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MacOS 8.1
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Win98
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DOS
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This file was processed as: Mailbox/MIME Entity
(archive/mbox).
Confidence | Program | Detection | Match Type | Support
|
---|
100%
| dexvert
| Mailbox/MIME Entity (archive/mbox)
| magic
| Supported |
100%
| dexvert
| Internet Message Format (text/imf)
| magic
| Supported |
1%
| dexvert
| Text File (text/txt)
| fallback
| Supported |
100%
| file
| Mailbox text, 1st line "From jsq@cs.utexas.edu Thu Oct 4 14:39:03 1990", ASCII text
| default
| |
100%
| TrID
| E-Mail message (Var. 2)
| default
| |
100%
| checkBytes
| Printable ASCII
| default
| |
100%
| perlTextCheck
| Likely Text (Perl)
| default
| |
100%
| siegfried
| x-fmt/111 Plain Text File
| default
| |
100%
| detectItEasy
| Format: plain text[LF]
| default (weak)
| |
100%
| xdgMime
| application/mbox
| default
|
|
hex view+--------+-------------------------+-------------------------+--------+--------+
|00000000| 46 72 6f 6d 20 6a 73 71 | 40 63 73 2e 75 74 65 78 |From jsq|@cs.utex|
|00000010| 61 73 2e 65 64 75 20 20 | 54 68 75 20 4f 63 74 20 |as.edu |Thu Oct |
|00000020| 20 34 20 31 34 3a 33 39 | 3a 30 33 20 31 39 39 30 | 4 14:39|:03 1990|
|00000030| 0a 52 65 63 65 69 76 65 | 64 3a 20 66 72 6f 6d 20 |.Receive|d: from |
|00000040| 63 73 2e 75 74 65 78 61 | 73 2e 65 64 75 20 62 79 |cs.utexa|s.edu by|
|00000050| 20 75 75 6e 65 74 2e 75 | 75 2e 6e 65 74 20 28 35 | uunet.u|u.net (5|
|00000060| 2e 36 31 2f 31 2e 31 34 | 29 20 77 69 74 68 20 53 |.61/1.14|) with S|
|00000070| 4d 54 50 20 0a 09 69 64 | 20 41 41 32 30 33 32 31 |MTP ..id| AA20321|
|00000080| 3b 20 54 68 75 2c 20 34 | 20 4f 63 74 20 39 30 20 |; Thu, 4| Oct 90 |
|00000090| 31 34 3a 33 39 3a 30 33 | 20 2d 30 34 30 30 0a 50 |14:39:03| -0400.P|
|000000a0| 6f 73 74 65 64 2d 44 61 | 74 65 3a 20 33 20 4f 63 |osted-Da|te: 3 Oc|
|000000b0| 74 20 39 30 20 32 30 3a | 34 39 3a 31 31 20 47 4d |t 90 20:|49:11 GM|
|000000c0| 54 0a 52 65 63 65 69 76 | 65 64 3a 20 62 79 20 63 |T.Receiv|ed: by c|
|000000d0| 73 2e 75 74 65 78 61 73 | 2e 65 64 75 20 28 35 2e |s.utexas|.edu (5.|
|000000e0| 36 34 2f 31 2e 37 37 29 | 20 0a 46 72 6f 6d 3a 20 |64/1.77)| .From: |
|000000f0| 62 72 6e 73 74 6e 64 40 | 6b 72 61 6d 64 65 6e 2e |brnstnd@|kramden.|
|00000100| 61 63 66 2e 6e 79 75 2e | 65 64 75 20 28 44 61 6e |acf.nyu.|edu (Dan|
|00000110| 20 42 65 72 6e 73 74 65 | 69 6e 29 0a 4e 65 77 73 | Bernste|in).News|
|00000120| 67 72 6f 75 70 73 3a 20 | 63 6f 6d 70 2e 73 74 64 |groups: |comp.std|
|00000130| 2e 75 6e 69 78 0a 53 75 | 62 6a 65 63 74 3a 20 52 |.unix.Su|bject: R|
|00000140| 65 3a 20 53 74 61 6e 64 | 61 72 64 73 20 55 70 64 |e: Stand|ards Upd|
|00000150| 61 74 65 2c 20 49 45 45 | 45 20 31 30 30 33 2e 34 |ate, IEE|E 1003.4|
|00000160| 3a 20 52 65 61 6c 2d 74 | 69 6d 65 20 45 78 74 65 |: Real-t|ime Exte|
|00000170| 6e 73 69 6f 6e 73 0a 4d | 65 73 73 61 67 65 2d 49 |nsions.M|essage-I|
|00000180| 64 3a 20 3c 31 33 31 39 | 35 40 63 73 2e 75 74 65 |d: <1319|5@cs.ute|
|00000190| 78 61 73 2e 65 64 75 3e | 0a 52 65 66 65 72 65 6e |xas.edu>|.Referen|
|000001a0| 63 65 73 3a 20 3c 35 32 | 39 40 75 73 65 6e 69 78 |ces: <52|9@usenix|
|000001b0| 2e 4f 52 47 3e 20 3c 35 | 34 38 40 75 73 65 6e 69 |.ORG> <5|48@useni|
|000001c0| 78 2e 4f 52 47 3e 20 3c | 31 30 36 36 39 37 40 75 |x.ORG> <|106697@u|
|000001d0| 75 6e 65 74 2e 55 55 2e | 4e 45 54 3e 0a 53 65 6e |unet.UU.|NET>.Sen|
|000001e0| 64 65 72 3a 20 6a 73 71 | 40 63 73 2e 75 74 65 78 |der: jsq|@cs.utex|
|000001f0| 61 73 2e 65 64 75 0a 4f | 72 67 61 6e 69 7a 61 74 |as.edu.O|rganizat|
|00000200| 69 6f 6e 3a 20 49 52 0a | 58 2d 53 75 62 6d 69 73 |ion: IR.|X-Submis|
|00000210| 73 69 6f 6e 73 3a 20 73 | 74 64 2d 75 6e 69 78 40 |sions: s|td-unix@|
|00000220| 75 75 6e 65 74 2e 75 75 | 2e 6e 65 74 0a 44 61 74 |uunet.uu|.net.Dat|
|00000230| 65 3a 20 33 20 4f 63 74 | 20 39 30 20 32 30 3a 34 |e: 3 Oct| 90 20:4|
|00000240| 39 3a 31 31 20 47 4d 54 | 0a 52 65 70 6c 79 2d 54 |9:11 GMT|.Reply-T|
|00000250| 6f 3a 20 73 74 64 2d 75 | 6e 69 78 40 75 75 6e 65 |o: std-u|nix@uune|
|00000260| 74 2e 75 75 2e 6e 65 74 | 0a 54 6f 3a 20 73 74 64 |t.uu.net|.To: std|
|00000270| 2d 75 6e 69 78 40 75 75 | 6e 65 74 2e 75 75 2e 6e |-unix@uu|net.uu.n|
|00000280| 65 74 0a 0a 53 75 62 6d | 69 74 74 65 64 2d 62 79 |et..Subm|itted-by|
|00000290| 3a 20 62 72 6e 73 74 6e | 64 40 6b 72 61 6d 64 65 |: brnstn|d@kramde|
|000002a0| 6e 2e 61 63 66 2e 6e 79 | 75 2e 65 64 75 20 28 44 |n.acf.ny|u.edu (D|
|000002b0| 61 6e 20 42 65 72 6e 73 | 74 65 69 6e 29 0a 0a 49 |an Berns|tein)..I|
|000002c0| 6e 20 61 72 74 69 63 6c | 65 20 3c 31 30 36 36 39 |n articl|e <10669|
|000002d0| 37 40 75 75 6e 65 74 2e | 55 55 2e 4e 45 54 3e 20 |7@uunet.|UU.NET> |
|000002e0| 70 65 74 65 72 40 66 69 | 63 63 2e 66 65 72 72 61 |peter@fi|cc.ferra|
|000002f0| 6e 74 69 2e 63 6f 6d 20 | 28 50 65 74 65 72 20 64 |nti.com |(Peter d|
|00000300| 61 20 53 69 6c 76 61 29 | 20 77 72 69 74 65 73 3a |a Silva)| writes:|
|00000310| 0a 20 20 5b 20 50 72 6f | 67 72 61 6d 73 20 64 65 |. [ Pro|grams de|
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|00000330| 77 6f 72 6b 69 6e 67 2e | 20 5d 0a 0a 4f 6e 20 74 |working.| ]..On t|
|00000340| 68 65 20 63 6f 6e 74 72 | 61 72 79 2e 20 57 68 65 |he contr|ary. Whe|
|00000350| 6e 20 74 68 65 20 64 65 | 73 63 72 69 70 74 6f 72 |n the de|scriptor|
|00000360| 20 69 73 20 75 6e 72 65 | 6c 69 61 62 6c 65 2c 20 | is unre|liable, |
|00000370| 79 6f 75 20 67 65 74 20 | 61 6e 20 49 2f 4f 0a 65 |you get |an I/O.e|
|00000380| 72 72 6f 72 20 6f 72 20 | 74 68 65 20 64 61 74 61 |rror or |the data|
|00000390| 20 69 73 20 73 69 6d 70 | 6c 79 20 63 6f 72 72 75 | is simp|ly corru|
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|000003d0| 2e 20 50 72 6f 67 72 61 | 6d 73 20 74 68 61 74 20 |. Progra|ms that |
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|000003f0| 20 72 65 61 64 28 29 20 | 61 6e 64 20 77 72 69 74 | read() |and writ|
|00000400| 65 28 29 20 61 72 65 20 | 6d 6f 72 65 0a 72 6f 62 |e() are |more.rob|
|00000410| 75 73 74 20 74 68 61 6e | 20 70 72 6f 67 72 61 6d |ust than| program|
|00000420| 73 20 74 68 61 74 20 64 | 6f 6e 27 74 2e 0a 0a 4d |s that d|on't...M|
|00000430| 6f 72 65 20 63 6f 6d 6d | 6f 6e 6c 79 2c 20 77 68 |ore comm|only, wh|
|00000440| 65 6e 20 74 68 65 20 64 | 65 73 63 72 69 70 74 6f |en the d|escripto|
|00000450| 72 20 69 73 20 64 79 6e | 61 6d 69 63 20 61 6e 64 |r is dyn|amic and|
|00000460| 20 74 68 65 20 6f 74 68 | 65 72 20 73 69 64 65 20 | the oth|er side |
|00000470| 64 72 6f 70 73 2c 0a 79 | 6f 75 20 67 65 74 20 61 |drops,.y|ou get a|
|00000480| 20 62 72 6f 6b 65 6e 20 | 70 69 70 65 2e 20 54 68 | broken |pipe. Th|
|00000490| 69 73 20 69 73 20 63 65 | 72 74 61 69 6e 6c 79 20 |is is ce|rtainly |
|000004a0| 6e 6f 74 20 61 20 72 61 | 72 65 20 66 61 69 6c 75 |not a ra|re failu|
|000004b0| 72 65 20 6d 6f 64 65 2e | 0a 0a 49 6e 20 63 6f 6e |re mode.|..In con|
|000004c0| 74 65 78 74 2c 20 49 20 | 73 61 69 64 20 74 68 61 |text, I |said tha|
|000004d0| 74 20 6f 70 65 6e 28 29 | 20 69 73 20 6f 6e 6c 79 |t open()| is only|
|000004e0| 20 61 70 70 72 6f 70 72 | 69 61 74 65 20 66 6f 72 | appropr|iate for|
|000004f0| 20 72 65 6c 69 61 62 6c | 65 2c 20 73 74 61 74 69 | reliabl|e, stati|
|00000500| 63 2c 0a 6c 6f 63 61 6c | 20 49 2f 4f 20 6f 62 6a |c,.local| I/O obj|
|00000510| 65 63 74 73 2e 20 59 6f | 75 20 73 65 65 6d 20 74 |ects. Yo|u seem t|
|00000520| 6f 20 62 65 20 61 72 67 | 75 69 6e 67 20 74 68 61 |o be arg|uing tha|
|00000530| 74 20 72 65 61 64 28 29 | 20 61 6e 64 20 77 72 69 |t read()| and wri|
|00000540| 74 65 28 29 2c 20 61 6e | 64 0a 66 69 6c 65 20 64 |te(), an|d.file d|
|00000550| 65 73 63 72 69 70 74 6f | 72 73 20 69 6e 20 67 65 |escripto|rs in ge|
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|00000570| 69 72 65 20 72 65 6c 69 | 61 62 6c 65 2c 20 73 74 |ire reli|able, st|
|00000580| 61 74 69 63 2c 20 6c 6f | 63 61 6c 20 49 2f 4f 0a |atic, lo|cal I/O.|
|00000590| 6f 62 6a 65 63 74 73 2c | 20 61 6e 64 20 73 6f 20 |objects,| and so |
|000005a0| 6d 79 20 64 69 73 74 69 | 6e 63 74 69 6f 6e 20 69 |my disti|nction i|
|000005b0| 73 20 73 69 6c 6c 79 2e | 20 42 75 74 20 55 44 50 |s silly.| But UDP|
|000005c0| 20 73 6f 63 6b 65 74 73 | 2c 20 70 69 70 65 73 2c | sockets|, pipes,|
|000005d0| 20 61 6e 64 20 54 43 50 | 0a 73 6f 63 6b 65 74 73 | and TCP|.sockets|
|000005e0| 20 61 72 65 20 75 6e 72 | 65 6c 69 61 62 6c 65 2c | are unr|eliable,|
|000005f0| 20 64 79 6e 61 6d 69 63 | 2c 20 61 6e 64 20 72 65 | dynamic|, and re|
|00000600| 6d 6f 74 65 20 66 69 6c | 65 20 64 65 73 63 72 69 |mote fil|e descri|
|00000610| 70 74 6f 72 73 0a 72 65 | 73 70 65 63 74 69 76 65 |ptors.re|spective|
|00000620| 6c 79 2c 20 61 6e 64 20 | 72 65 61 64 28 29 2f 77 |ly, and |read()/w|
|00000630| 72 69 74 65 28 29 20 77 | 6f 72 6b 20 77 69 74 68 |rite() w|ork with|
|00000640| 20 74 68 65 6d 20 70 65 | 72 66 65 63 74 6c 79 2e | them pe|rfectly.|
|00000650| 0a 0a 3e 20 3e 20 59 6f | 75 20 63 61 6e 20 72 65 |..> > Yo|u can re|
|00000660| 61 64 28 29 20 6f 72 0a | 3e 20 3e 20 77 72 69 74 |ad() or.|> > writ|
|00000670| 65 28 29 20 72 65 61 73 | 6f 6e 61 62 6c 65 20 49 |e() reas|onable I|
|00000680| 2f 4f 20 6f 62 6a 65 63 | 74 73 20 74 68 72 6f 75 |/O objec|ts throu|
|00000690| 67 68 20 66 69 6c 65 20 | 64 65 73 63 72 69 70 74 |gh file |descript|
|000006a0| 6f 72 73 2e 20 56 65 72 | 79 20 66 65 77 0a 3e 20 |ors. Ver|y few.> |
|000006b0| 3e 20 70 72 6f 67 72 61 | 6d 73 2d 2d 2d 74 68 65 |> progra|ms---the|
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|00000710| 73 65 20 66 69 6c 65 20 | 64 65 73 63 72 69 70 74 |se file |descript|
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|00000730| 73 20 74 68 65 20 70 72 | 6f 62 6c 65 6d 2c 20 62 |s the pr|oblem, b|
|00000740| 65 63 61 75 73 65 20 74 | 68 65 20 73 68 65 6c 6c |ecause t|he shell|
|00000750| 20 69 73 20 74 68 65 20 | 70 72 6f 67 72 61 6d 20 | is the |program |
|00000760| 74 68 61 74 20 69 73 20 | 75 73 65 64 20 74 6f 0a |that is |used to.|
|00000770| 3e 20 63 72 65 61 74 65 | 20 6d 6f 72 65 20 66 69 |> create| more fi|
|00000780| 6c 65 20 64 65 73 63 72 | 69 70 74 6f 72 73 20 74 |le descr|iptors t|
|00000790| 68 61 6e 20 6a 75 73 74 | 20 61 62 6f 75 74 20 61 |han just| about a|
|000007a0| 6e 79 74 68 69 6e 67 20 | 65 6c 73 65 2e 20 49 66 |nything |else. If|
|000007b0| 20 74 68 65 20 73 68 65 | 6c 6c 0a 3e 20 68 61 64 | the she|ll.> had|
|000007c0| 20 61 20 73 79 6e 74 61 | 78 20 66 6f 72 20 63 72 | a synta|x for cr|
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|000007e0| 6e 64 20 6e 65 74 77 6f | 72 6b 20 63 6f 6e 6e 65 |nd netwo|rk conne|
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|00000820| 2e 0a 0a 4f 68 3f 20 52 | 65 61 6c 6c 79 3f 20 49 |...Oh? R|eally? I|
|00000830| 20 68 61 76 65 20 61 20 | 73 79 6e 74 61 78 20 66 | have a |syntax f|
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|00000850| 65 74 73 20 61 6e 64 20 | 6e 65 74 77 6f 72 6b 20 |ets and |network |
|00000860| 63 6f 6e 6e 65 63 74 69 | 6f 6e 73 0a 66 72 6f 6d |connecti|ons.from|
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|000008b0| 20 63 74 63 70 20 75 75 | 6e 65 74 2e 75 75 2e 6e | ctcp uu|net.uu.n|
|000008c0| 65 74 20 73 6d 74 70 20 | 73 68 20 2d 63 20 27 65 |et smtp |sh -c 'e|
|000008d0| 63 68 6f 20 65 78 70 6e | 20 72 73 61 6c 7a 3e 26 |cho expn| rsalz>&|
|000008e0| 37 3b 65 63 68 6f 20 71 | 75 69 74 3e 26 37 3b 63 |7;echo q|uit>&7;c|
|000008f0| 61 74 3c 26 36 27 0a 0a | 53 6f 20 77 65 20 73 68 |at<&6'..|So we sh|
|00000900| 6f 75 6c 64 6e 27 74 20 | 62 65 20 68 61 76 69 6e |ouldn't |be havin|
|00000910| 67 20 74 68 69 73 20 64 | 69 73 63 75 73 73 69 6f |g this d|iscussio|
|00000920| 6e 2c 20 72 69 67 68 74 | 3f 0a 0a 3e 20 62 75 74 |n, right|?..> but|
|00000930| 20 74 68 65 6e 20 69 66 | 20 69 74 20 64 69 64 20 | then if| it did |
|00000940| 74 68 65 6e 20 79 6f 75 | 20 6d 69 67 68 74 20 61 |then you| might a|
|00000950| 73 20 77 65 6c 6c 20 6d | 61 6b 65 0a 3e 20 69 74 |s well m|ake.> it|
|00000960| 20 62 65 20 76 69 61 20 | 66 69 6c 65 6e 61 6d 65 | be via |filename|
|00000970| 73 2e 2e 2e 0a 0a 57 68 | 79 3f 20 49 20 64 6f 6e |s.....Wh|y? I don|
|00000980| 27 74 20 73 65 65 20 61 | 20 6e 61 74 75 72 61 6c |'t see a| natural|
|00000990| 20 66 69 6c 65 6e 61 6d | 65 20 73 79 6e 74 61 78 | filenam|e syntax|
|000009a0| 20 66 6f 72 20 54 43 50 | 20 63 6f 6e 6e 65 63 74 | for TCP| connect|
|000009b0| 69 6f 6e 73 2c 20 73 6f | 20 77 68 79 0a 73 68 6f |ions, so| why.sho|
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|00000a40| 64 65 72 73 74 61 6e 64 | 0a 74 68 65 20 66 69 6c |derstand|.the fil|
|00000a50| 65 6e 61 6d 65 73 2e 20 | 49 66 20 74 68 6f 73 65 |enames. |If those|
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|00000a90| 20 61 6e 64 20 73 65 6d | 20 61 72 65 20 72 65 6c | and sem| are rel|
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|00000ac0| 20 61 64 64 69 63 74 20 | 49 20 64 6f 6e 27 74 20 | addict |I don't |
|00000ad0| 68 61 76 65 20 6d 75 63 | 68 20 65 78 70 65 72 69 |have muc|h experi|
|00000ae0| 65 6e 63 65 20 77 69 74 | 68 20 74 68 6f 73 65 20 |ence wit|h those |
|00000af0| 66 65 61 74 75 72 65 73 | 2c 20 62 75 74 20 49 0a |features|, but I.|
|00000b00| 62 65 6c 69 65 76 65 20 | 79 6f 75 27 72 65 20 72 |believe |you're r|
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|00000b70| 49 27 6d 20 6e 6f 74 20 | 73 75 72 65 20 61 62 6f |I'm not |sure abo|
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|00000c00| 63 65 3f 0a 0a 2d 2d 2d | 44 61 6e 0a 0a 56 6f 6c |ce?..---|Dan..Vol|
|00000c10| 75 6d 65 2d 4e 75 6d 62 | 65 72 3a 20 56 6f 6c 75 |ume-Numb|er: Volu|
|00000c20| 6d 65 20 32 31 2c 20 4e | 75 6d 62 65 72 20 31 38 |me 21, N|umber 18|
|00000c30| 32 0a 0a | |2.. | |
+--------+-------------------------+-------------------------+--------+--------+