)S
10 I
2374(w)S
10 R
2441(,)S
10 I
2494(x)S
10 R
2539(;)S
2595(which)S
2869(stand)S
3109(for)S
3255(read,)S
3482(write,)S
3743(and)S
3916(execute;)S
10 I
4305(s)S
10 R
4372(turns)S
4602(on)S
4731(the)S
4883(set)S
5024(effec-)S
5184 V
1080(tive)S
(user/group)430 1256 A
1711(id)S
1814(bits.)S
10 I
2009(s)S
10 R
2073(only)S
2276(makes)S
2558(sense)S
2801(with)S
10 I
3005(u)S
10 R
3080(and)S
10 I
3250(g)S
10 R
3300(;)S
3353(o+s)S
3524(is)S
3616(harmless.)S
5352 V
9 R
720(S)S
722(SE)S
774(EE)S
832(E)S
913(A)S
915(AL)S
983(LS)S
1041(SO)S
1093(O)S
5472 V
10 B
1080(ls)S
10 R
1147(\(1\),)S
10 B
1315(chmod)S
10 R
1606(\(2\).)S
7903 V
720(Page)S
941(1)S
4455(September)S
4911(13,)S
(1996)200 5061 A
8143 V
EP
%%Trailer
%%DocumentFonts: Times-Roman Times-Bold Times-Italic
%%Pages: 1