Perl で作る tiny shell

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1FSMͰ࡞Δ  UJOZTIFMM )PLLBJEPQN

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!DPEFIFY !$PEF)FY w .FSDBSJ *OD w %FWFMPQJOHNJDSPTFSWJDFT w 0LJOBXBQN w *MJLF1FSM94(P w IUUQTDPEFIFYIBUFCMPKQ

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γΣϧͬͯ஌ͬͯ·͔͢

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No content

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$ pwd 

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$ pwd  /Users/codehex

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#BTI ;TI pTI

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γΣϧʹ͸  ༷ʑͳػೳ͕͋Γ·͢

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ྫ͑͹

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ύΠϓ

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$ pwd | cat -n 

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$ pwd | cat -n  1 /Users/codehex

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Ξϯυ

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$ pwd && echo hello 

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$ pwd && echo hello  /Users/codehex  hello

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͜ΕΒͷ  ࣮૷Λ஌͍ͬͯ·͔͢ʁ

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ࠓ೔࿩͢಺༰

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ࠓ೔࿩͢಺༰ w ࠷௿ݶͷγΣϧͷఆٛ w ߏจղੳ w ίϚϯυͷ࣮ߦ

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ࠓ೔࿩͢಺༰ w ࠷௿ݶͷγΣϧͷఆٛ w ߏจղੳ w ίϚϯυͷ࣮ߦ

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࠷௿ݶͷγΣϧͷఆٛ UJOZTIFMMͷಈ࡞Λఆٛ͢Δ

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lUJOZTIFMMzNFBOT  ΊͬͪΌখ͍͞γΣϧ

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Ͳ͏͍͏ಈ࡞Λ͢Δ͔

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Ͳ͏͍͏ಈ࡞Λ͢Δ͔ w ୯ҰίϚϯυͷ࣮ߦ $ ls w ύΠϓͷ࣮ߦ $ ls | cat w ΞϯυʹΑΔෳ਺࣮ߦ $ ls && cat w αϒγΣϧ΍όοΫάϥϯυ࣮ߦ͸ࠓճؚΊ·ͤΜ

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ࠓ೔࿩͢಺༰ w ࠷௿ݶͷγΣϧͷఆٛ w ߏจղੳ w ίϚϯυͷ࣮ߦ

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ߏจղੳ ެจఆٛͱߏจղੳثͷ࡞੒

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$ cat | cat -n && ls

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$ cat | cat -n && ls

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$ cat | cat -n && ls

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$ cat | cat -n && ls

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$ cat | cat -n && ls

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$ cat | cat -n && ls ࠨ͔Βӈʹղऍ͠·͢

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ߏจͷఆٛ

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ӈʹ࿈͍݁ͯ͘͠Α͏ʹ  ఆٛ෇͚Λߦ͏

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ߏจղੳثͷ࡞੒

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ߏจղੳثʹඞཁͳཁૉ

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ߏจղੳثʹඞཁͳཁૉ w จࣈྻͷεΩϟφʔ w ಡΈࠐΈҐஔ΍ಡΈऔͬͨจࣈྻΛอ࣋͢Δ w จࣈྻͷϚονϯά w εΩϟφʔͰಘͨจࣈྻ͕ߏจఆٛʹϚονͨ͠ ͔Ͳ͏͔൑ผ͢Δ w Ϛονͨ͠จࣈྻʹҙຯΛ΋ͨͤΔ τʔΫϯԽ w ߏจ໦ͷੜ੒

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1FSMͰ͸ʁ

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ਖ਼نදݱ

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IUUQTQFSMEPDQFSMPSHQFSMPQIUNMD(@BTTFSUJPO@ l"VTFGVMJEJPNGPSAlexAMJLF  TDBOOFSTJTA/\G…/gcAʜz

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/\G…/gc

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/\G…/gc w A/cANPEJpFSͰ͸ݱࡏϚον͍ͯ͠ΔҐஔΛ  อ࣋͢Δ͜ͱ͕Ͱ͖Δɻ • pos()ͰҐஔΛऔΓग़͢͜ͱ͕Մೳ • \GͰલճAm//gAͰϚονͨ͠ҐஔΛอ࣋͢Δ͜ͱ ͕Մೳ

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εΩϟφʔͱϚονϯάͷ  ໾ׂΛ΋ͭ͜ͱ͕Ͱ͖Δ ?P? W

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͜͜Ͱྑ͍৘ใ

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ΊͬͪΌࢀߟʹͳΔϖʔδ w IUUQTHJUIVCDPNLBSVQBOFSVSBQ +40/CMPCNBTUFSMJC+40/1BSTFSQN w IUUQTHJUIVCDPNLBSVQBOFSVSB50.- 1BSTFSCMPCNBTUFSMJC50.-1BSTFSQN

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࣮૷༷ࢠ

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$.%

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4)--

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1*1&

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"/%

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໦ΛQSJOU༷ͨ͠ࢠ $ cat | cat -n && ls

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"/% 1*1& DBU DBU MT $ cat | cat -n && ls

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ͪͳΈʹ

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$ cat | cat -n && ls

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$ cat | cat -n && ls ࠨ͔Βӈʹղऍ͠·͢

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ͳͷͰ  ໦ΛḷΔͱ͖͸

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"/% 1*1& DBU DBU MT $ cat | cat -n && ls ᶃ

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"/% 1*1& DBU DBU MT $ cat | cat -n && ls ᶃ ᶄ ᶅ

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"/% 1*1& DBU DBU MT $ cat | cat -n && ls ᶃ ᶄ ᶅ ᶆ ᶇ

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͜ΕΛجʹ  ࣮ߦ͢ΔػೳΛ࡞੒͠·͢

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ࠓ೔࿩͢಺༰ w ࠷௿ݶͷγΣϧͷఆٛ w ߏจղੳ w ίϚϯυͷ࣮ߦ

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ίϚϯυͷ࣮ߦ ߏจ໦Λجʹ࣮ߦ͢Δ

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࣮૷ͷલʹ

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ඪ४ετϦʔϜʹ͍ͭͯ

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w 45%*/ 4UBOEBSE*OQVU ඪ४ೖྗ w 45%065 4UBOEBSE0VUQVU ඪ४ग़ྗ w 45%&33 4UBOEBSE&SSPS ඪ४Τϥʔग़ྗ ඪ४ετϦʔϜ

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͜ΕΒ͸࣮࣭  ϑΝΠϧͱͯ͠ѻΘΕ·͢

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୯ҰίϚϯυͷ  ετϦʔϜͷϑϩʔ

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$ cat

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$ cat cat 45%*/

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$ cat cat 45%*/ 45%065 45%&33

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$ cat GPSLΛ࢖͏ͱTIΛհ͞ͳ͍Ͱ࣮ߦՄೳ

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ύΠϓͷϑϩʔ

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$ fortune | cowsay

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$ fortune | cowsay 45%*/ PS/PU ᶃ

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$ fortune | cowsay 45%*/ PS/PU 45%065 ᶃ ᶄ

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$ fortune | cowsay 45%*/ PS/PU 45%065 45%*/ ᶃ ᶄ ᶅ

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$ fortune | cowsay 45%*/ PS/PU 45%065 45%*/ 45%065 ᶃ ᶄ ᶅ ᶆ

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͜ΕΒͷίϚϯυ͸  ผϓϩηεͰಈ͍͍ͯ·͢

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$ ps a | cat 1*%

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ύΠϓͷ࣮૷

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pipe my ($r, $w);

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w $r͕3FBEFS $w͕8SJUFS w 8SJUFSʹσʔλ͕ॻ͖ࠐ·Εͨͱ͖  3FBEFSͰͦͷσʔλΛಡΈऔΔ͜ͱ͕Մೳ pipe my ($r, $w);

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֤ϓϩηεؒͷετϦʔϜΛ  pipe()Ͱܨ͛Δ͜ͱͰ࣮૷Մೳ

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ͦͷ࣌ͷϑϩʔ

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$ fortune | cowsay 45%*/ PS/PU 45%065 ᶃ ᶄ

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$ fortune | cowsay 45%*/ PS/PU 45%065 ᶃ ᶄ ᶅ ᶆ 8SJUFS 3FBEFS

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$ fortune | cowsay 45%*/ PS/PU 45%065 45%*/ 45%065 ᶃ ᶄ ᶅ ᶆ 8SJUFS 3FBEFS ᶇ ᶈ ᶉ

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ͳͷͰ࣮࣭  ͜ͷΑ͏ʹߟ͑ΒΕΔ

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$ fortune | cowsay 45%*/ PS/PU 8SJUFS 3FBEFS 45%065 ᶃ ᶄ ᶅ ᶆ

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No content

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w ίϚϯυOPEFͰ͔ͭ਌OPEF͕ύΠϓͰ͸ͳ͍  ৔߹͸ଈίϚϯυΛ࣮ߦ w ͦΕҎ֎͸ίϚϯυΛอ࣋͢Δ w ύΠϓOPEF͔ͭ਌͕ύΠϓOPEFͰ͸ͳ͍৔߹  อ࣋͠ଓ͚ͨίϚϯυΛ࣮ߦ

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Ξϯυͷϑϩʔ

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$ echo hello && echo world

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$ echo hello && echo world ᶃ

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$ echo hello && echo world ᶃ ᶄ

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w ΞϯυOPEFʹདྷΔ·ͰʹࠨͷOPEFΛ  શ࣮ͯߦ͢Δ w ੒ޭͨ͠৔߹ӈͷOPEFΛࠨͷOPEFͱಉ͡Α͏ ʹ࣮ߦ͢Δ

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͜Ε͚ͩͰ  UJOZTIFMM͕׬੒͠·͢ʂ

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·ͱΊ

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·ͱΊ w ӈʹ࿈͍݁ͯ͘͠Α͏ʹߏจఆٛͨ͠ w γΣϧͷύΠϓɺΞϯυػೳΛཧղͯ͠ɺղੳ࣌ʹ ࣮ߦ͢ΔػೳΛ࡞੒ͨ͠

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࣭໰Ͳ͏ͧ https://github.com/Code-Hex/p5-Shell-Tiny