{"id":17568,"date":"2023-02-08T12:58:25","date_gmt":"2023-02-08T12:58:25","guid":{"rendered":"https:\/\/soloweb.com.br\/blog\/?p=17568"},"modified":"2023-04-02T12:50:58","modified_gmt":"2023-04-02T12:50:58","slug":"diferenca-entre-e-no-bash","status":"publish","type":"post","link":"https:\/\/soloweb.com.br\/blog\/2023\/02\/08\/diferenca-entre-e-no-bash\/","title":{"rendered":"Diferen\u00e7a entre ${} e $() no Bash"},"content":{"rendered":"\n<p>Os sistemas operacionais baseados em GNU, como&nbsp;<strong>o Linux<\/strong>, dependem de um interpretador de linguagem de comando ou shell chamado&nbsp;<strong>Bash<\/strong>&nbsp;para realizar a maioria de suas tarefas e objetivos de computa\u00e7\u00e3o.<\/p>\n\n\n\n<p>O autor por tr\u00e1s do&nbsp;<strong>Bash<\/strong>&nbsp;(&nbsp;<strong>Stephen Bourne<\/strong>&nbsp;) tamb\u00e9m \u00e9 referenciado principalmente em sua sigla (&nbsp;<strong>Bourne-Again SHell<\/strong>&nbsp;).&nbsp;Em termos de compatibilidade,&nbsp;<strong>Bash<\/strong>&nbsp;e&nbsp;<strong>sh<\/strong>&nbsp;s\u00e3o uma combina\u00e7\u00e3o perfeita.&nbsp;Recursos \u00fateis evidentes no&nbsp;shell&nbsp;<strong>C (&nbsp;csh<\/strong>&nbsp;) e no shell&nbsp;<strong>Korn<\/strong>&nbsp;(&nbsp;<strong>ksh<\/strong>&nbsp;) tamb\u00e9m s\u00e3o incorporados a esse interpretador de linguagem shell.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>Em termos de implementa\u00e7\u00e3o, o&nbsp;<strong>Bash<\/strong>&nbsp;destina-se a estar em conformidade com a especifica\u00e7\u00e3o&nbsp;<strong>IEEE POSIX<\/strong>&nbsp;(Padr\u00e3o IEEE 1003.1) Parte de ferramentas e IEEE POSIX Shell.&nbsp;Portanto, como uma ferramenta interativa e de programa\u00e7\u00e3o, as melhorias funcionais oferecidas pelo Bash superam as presentes no&nbsp;<strong>sh<\/strong>&nbsp;.<\/p>\n\n\n\n<p>Os usu\u00e1rios do Linux e de outros sistemas operacionais baseados em GNU n\u00e3o s\u00e3o for\u00e7ados a confiar apenas no&nbsp;<strong>Bash<\/strong>&nbsp;como seu principal interpretador de linguagem de comando, pois vers\u00f5es do shell como o&nbsp;<strong>csh<\/strong>&nbsp;tamb\u00e9m s\u00e3o pr\u00e9-empacotadas nesses sistemas.&nbsp;O Bash \u00e9 configurado apenas para funcionar como um shell padr\u00e3o do Linux devido a seus atributos de shell exclusivos, como portabilidade.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Comparando $()  com  ${} no Bash<\/h3>\n\n\n\n<p>Para comparar esses dois atributos associados ao ambiente&nbsp;<strong>Bash<\/strong>&nbsp;, teremos que reiterar&nbsp;<code>$() <\/code>ou&nbsp;<code>$(command)<\/code>  e&nbsp;<code>${}<\/code>  ou &nbsp;<code>${parameter}<\/code>.&nbsp;Podemos, portanto, tentar definir essas duas entidades Bash.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Entendendo $(comando)<\/h4>\n\n\n\n<p><code>$(command)<\/code>no&nbsp;<strong>Bash<\/strong>&nbsp;refere-se \u00e0 substitui\u00e7\u00e3o de comandos.&nbsp;Para ser mais espec\u00edfico, a parte do comando em <code>$(command)<\/code> \u00e9 executada, sua sa\u00edda \u00e9 capturada e impressa na sa\u00edda padr\u00e3o.<\/p>\n\n\n\n<p>A sintaxe por tr\u00e1s&nbsp;<code>$(command)<\/code> \u00e9 em n\u00edvel de token.&nbsp;Considere a execu\u00e7\u00e3o do seguinte comando que pretende imprimir a data atual no terminal.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$ echo \"Hoje \u00e9 $(date). Um belo dia.\"<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"571\" height=\"69\" src=\"https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2023\/02\/image.png\" alt=\"\" class=\"wp-image-17569\" srcset=\"https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2023\/02\/image.png 571w, https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2023\/02\/image-300x36.png 300w, https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2023\/02\/image-150x18.png 150w\" sizes=\"auto, (max-width: 571px) 100vw, 571px\" \/><\/figure>\n\n\n\n<p>A execu\u00e7\u00e3o acima pode ser explicada da seguinte maneira.&nbsp;Primeiramente, o comando&nbsp;<strong>date<\/strong>&nbsp;\u00e9 executado e sua sa\u00edda \u00e9 inclu\u00edda como um argumento para o&nbsp;comando <strong>echo<\/strong>.<\/p>\n\n\n\n<p>Aqui, podemos presumir que a substitui\u00e7\u00e3o do comando \u00e9 executada em um sub-shell separado antes de sua reinclus\u00e3o no shell principal.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Compreendendo ${par\u00e2metro}<\/h4>\n\n\n\n<p><code>${parameter}<\/code> no&nbsp;<strong>Bash<\/strong>&nbsp;refere-se \u00e0 substitui\u00e7\u00e3o de par\u00e2metros.&nbsp;De acordo com a p\u00e1gina de manual do Bash, um par\u00e2metro \u00e9 uma entidade de armazenamento de valor.&nbsp;A entidade de par\u00e2metro pode ser associada a um nome, n\u00famero ou caracteres especiais.<\/p>\n\n\n\n<p>As chaves&nbsp;<code>{}<\/code> implicam que estamos lidando com um par\u00e2metro posicional ou que o par\u00e2metro em uso (valor do par\u00e2metro) \u00e9 sucedido por um caractere n\u00e3o interpretativo que n\u00e3o deve ser associado ao nome do par\u00e2metro, por exemplo&nbsp;<code>${animal}s<\/code>.<\/p>\n\n\n\n<p>Quanto aos par\u00e2metros posicionais, um ou mais d\u00edgitos podem ser usados \u200b\u200bpara denot\u00e1-lo (com exce\u00e7\u00e3o do \u00fanico d\u00edgito 0).&nbsp;Portanto, se tivermos uma vari\u00e1vel chamada&nbsp;<code>$variable_name<\/code>, a substitui\u00e7\u00e3o do par\u00e2metro&nbsp;<code>${parameter}<\/code> pode ser usada para recuperar o valor da vari\u00e1vel associada.<\/p>\n\n\n\n<p>Considere o seguinte comando de declara\u00e7\u00e3o de vari\u00e1vel:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$ animal=lion<\/code><\/pre>\n\n\n\n<p>Vamos chamar a vari\u00e1vel&nbsp;<strong>animal<\/strong>&nbsp;na tentativa de pluralizar o valor da vari\u00e1vel:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$ echo $animals<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"352\" height=\"129\" src=\"https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2023\/02\/image-1.png\" alt=\"\" class=\"wp-image-17570\" srcset=\"https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2023\/02\/image-1.png 352w, https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2023\/02\/image-1-300x110.png 300w, https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2023\/02\/image-1-150x55.png 150w\" sizes=\"auto, (max-width: 352px) 100vw, 352px\" \/><\/figure>\n\n\n\n<p>Nada \u00e9 impresso na sa\u00edda padr\u00e3o porque o&nbsp;<strong>Bash<\/strong>&nbsp;n\u00e3o entende a vari\u00e1vel&nbsp;<code>$animals<\/code>.&nbsp;No entanto, podemos chamar nossa&nbsp;<code><strong>$animals<\/strong><\/code> vari\u00e1vel com sucesso usando a abordagem de substitui\u00e7\u00e3o de par\u00e2metro da seguinte maneira:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>echo ${animal}s<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"376\" height=\"175\" src=\"https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2023\/02\/image-2.png\" alt=\"\" class=\"wp-image-17571\" srcset=\"https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2023\/02\/image-2.png 376w, https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2023\/02\/image-2-300x140.png 300w, https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2023\/02\/image-2-150x70.png 150w\" sizes=\"auto, (max-width: 376px) 100vw, 376px\" \/><\/figure>\n\n\n\n<p>Em alguns cen\u00e1rios, um ponto de exclama\u00e7\u00e3o pode suceder a primeira chave esquerda da implementa\u00e7\u00e3o de substitui\u00e7\u00e3o de par\u00e2metro.&nbsp;Nesse caso, o conceito de indire\u00e7\u00e3o vari\u00e1vel ocorre.<\/p>\n\n\n\n<p>O valor da vari\u00e1vel tem preced\u00eancia sobre o valor do par\u00e2metro conforme demonstrado abaixo:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$ animal=lion \n$ echo $animal\n$ lion=dog\n$ echo $lion\n$ echo ${!animal}<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"247\" src=\"https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2023\/02\/image-3.png\" alt=\"\" class=\"wp-image-17572\" srcset=\"https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2023\/02\/image-3.png 400w, https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2023\/02\/image-3-300x185.png 300w, https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2023\/02\/image-3-150x93.png 150w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/figure>\n\n\n\n<p>Agora fa\u00e7a varia\u00e7\u00f5es destes exemplos, pratique e aprenda um pouco mais de como Bash pode nos ajudar no dia a dia.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Os sistemas operacionais baseados em GNU, como&nbsp;o Linux, dependem de um interpretador de linguagem de comando ou shell chamado&nbsp;Bash&nbsp;para realizar<\/p>\n","protected":false},"author":4,"featured_media":17574,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","_editorskit_title_hidden":false,"_editorskit_reading_time":0,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","footnotes":""},"categories":[302,303,325],"tags":[361,144,134],"class_list":["post-17568","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-destaque-principal","category-destaque-secundario","category-linux","tag-bash","tag-linux","tag-shell"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Diferen\u00e7a entre ${} e $() no Bash - SOLOWEB Tecnologia<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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