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|00000000| 53 75 62 6a 65 63 74 3a | 20 20 76 30 37 69 30 38 |Subject:|  v07i08|
|00000010| 39 3a 20 20 41 20 73 69 | 6d 70 6c 65 20 42 53 44 |9:  A si|mple BSD|
|00000020| 20 69 64 6c 65 2d 75 73 | 65 72 73 20 64 61 65 6d | idle-us|ers daem|
|00000030| 6f 6e 0a 4e 65 77 73 67 | 72 6f 75 70 73 3a 20 6d |on.Newsg|roups: m|
|00000040| 6f 64 2e 73 6f 75 72 63 | 65 73 0a 41 70 70 72 6f |od.sourc|es.Appro|
|00000050| 76 65 64 3a 20 6d 69 72 | 72 6f 72 21 72 73 0a 0a |ved: mir|ror!rs..|
|00000060| 53 75 62 6d 69 74 74 65 | 64 20 62 79 3a 20 73 65 |Submitte|d by: se|
|00000070| 69 73 6d 6f 21 65 72 69 | 78 21 6d 69 6b 65 20 28 |ismo!eri|x!mike (|
|00000080| 4d 69 6b 65 20 57 69 6c | 6c 69 61 6d 73 29 0a 4d |Mike Wil|liams).M|
|00000090| 6f 64 2e 73 6f 75 72 63 | 65 73 3a 20 56 6f 6c 75 |od.sourc|es: Volu|
|000000a0| 6d 65 20 37 2c 20 49 73 | 73 75 65 20 38 39 0a 41 |me 7, Is|sue 89.A|
|000000b0| 72 63 68 69 76 65 2d 6e | 61 6d 65 3a 20 69 64 6c |rchive-n|ame: idl|
|000000c0| 65 2e 75 73 65 72 73 0a | 0a 44 65 61 72 20 4d 6f |e.users.|.Dear Mo|
|000000d0| 64 65 72 61 74 6f 72 2c | 0a 0a 50 6c 65 61 73 65 |derator,|..Please|
|000000e0| 20 66 69 6e 64 20 77 69 | 74 68 69 6e 20 74 68 65 | find wi|thin the|
|000000f0| 20 73 6f 75 72 63 65 20 | 63 6f 64 65 20 66 6f 72 | source |code for|
|00000100| 20 61 20 64 61 65 6d 6f | 6e 20 49 20 68 61 76 65 | a daemo|n I have|
|00000110| 20 62 65 65 6e 20 72 75 | 6e 6e 69 6e 67 20 66 6f | been ru|nning fo|
|00000120| 72 0a 6d 6f 72 65 20 74 | 68 61 6e 20 36 20 6d 6f |r.more t|han 6 mo|
|00000130| 6e 74 68 73 20 77 69 74 | 68 6f 75 74 20 70 72 6f |nths wit|hout pro|
|00000140| 62 6c 65 6d 73 20 6f 6e | 20 6f 75 72 20 34 2e 32 |blems on| our 4.2|
|00000150| 42 53 44 20 73 79 73 74 | 65 6d 2e 20 49 74 20 73 |BSD syst|em. It s|
|00000160| 69 6d 70 6c 79 0a 6c 6f | 67 73 20 6f 66 66 20 69 |imply.lo|gs off i|
|00000170| 64 6c 65 20 75 73 65 72 | 73 20 61 66 65 72 20 67 |dle user|s afer g|
|00000180| 69 76 69 6e 67 20 74 68 | 65 6d 20 66 61 69 72 20 |iving th|em fair |
|00000190| 77 61 72 6e 69 6e 67 2e | 20 53 65 65 20 63 6f 6d |warning.| See com|
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|000001b0| 72 74 20 6f 66 20 74 68 | 65 20 63 6f 64 65 20 66 |rt of th|e code f|
|000001c0| 6f 72 20 6d 6f 72 65 20 | 64 65 74 61 69 6c 73 2e |or more |details.|
|000001d0| 0a 0a 49 20 77 72 6f 74 | 65 20 74 68 69 73 20 74 |..I wrot|e this t|
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|000001f0| 69 63 65 64 20 74 68 65 | 20 73 6f 6d 65 20 75 73 |iced the| some us|
|00000200| 65 72 73 20 6e 65 76 65 | 72 20 6c 6f 67 67 65 64 |ers neve|r logged|
|00000210| 20 6f 66 66 2e 20 20 49 | 0a 68 61 76 65 20 73 65 | off.  I|.have se|
|00000220| 65 6e 20 73 69 6d 69 6c | 61 72 20 74 68 69 6e 67 |en simil|ar thing|
|00000230| 73 20 6f 6e 20 74 68 65 | 20 6e 65 74 20 62 65 66 |s on the| net bef|
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|00000250| 6c 20 73 65 65 6d 65 64 | 20 72 61 74 68 65 72 0a |l seemed| rather.|
|00000260| 63 6f 6d 70 6c 69 63 61 | 74 65 64 2c 20 77 68 65 |complica|ted, whe|
|00000270| 72 65 61 73 20 74 68 69 | 73 20 74 68 69 6e 67 20 |reas thi|s thing |
|00000280| 69 73 20 76 65 72 79 20 | 73 69 6d 70 6c 65 20 61 |is very |simple a|
|00000290| 6e 64 20 65 61 73 79 20 | 74 6f 20 75 73 65 20 61 |nd easy |to use a|
|000002a0| 6e 64 0a 63 6f 6e 66 69 | 67 75 72 65 2e 20 20 4d |nd.confi|gure.  M|
|000002b0| 61 79 62 65 20 74 68 65 | 20 63 6f 6e 66 69 67 20 |aybe the| config |
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|00000300| 20 74 68 65 20 74 68 69 | 6e 67 20 69 73 20 73 6f | the thi|ng is so|
|00000310| 20 73 65 6c 64 6f 6d 20 | 72 65 63 6f 6e 66 69 67 | seldom |reconfig|
|00000320| 75 72 65 64 20 74 68 61 | 74 20 74 68 69 73 0a 73 |ured tha|t this.s|
|00000330| 65 65 6d 65 64 20 75 6e | 65 63 65 73 73 61 72 79 |eemed un|ecessary|
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|00000360| 62 6f 75 74 20 74 68 69 | 73 20 62 65 69 6e 67 20 |bout thi|s being |
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|00000380| 63 2c 20 62 75 74 20 6f | 66 20 63 6f 75 72 73 65 |c, but o|f course|
|00000390| 20 61 6e 79 6f 6e 65 20 | 63 61 6e 20 75 73 65 20 | anyone |can use |
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|000003d0| 65 64 2e 0a 0a 4d 69 6b | 65 20 57 69 6c 6c 69 61 |ed...Mik|e Willia|
|000003e0| 6d 73 20 28 6d 69 6b 65 | 40 65 72 69 78 2e 55 55 |ms (mike|@erix.UU|
|000003f0| 43 50 20 6f 72 20 2e 2e | 2e 6d 63 76 61 78 21 65 |CP or ..|.mcvax!e|
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|00000410| 23 21 20 2f 62 69 6e 2f | 73 68 0a 23 20 54 68 69 |#! /bin/|sh.# Thi|
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|00000440| 79 74 68 69 6e 67 20 62 | 65 66 6f 72 65 20 74 68 |ything b|efore th|
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|00000460| 75 6e 70 61 63 6b 20 69 | 74 20 62 79 20 73 61 76 |unpack i|t by sav|
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|00000490| 66 69 6c 65 22 2e 0a 23 | 20 49 66 20 61 6c 6c 20 |file"..#| If all |
|000004a0| 67 6f 65 73 20 77 65 6c | 6c 2c 20 79 6f 75 20 77 |goes wel|l, you w|
|000004b0| 69 6c 6c 20 73 65 65 20 | 74 68 65 20 6d 65 73 73 |ill see |the mess|
|000004c0| 61 67 65 20 22 45 6e 64 | 20 6f 66 20 73 68 65 6c |age "End| of shel|
|000004d0| 6c 20 61 72 63 68 69 76 | 65 2e 22 0a 23 20 43 6f |l archiv|e.".# Co|
|000004e0| 6e 74 65 6e 74 73 3a 20 | 20 4d 61 6b 65 66 69 6c |ntents: | Makefil|
|000004f0| 65 20 69 64 65 6c 2e 63 | 0a 50 41 54 48 3d 2f 62 |e idel.c|.PATH=/b|
|00000500| 69 6e 3a 2f 75 73 72 2f | 62 69 6e 3a 2f 75 73 72 |in:/usr/|bin:/usr|
|00000510| 2f 75 63 62 3b 20 65 78 | 70 6f 72 74 20 50 41 54 |/ucb; ex|port PAT|
|00000520| 48 0a 65 63 68 6f 20 73 | 68 61 72 3a 20 65 78 74 |H.echo s|har: ext|
|00000530| 72 61 63 74 69 6e 67 20 | 22 27 4d 61 6b 65 66 69 |racting |"'Makefi|
|00000540| 6c 65 27 22 20 27 28 34 | 36 20 63 68 61 72 61 63 |le'" '(4|6 charac|
|00000550| 74 65 72 73 29 27 0a 69 | 66 20 74 65 73 74 20 2d |ters)'.i|f test -|
|00000560| 66 20 27 4d 61 6b 65 66 | 69 6c 65 27 20 3b 20 74 |f 'Makef|ile' ; t|
|00000570| 68 65 6e 20 0a 20 20 65 | 63 68 6f 20 73 68 61 72 |hen .  e|cho shar|
|00000580| 3a 20 77 69 6c 6c 20 6e | 6f 74 20 6f 76 65 72 2d |: will n|ot over-|
|00000590| 77 72 69 74 65 20 65 78 | 69 73 74 69 6e 67 20 66 |write ex|isting f|
|000005a0| 69 6c 65 20 22 27 4d 61 | 6b 65 66 69 6c 65 27 22 |ile "'Ma|kefile'"|
|000005b0| 0a 65 6c 73 65 0a 73 65 | 64 20 27 73 2f 5e 58 2f |.else.se|d 's/^X/|
|000005c0| 2f 27 20 3e 4d 61 6b 65 | 66 69 6c 65 20 3c 3c 27 |/' >Make|file <<'|
|000005d0| 40 2f 2f 45 2a 4f 2a 46 | 20 4d 61 6b 65 66 69 6c |@//E*O*F| Makefil|
|000005e0| 65 2f 2f 27 0a 58 0a 58 | 69 64 65 6c 3a 09 69 64 |e//'.X.X|idel:.id|
|000005f0| 65 6c 2e 63 0a 58 09 24 | 28 43 43 29 20 24 28 43 |el.c.X.$|(CC) $(C|
|00000600| 46 4c 41 47 53 29 20 2d | 6f 20 69 64 65 6c 20 69 |FLAGS) -|o idel i|
|00000610| 64 65 6c 2e 63 0a 40 2f | 2f 45 2a 4f 2a 46 20 4d |del.c.@/|/E*O*F M|
|00000620| 61 6b 65 66 69 6c 65 2f | 2f 0a 69 66 20 74 65 73 |akefile/|/.if tes|
|00000630| 74 20 34 36 20 2d 6e 65 | 20 22 60 77 63 20 2d 63 |t 46 -ne| "`wc -c|
|00000640| 20 3c 27 4d 61 6b 65 66 | 69 6c 65 27 60 22 3b 20 | <'Makef|ile'`"; |
|00000650| 74 68 65 6e 0a 20 20 20 | 20 65 63 68 6f 20 73 68 |then.   | echo sh|
|00000660| 61 72 3a 20 65 72 72 6f | 72 20 74 72 61 6e 73 6d |ar: erro|r transm|
|00000670| 69 74 74 69 6e 67 20 22 | 27 4d 61 6b 65 66 69 6c |itting "|'Makefil|
|00000680| 65 27 22 20 27 28 73 68 | 6f 75 6c 64 20 68 61 76 |e'" '(sh|ould hav|
|00000690| 65 20 62 65 65 6e 20 34 | 36 20 63 68 61 72 61 63 |e been 4|6 charac|
|000006a0| 74 65 72 73 29 27 0a 66 | 69 0a 66 69 20 23 20 65 |ters)'.f|i.fi # e|
|000006b0| 6e 64 20 6f 66 20 6f 76 | 65 72 77 72 69 74 69 6e |nd of ov|erwritin|
|000006c0| 67 20 63 68 65 63 6b 0a | 65 63 68 6f 20 73 68 61 |g check.|echo sha|
|000006d0| 72 3a 20 65 78 74 72 61 | 63 74 69 6e 67 20 22 27 |r: extra|cting "'|
|000006e0| 69 64 65 6c 2e 63 27 22 | 20 27 28 35 34 34 38 20 |idel.c'"| '(5448 |
|000006f0| 63 68 61 72 61 63 74 65 | 72 73 29 27 0a 69 66 20 |characte|rs)'.if |
|00000700| 74 65 73 74 20 2d 66 20 | 27 69 64 65 6c 2e 63 27 |test -f |'idel.c'|
|00000710| 20 3b 20 74 68 65 6e 20 | 0a 20 20 65 63 68 6f 20 | ; then |.  echo |
|00000720| 73 68 61 72 3a 20 77 69 | 6c 6c 20 6e 6f 74 20 6f |shar: wi|ll not o|
|00000730| 76 65 72 2d 77 72 69 74 | 65 20 65 78 69 73 74 69 |ver-writ|e existi|
|00000740| 6e 67 20 66 69 6c 65 20 | 22 27 69 64 65 6c 2e 63 |ng file |"'idel.c|
|00000750| 27 22 0a 65 6c 73 65 0a | 73 65 64 20 27 73 2f 5e |'".else.|sed 's/^|
|00000760| 58 2f 2f 27 20 3e 69 64 | 65 6c 2e 63 20 3c 3c 27 |X//' >id|el.c <<'|
|00000770| 40 2f 2f 45 2a 4f 2a 46 | 20 69 64 65 6c 2e 63 2f |@//E*O*F| idel.c/|
|00000780| 2f 27 0a 58 2f 2a 20 69 | 64 6c 65 73 20 64 65 61 |/'.X/* i|dles dea|
|00000790| 6d 6f 6e 20 2d 20 6b 69 | 6c 6c 73 20 6f 66 66 20 |mon - ki|lls off |
|000007a0| 75 73 65 72 73 20 77 68 | 6f 20 68 61 76 65 20 6e |users wh|o have n|
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|000007c0| 72 6d 69 6e 61 6c 73 20 | 66 6f 72 0a 58 20 2a 20 |rminals |for.X * |
|000007d0| 61 20 73 70 65 63 69 66 | 69 65 64 20 74 69 6d 65 |a specif|ied time|
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|000007f0| 20 72 75 6e 20 66 6f 72 | 20 36 20 6d 6f 6e 74 68 | run for| 6 month|
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|00000940| 27 20 69 64 6c 65 27 09 | 3e 2f 64 65 76 2f 63 6f |' idle'.|>/dev/co|
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|00000b50| 73 79 73 6c 6f 67 0a 58 | 20 2a 20 4c 4f 47 5f 49 |syslog.X| * LOG_I|
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|00000b70| 64 65 66 65 6e 64 69 6e | 67 20 73 79 73 74 65 6d |defendin|g system|
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|00000cd0| 20 55 54 4d 50 20 22 2f | 65 74 63 2f 75 74 6d 70 | UTMP "/|etc/utmp|
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|00001ab0| 09 09 09 2f 2a 20 74 6f | 67 67 6c 65 20 63 62 72 |.../* to|ggle cbr|
|00001ac0| 65 61 6b 20 74 6f 20 64 | 69 73 72 75 70 74 20 61 |eak to d|isrupt a|
|00001ad0| 6e 79 20 74 65 72 6d 69 | 6e 61 6c 20 70 61 67 69 |ny termi|nal pagi|
|00001ae0| 6e 67 20 2a 2f 0a 58 09 | 09 09 28 76 6f 69 64 29 |ng */.X.|..(void)|
|00001af0| 20 69 6f 63 74 6c 28 74 | 66 64 2c 20 54 49 4f 43 | ioctl(t|fd, TIOC|
|00001b00| 47 45 54 50 2c 20 26 74 | 74 79 62 29 3b 0a 58 09 |GETP, &t|tyb);.X.|
|00001b10| 09 09 74 74 79 62 2e 73 | 67 5f 66 6c 61 67 73 20 |..ttyb.s|g_flags |
|00001b20| 5e 3d 20 43 42 52 45 41 | 4b 3b 0a 58 09 09 09 28 |^= CBREA|K;.X...(|
|00001b30| 76 6f 69 64 29 20 69 6f | 63 74 6c 28 74 66 64 2c |void) io|ctl(tfd,|
|00001b40| 20 54 49 4f 43 53 45 54 | 50 2c 20 26 74 74 79 62 | TIOCSET|P, &ttyb|
|00001b50| 29 3b 0a 58 09 09 09 74 | 74 79 62 2e 73 67 5f 66 |);.X...t|tyb.sg_f|
|00001b60| 6c 61 67 73 20 5e 3d 20 | 43 42 52 45 41 4b 3b 0a |lags ^= |CBREAK;.|
|00001b70| 58 09 09 09 28 76 6f 69 | 64 29 20 69 6f 63 74 6c |X...(voi|d) ioctl|
|00001b80| 28 74 66 64 2c 20 54 49 | 4f 43 53 45 54 50 2c 20 |(tfd, TI|OCSETP, |
|00001b90| 26 74 74 79 62 29 3b 0a | 58 09 09 09 0a 58 09 09 |&ttyb);.|X....X..|
|00001ba0| 09 2f 2a 20 77 72 69 74 | 65 20 6f 75 74 20 74 68 |./* writ|e out th|
|00001bb0| 65 20 6c 6f 67 6f 75 74 | 20 6d 65 73 73 61 67 65 |e logout| message|
|00001bc0| 20 2a 2f 0a 58 09 09 09 | 77 72 69 74 65 28 74 66 | */.X...|write(tf|
|00001bd0| 64 2c 20 6d 65 73 73 61 | 67 65 2c 20 73 74 72 6c |d, messa|ge, strl|
|00001be0| 65 6e 28 6d 65 73 73 61 | 67 65 29 29 3b 0a 58 09 |en(messa|ge));.X.|
|00001bf0| 09 0a 58 09 09 09 2f 2a | 20 66 6c 75 73 68 20 69 |..X.../*| flush i|
|00001c00| 74 20 6f 75 74 20 66 6f | 72 20 73 61 66 65 74 79 |t out fo|r safety|
|00001c10| 27 73 20 73 61 6b 65 20 | 2a 2f 0a 58 09 09 09 28 |'s sake |*/.X...(|
|00001c20| 76 6f 69 64 29 20 69 6f | 63 74 6c 28 74 66 64 2c |void) io|ctl(tfd,|
|00001c30| 20 54 49 4f 43 46 4c 55 | 53 48 2c 20 28 63 68 61 | TIOCFLU|SH, (cha|
|00001c40| 72 20 2a 29 30 29 3b 0a | 58 09 09 7d 0a 58 09 09 |r *)0);.|X..}.X..|
|00001c50| 61 6c 61 72 6d 28 30 29 | 3b 0a 58 09 09 28 76 6f |alarm(0)|;.X..(vo|
|00001c60| 69 64 29 20 63 6c 6f 73 | 65 28 74 66 64 29 3b 0a |id) clos|e(tfd);.|
|00001c70| 58 09 09 2f 2a 20 6b 69 | 6c 6c 20 6f 66 66 20 74 |X../* ki|ll off t|
|00001c80| 68 65 20 6f 66 66 65 6e | 64 65 72 27 73 20 6c 6f |he offen|der's lo|
|00001c90| 67 69 6e 20 61 6e 64 20 | 65 78 69 74 20 2a 2f 0a |gin and |exit */.|
|00001ca0| 58 09 09 69 66 20 28 21 | 77 61 72 6e 29 20 76 68 |X..if (!|warn) vh|
|00001cb0| 61 6e 67 75 70 28 29 3b | 0a 58 09 09 65 78 69 74 |angup();|.X..exit|
|00001cc0| 28 30 29 3b 0a 58 09 7d | 0a 58 09 2f 2a 70 61 72 |(0);.X.}|.X./*par|
|00001cd0| 65 6e 74 3a 20 77 61 69 | 74 20 66 6f 72 20 74 68 |ent: wai|t for th|
|00001ce0| 65 20 66 6f 72 6b 65 64 | 20 70 72 6f 63 65 73 73 |e forked| process|
|00001cf0| 2a 2f 0a 58 09 77 68 69 | 6c 65 20 28 77 61 69 74 |*/.X.whi|le (wait|
|00001d00| 28 30 29 20 3d 3d 20 30 | 29 3b 0a 58 7d 0a 58 0a |(0) == 0|);.X}.X.|
|00001d10| 58 2f 2a 20 6a 75 73 74 | 20 6c 6f 6e 67 6a 6d 70 |X/* just| longjmp|
|00001d20| 20 6f 75 74 20 69 66 20 | 74 69 6d 65 64 20 6f 75 | out if |timed ou|
|00001d30| 74 20 28 53 49 47 41 4c | 52 4d 20 72 65 63 65 69 |t (SIGAL|RM recei|
|00001d40| 76 65 64 29 20 2a 2f 0a | 58 61 6c 6c 61 72 6d 65 |ved) */.|Xallarme|
|00001d50| 64 28 73 69 67 29 0a 58 | 69 6e 74 20 73 69 67 3b |d(sig).X|int sig;|
|00001d60| 0a 58 7b 0a 58 6c 6f 6e | 67 6a 6d 70 28 65 6e 76 |.X{.Xlon|gjmp(env|
|00001d70| 2c 31 29 3b 0a 58 7d 0a | 58 0a 40 2f 2f 45 2a 4f |,1);.X}.|X.@//E*O|
|00001d80| 2a 46 20 69 64 65 6c 2e | 63 2f 2f 0a 69 66 20 74 |*F idel.|c//.if t|
|00001d90| 65 73 74 20 35 34 34 38 | 20 2d 6e 65 20 22 60 77 |est 5448| -ne "`w|
|00001da0| 63 20 2d 63 20 3c 27 69 | 64 65 6c 2e 63 27 60 22 |c -c <'i|del.c'`"|
|00001db0| 3b 20 74 68 65 6e 0a 20 | 20 20 20 65 63 68 6f 20 |; then. |   echo |
|00001dc0| 73 68 61 72 3a 20 65 72 | 72 6f 72 20 74 72 61 6e |shar: er|ror tran|
|00001dd0| 73 6d 69 74 74 69 6e 67 | 20 22 27 69 64 65 6c 2e |smitting| "'idel.|
|00001de0| 63 27 22 20 27 28 73 68 | 6f 75 6c 64 20 68 61 76 |c'" '(sh|ould hav|
|00001df0| 65 20 62 65 65 6e 20 35 | 34 34 38 20 63 68 61 72 |e been 5|448 char|
|00001e00| 61 63 74 65 72 73 29 27 | 0a 66 69 0a 66 69 20 23 |acters)'|.fi.fi #|
|00001e10| 20 65 6e 64 20 6f 66 20 | 6f 76 65 72 77 72 69 74 | end of |overwrit|
|00001e20| 69 6e 67 20 63 68 65 63 | 6b 0a 65 63 68 6f 20 73 |ing chec|k.echo s|
|00001e30| 68 61 72 3a 20 22 45 6e | 64 20 6f 66 20 73 68 65 |har: "En|d of she|
|00001e40| 6c 6c 20 61 72 63 68 69 | 76 65 2e 22 0a 65 78 69 |ll archi|ve.".exi|
|00001e50| 74 20 30 0a             |                         |t 0.    |        |
+--------+-------------------------+-------------------------+--------+--------+