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Perl Quiz
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Shoichi Kaji
May 21, 2021
Programming
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140
Perl Quiz
Gotanda.pm 2021/05/21
Shoichi Kaji
May 21, 2021
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Transcript
Perl Quiz😆 Shoichi Kaji
Q1. ࣍ͷจষਖ਼͍͔͠? Time::Localύοέʔδʹ͓͍ͯ timelocalؔͰͳ͘ timelocal_modernؔΛ͏ ͜ͱ͕ਪ͞Ε͍ͯΔɻ
A1. ਖ਼͘͠ͳ͍
• timelocal جຊతʹ localtime ͷ"ٯ"Λఏڙ͢Δؔɻ Y,m,d,H,M,SΛड͚औΓunixtimeΛฦ͢ɻ • ͕ɺ"DWIM"ͳڍಈΛ͢Δ্ؔɺ 2020Λڥʹ݁Ռ͕มΘΔՄೳੑ͕͋Δ😨 •
͜ΕΛղܾ͘͢ɺܾఆతͳ݁ՌΛฦ͢ timelocal_modern͕༻ҙ͞Εͨɻ • ͕ɺͦΕগʑ͍·͍ͪͩͬͨͷͰɺݱࡏͰ timelocal_posixΛ͏͜ͱ͕ਪ͞Ε͍ͯΔɻ ͜Εlocaltimeͷਅͷ"ٯ"Λఏڙ͢Δɻ
Q2. ࣍ͷ ʹೖΔͷԿ͔? ֎෦ίϚϯυͷඪ४ग़ྗΛ ಘΔؔͱͯ͠ qx//, ``, ͕͋Δɻ
A2. readpipe
• rjbs͞ΜͷϒϩάಡΜͰ͍ͯɺ readpipeͱ͍͏͕ؔ͋Δ͜ͱΛ࠷ۙͬͨɻ • ಉ͡ಇ͖Λ͢ΔΈࠐΈ͕ؔ 3ͭ͋Δඞཁ...
Q3. PerlͰϋογϡϦϑΝϨϯεͱ ϒϩοΫʹಉ͡ه߸ {} Λ༻͍͍ͯΔɻ ͳΜΒ͔ͷཧ༝ͰϋογϡϦϑΝϨϯεΛ ໌͍ࣔͨ͠ͱ͖ +{} ͕ଟ༻͞ΕΔɻ ͰٯʹϒϩοΫΛ໌͍ࣔͨ͠ͱ͖
ͳΜͱॻ͘ͱΑ͍͔ʁ
A3. {; }
• metacpanΛோΊ͍ͯͨΒɺ App::UniϞδϡʔϧͰΘΕ͍ͯͯͬͨɻ • ࣮ࡍͷͱ͜Ζɺ+{}, {; } ຊʹඞཁͳॴগ ͳ͍ͱࢥ͏😇
Q4. Perl v5.16Ҏ্ʹ͓͍ͯ ࣮ߦϢʔβͷhomeσΟϨΫτϦ Λऔಘ͢Δ؆ศͳํ๏ʁ
A4. my $home = (<~>)[0];
• ΫϩεϓϥοτϑΥʔϜΛҙ্ࣝͨ͠Ͱ HomeσΟϨΫτϦΛऔಘ͢Δͷ݁ߏେมɻ • ͪΌΜͱΔͳΒFile::HomeDirϞδϡʔϧΛ͏ͷ͕ ΑΖ͍͠ɻ • "͋Δఔ"ͰेͳΒɺάϩϒ(glob,<>)Ͱ "~" Λ
ղܾͤͯ͞औಘ͢Δͷ͕ϥΫɻ • ͳ͓ɺPerl5.16ະຬҙ͍ࣝͨ͠ͳΒ File::HomeDir::TinyΛ͏ͱΑΖ͍͠ɻ
Q5. Perl͋ΔόʔδϣϯΑΓ @INCͷॱ൪͕มΘ͍ͬͯΔɻ มΘͬͨͷ࣍ͷ͏ͪͲΕ͔? (A) v5.10͔Β (B) v5.12͔Β (C) v5.14͔Β
A5. (B) v5.12͔Β
• @INCϞδϡʔϧαʔνύε͕ೖ͍ͬͯΔมɻ • @INCجຊతʹ * 1൪: CPANϞδϡʔϧೖΔsitelib * 2൪: coreϞδϡʔϧ͕ೖΔcorelib
ʹΑͬͯߏ͞ΕΔɻ • ͕ɺ5.10Ҏલcorelib, sitelibͷॱʹͳ͍ͬͯͨɻ • ͦͷ্ؔɺ5.10ҎલͰdual lifeϞδϡʔϧΛΠϯετʔϧ͢Δ ͱɺcorelibʹ্ॻ͖͞ΕΔɻ • CartonͷޙܧCarmel͕v5.12Λཁٻ͍ͯ͠Δͷ͜Ε͕ཁҼɻ
Q6. ҎԼͷίʔυΛWindowsͰ࣮ߦ͢Δͱ ʮHello, World!ʯ ͱදࣔ͞ΕΔɺ͞Εͳ͍?
A6. දࣔ͞Εͳ͍
• Windowsʹ͓͍ͯ ͨͱ͑ system LIST ܗࣜͰ͋ͬͯ ಛघจࣈΛΫΦʔτ͠ͳ͍ͱ͍͚ͳ͍Մೳੑ͕͋ Δɻ • ઌͷྫͩͱಛʹʮ"ʯ͕ͱͳͬͯ
ʮHello World!ʯͱදࣔ͞Εͳ͍ɻ • Windows༻ͷΫΦʔτʹɺWin32::ShellQuote ϞδϡʔϧΛ͏ͱΑ͍ɻ
͓ΘΓ