{"id":75250,"date":"2020-03-24T19:42:19","date_gmt":"2020-03-24T17:42:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/obsuzhdenie-standartnye-unix-utility-kotorye-malo-kto-ispolzoval-i-ispolzuet-sejchas"},"modified":"2020-03-24T19:42:19","modified_gmt":"2020-03-24T17:42:19","slug":"obsuzhdenie-standartnye-unix-utility-kotorye-malo-kto-ispolzoval-i-ispolzuet-sejchas","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/administrirovanie\/obsuzhdenie-standartnye-unix-utility-kotorye-malo-kto-ispolzoval-i-ispolzuet-sejchas","title":{"rendered":"Discuss\u00e3o: utilit\u00e1rios UNIX padr\u00e3o que quase ningu\u00e9m usou e ainda usa hoje","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>H\u00e1 uma semana, Douglas McIlroy, desenvolvedor do pipeline UNIX e autor do conceito de \"programa\u00e7\u00e3o orientada a componentes\", <noindex><a rel=\"nofollow\" href=\"https:\/\/minnie.tuhs.org\/pipermail\/tuhs\/2020-March\/020664.html\">contou<\/a><\/noindex> sobre programas UNIX interessantes e incomuns que n\u00e3o obtiveram ampla aplica\u00e7\u00e3o. A publica\u00e7\u00e3o gerou uma discuss\u00e3o ativa no Hacker News. Coletamos o mais interessante e ficaremos felizes se voc\u00ea se juntar \u00e0 discuss\u00e3o.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/493718\/\"><img decoding=\"async\" alt=\"Discuss\u00e3o: utilit\u00e1rios UNIX padr\u00e3o que quase ningu\u00e9m usou e ainda usa hoje\" src=\"\/wp-content\/uploads\/2020\/03\/718c9fbcd3e2608b4079aa16e0ccf7f7.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<i>Foto \u2014 <noindex><a rel=\"nofollow\" href=\"https:\/\/unsplash.com\/photos\/QmNnZj_Ok-M\">Virginia Johnson<\/a><\/noindex> \u2014 Unsplash<\/i><\/p>\n<h2>Trabalhando com texto<\/h2>\n<p>\nNos sistemas operacionais similares ao UNIX, h\u00e1 um conjunto padr\u00e3o de ferramentas para formata\u00e7\u00e3o de texto. O utilit\u00e1rio <b><i>typo<\/i><\/b> permitia verificar o documento quanto a erros de digita\u00e7\u00e3o e <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%93%D0%B0%D0%BF%D0%B0%D0%BA%D1%81\">hapax legomena<\/a><\/noindex> \u2014 palavras que aparecem no material apenas uma vez. Curiosamente, para encontrar erros de digita\u00e7\u00e3o, o programa <noindex><a rel=\"nofollow\" href=\"http:\/\/man.cat-v.org\/unix-6th\/1\/typo\">n\u00e3o usa<\/a><\/noindex> dicion\u00e1rios. Ele se baseia apenas nas informa\u00e7\u00f5es do arquivo e realiza uma an\u00e1lise de frequ\u00eancia de trigramas (sequ\u00eancia de tr\u00eas caracteres). Enquanto isso, todos os contadores necess\u00e1rios <noindex><a rel=\"nofollow\" href=\"https:\/\/minnie.tuhs.org\/pipermail\/tuhs\/2020-March\/020664.html\">s\u00e3o armazenados<\/a><\/noindex> em um array 26x26x26. Segundo Douglas McIlroy, tal quantidade de mem\u00f3ria mal era suficiente para alguns contadores de um byte. Portanto, para economizar, eles eram escritos em formato logar\u00edtmico.<\/p>\n<p>Hoje, o typo foi substitu\u00eddo por programas de verifica\u00e7\u00e3o ortogr\u00e1fica mais modernos e precisos baseados em dicion\u00e1rios. No entanto, a ferramenta ainda \u00e9 lembrada \u2014 alguns anos atr\u00e1s, um entusiasta <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/robpike\/typo\">apresentou<\/a><\/noindex> implementou o typo em Go. O reposit\u00f3rio ainda est\u00e1 sendo atualizado.<\/p>\n<p>Outra ferramenta para trabalhar com documentos dos anos 80 \u00e9 o pacote <b><i>Banco de Trabalho do Escritor<\/i><\/b> de Lorinda Cherry e Nina McDonald, do Bell Labs. Ele inclu\u00eda <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Writer%27s_Workbench#Package_contents\">ferramentas para identifica\u00e7\u00e3o de partes do discurso e estilo do documento, pesquisa de tautologias e frases excessivamente complexas. As utilidades foram desenvolvidas como suporte para estudantes, e houve um tempo em que<\/a><\/noindex> os alunos da Colorado State University nos EUA. Mas no in\u00edcio dos anos 90, o Writer\u2019s Workbench foi esquecido, pois n\u00e3o foi inclu\u00eddo na Version 7 do Unix. No entanto, essa ferramenta continuou ao longo de suas imita\u00e7\u00f5es \u2014 por exemplo, <noindex><a rel=\"nofollow\" href=\"https:\/\/bit.ly\/2U9mSjT\">foram usados<\/a><\/noindex> alunos da Universidade Estadual do Colorado nos EUA. No entanto, no in\u00edcio dos anos noventa, o Banco de Trabalho do Escritor foi esquecido, pois n\u00e3o foi inclu\u00eddo na Vers\u00e3o 7 do Unix. No entanto, essa ferramenta continuou seu caminho atrav\u00e9s de imitadores \u2014 por exemplo, <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Grammatik\">para IBM PC.<\/a><\/noindex> No UNIX tamb\u00e9m existem ferramentas padr\u00e3o que simplificam o trabalho com f\u00f3rmulas. Existe um pr\u00e9-processador de linguagem para formatar express\u00f5es matem\u00e1ticas<\/p>\n<p>eqn <b><i>. Ele se destaca pelo fato de que, para exibir uma f\u00f3rmula, o desenvolvedor s\u00f3 precisa descrev\u00ea-la com palavras e s\u00edmbolos simples. Palavras-chave permitem deslocar os sinais matem\u00e1ticos vertical e horizontalmente, alterar seus tamanhos e outros par\u00e2metros. Se voc\u00ea passar para a utilidade uma string:<\/i><\/b>eqn<\/p>\n<pre><code class=\"bash\">soma de { k = 1 } a N { k sup 2 }<\/code><\/pre>\n<p>\nA seguinte f\u00f3rmula ser\u00e1 gerada:<\/p>\n<p><img decoding=\"async\" alt=\"Discuss\u00e3o: utilit\u00e1rios UNIX padr\u00e3o que quase ningu\u00e9m usou e ainda usa hoje\" src=\"\/wp-content\/uploads\/2020\/03\/afa0c33387f077ea8540be7961dd741d.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>\nNos anos 1980-1990 eqn <noindex><a rel=\"nofollow\" href=\"https:\/\/news.ycombinator.com\/item?id=22582548\">ajudou<\/a><\/noindex> especialistas em TI a escrever manuais de software. Mas depois foi substitu\u00eddo pelo sistema LaTeX, que <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/docs\/help\/posts\/#allowed_tags_formulae\">usa<\/a><\/noindex> at\u00e9 mesmo o Habr. Mas eqn \u00e9 a primeira ferramenta dessa classe, que ainda faz parte dos sistemas operacionais semelhantes ao UNIX.<\/p>\n<h2>Trabalhando com arquivos<\/h2>\n<p>\nNo t\u00f3pico relacionado, residentes do Hacker News mencionaram v\u00e1rias utilidades raramente usadas para trabalhar com arquivos. Uma delas <noindex><a rel=\"nofollow\" href=\"https:\/\/news.ycombinator.com\/item?id=22583046\">havia<\/a><\/noindex> <b><i>comm<\/i><\/b> para sua compara\u00e7\u00e3o. \u00c9 uma vers\u00e3o simplificada de <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Diff\">diff<\/a><\/noindex>, adaptada para uso em scripts. Sua <noindex><a rel=\"nofollow\" href=\"https:\/\/linux.die.net\/man\/1\/comm\">escreveu<\/a><\/noindex> pr\u00f3prio Richard Stallman (Richard Stallman) junto com David MacKenzie.<\/p>\n<p>A sa\u00edda do programa consiste em tr\u00eas colunas. A primeira coluna cont\u00e9m valores \u00fanicos do primeiro arquivo, a segunda \u2014 \u00fanicos do segundo arquivo. A terceira coluna inclui valores comuns. Para um funcionamento correto, os documentos comparados devem estar ordenados lexicalmente. Portanto, um dos residentes do espa\u00e7o <noindex><a rel=\"nofollow\" href=\"https:\/\/news.ycombinator.com\/item?id=22583686\">um patch escrito \u00e0 m\u00e3o para corre\u00e7\u00e3o.<\/a><\/noindex> trabalhar com a utilidade da seguinte forma:<\/p>\n<pre><code class=\"bash\">comm &lt;(sort fileA.txt) &lt;(sort fileB.txt)<\/code><\/pre>\n<p>\nO comando comm \u00e9 conveniente para verificar a grafia de palavras. Basta compar\u00e1-las com um documento de refer\u00eancia dicion\u00e1rio. Considerando as sutilezas relacionadas \u00e0 necessidade de ordenar arquivos, h\u00e1 <noindex><a rel=\"nofollow\" href=\"https:\/\/web.archive.org\/web\/20090402013730\/http:\/apicom.org.ua\/blog\/2009\/02\/16\/komanda-comm\/\">opini\u00e3o<\/a><\/noindex>, que Stallman e MacKenzie escreveram sua utilidade exclusivamente para este caso de uso.<\/p>\n<p><img decoding=\"async\" alt=\"Discuss\u00e3o: utilit\u00e1rios UNIX padr\u00e3o que quase ningu\u00e9m usou e ainda usa hoje\" src=\"\/wp-content\/uploads\/2020\/03\/ad90deb64ab4fd2215cd0c47299102eb.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Foto \u2014 <noindex><a rel=\"nofollow\" href=\"https:\/\/unsplash.com\/photos\/VB1XqDcp6sc\">Marnix Hogendoorn<\/a><\/noindex> \u2014 Unsplash<\/i><\/p>\n<p>Tamb\u00e9m participante da discuss\u00e3o no HN <noindex><a rel=\"nofollow\" href=\"https:\/\/news.ycombinator.com\/item?id=22583803\">observou<\/a><\/noindex> as funcionalidades do operador <i><b>paste<\/b><\/i>, que n\u00e3o eram \u00f3bvias para ele. Ele permite alternar fluxos de dados ou dividir um \u00fanico fluxo em duas colunas na sa\u00edda:<\/p>\n<pre><code class=\"bash\">$ paste &lt;( echo -e 'foonbar' ) &lt;( echo -e 'baznqux' )\nfoo     baz\nbar     qux\n$ echo -e 'foonbarnbaznqux' | paste - -\nfoo     bar\nbaz     qux\n<\/code><\/pre>\n<p>\nUm dos usu\u00e1rios <noindex><a rel=\"nofollow\" href=\"https:\/\/news.ycombinator.com\/item?id=22585103\">notou<\/a><\/noindex>, que muitas vezes, para realizar essas opera\u00e7\u00f5es simples, utilizam solu\u00e7\u00f5es n\u00e3o t\u00e3o otimizadas: come\u00e7ando com <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Fmt\">fmt<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Ex_(Unix)\">ex<\/a><\/noindex> e terminando com <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/johnkerl\/miller\">mlr<\/a><\/noindex> com <noindex><a rel=\"nofollow\" href=\"http:\/\/www.nsc.ru\/cgi-bin\/www\/unix_help\/unix-man?jot\">foi adicionada a capacidade de gerar um fluxo infinito de dados aleat\u00f3rios, respeitando os limites especificados;<\/a><\/noindex> e <noindex><a rel=\"nofollow\" href=\"https:\/\/www.freebsd.org\/cgi\/man.cgi?query=rs&amp;sektion=1&amp;apropos=0&amp;manpath=freebsd\">rs<\/a><\/noindex>.<\/p>\n<p><i>Quais funcionalidades padr\u00e3o dos sistemas operacionais semelhantes ao UNIX foram uma descoberta para voc\u00ea?<\/i><\/p>\n<blockquote><p><b>Sobre o que escrevemos em nosso blog corporativo:<\/b><\/p>\n<p><img decoding=\"async\" alt=\"Discuss\u00e3o: utilit\u00e1rios UNIX padr\u00e3o que quase ningu\u00e9m usou e ainda usa hoje\" src=\"\/wp-content\/uploads\/2020\/03\/db0656feed61e91b940671b37ab5f985.png\" style=\"display:block;margin: 0 auto;\" \/> <noindex><a rel=\"nofollow\" href=\"https:\/\/1cloud.ru\/blog\/era-arpanet?utm_source=habrahabr&amp;utm_medium=cpm&amp;utm_campaign=unixtools&amp;utm_content=blog\">Como evoluiu o sistema de nomes de dom\u00ednio: a era ARPANET<\/a><\/noindex><br \/>\n<img decoding=\"async\" alt=\"Discuss\u00e3o: utilit\u00e1rios UNIX padr\u00e3o que quase ningu\u00e9m usou e ainda usa hoje\" src=\"\/wp-content\/uploads\/2020\/03\/63e6e0e03ebc4a3e19021bc3b0d2056b.png\" style=\"display:block;margin: 0 auto;\" \/> <noindex><a rel=\"nofollow\" href=\"https:\/\/1cloud.ru\/blog\/pervie-dns-serveri?utm_source=habrahabr&amp;utm_medium=cpm&amp;utm_campaign=unixtools&amp;utm_content=blog\">Hist\u00f3ria do sistema de nomes de dom\u00ednio: primeiros servidores DNS<\/a><\/noindex><br \/>\n<img decoding=\"async\" alt=\"Discuss\u00e3o: utilit\u00e1rios UNIX padr\u00e3o que quase ningu\u00e9m usou e ainda usa hoje\" src=\"\/wp-content\/uploads\/2020\/03\/b6f82ebfbd4f15956665983a173f3918.png\" style=\"display:block;margin: 0 auto;\" \/> <noindex><a rel=\"nofollow\" href=\"https:\/\/1cloud.ru\/blog\/platnie-dns-imena?utm_source=habrahabr&amp;utm_medium=cpm&amp;utm_campaign=unixtools&amp;utm_content=blog\">A hist\u00f3ria do DNS: quando os nomes de dom\u00ednio se tornaram pagos<\/a><\/noindex><br \/>\n<img decoding=\"async\" alt=\"Discuss\u00e3o: utilit\u00e1rios UNIX padr\u00e3o que quase ningu\u00e9m usou e ainda usa hoje\" src=\"\/wp-content\/uploads\/2020\/03\/a275e20583822938ec87cf580228dce6.png\" style=\"display:block;margin: 0 auto;\" \/> <noindex><a rel=\"nofollow\" href=\"https:\/\/1cloud.ru\/blog\/voini-protokolov-dns?utm_source=habrahabr&amp;utm_medium=cpm&amp;utm_campaign=unixtools&amp;utm_content=blog\">A hist\u00f3ria do sistema de nomes de dom\u00ednio: as 'guerras' dos protocolos<\/a><\/noindex><\/p><\/blockquote>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/493718\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041d\u0435\u0434\u0435\u043b\u044e \u043d\u0430\u0437\u0430\u0434 \u0414\u0443\u0433\u043b\u0430\u0441 \u041c\u0430\u043a\u0438\u043b\u0440\u043e\u0439 (Douglas McIlroy), \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a \u043a\u043e\u043d\u0432\u0435\u0439\u0435\u0440\u0430 UNIX \u0438 \u0430\u0432\u0442\u043e\u0440 \u043f\u043e\u043d\u044f\u0442\u0438\u044f \u00ab\u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u043d\u043e-\u043e\u0440\u0438\u0435\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0435 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435\u00bb, \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u0430\u043b \u043e\u0431 \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u044b\u0445 \u0438 \u043d\u0435\u043e\u0431\u044b\u0447\u043d\u044b\u0445 UNIX-\u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0430\u0445, \u043d\u0435 \u043d\u0430\u0448\u0435\u0434\u0448\u0438\u0445 \u0448\u0438\u0440\u043e\u043a\u043e\u0433\u043e \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f. \u041f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u044f \u0437\u0430\u043f\u0443\u0441\u0442\u0438\u043b\u0430 \u0430\u043a\u0442\u0438\u0432\u043d\u043e\u0435 \u043e\u0431\u0441\u0443\u0436\u0434\u0435\u043d\u0438\u0435 \u043d\u0430 Hacker News. \u041c\u044b \u0441\u043e\u0431\u0440\u0430\u043b\u0438 \u0441\u0430\u043c\u043e\u0435 \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u043e\u0435 \u0438 \u0431\u0443\u0434\u0435\u043c \u0440\u0430\u0434\u044b, \u0435\u0441\u043b\u0438 \u0432\u044b \u043f\u0440\u0438\u0441\u043e\u0435\u0434\u0438\u043d\u0438\u0442\u0435\u0441\u044c \u043a \u0434\u0438\u0441\u043a\u0443\u0441\u0441\u0438\u0438. \u0424\u043e\u0442\u043e \u2014 Virginia Johnson \u2014 Unsplash \u0420\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0435\u043a\u0441\u0442\u043e\u043c \u0412 UNIX-\u043f\u043e\u0434\u043e\u0431\u043d\u044b\u0445 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u044b\u0445 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":75251,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-75250","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041d\u0435\u0434\u0435\u043b\u044e \u043d\u0430\u0437\u0430\u0434 \u0414\u0443\u0433\u043b\u0430\u0441 \u041c\u0430\u043a\u0438\u043b\u0440\u043e\u0439 (Douglas McIlroy), \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a \u043a\u043e\u043d\u0432\u0435\u0439\u0435\u0440\u0430 UNIX \u0438 \u0430\u0432\u0442\u043e\u0440 \u043f\u043e\u043d\u044f\u0442\u0438\u044f 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