April 2025
Intermediate to advanced
248 pages
6h 19m
Portuguese (Portugal, Brazil)
Content preview from Linux eficiente na linha de comandos
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Capítulo 6. Pais, filhos e ambientes
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O objetivo da shell - correr comandos - é tão fundamental para o Linux que podes pensar que a shell está incorporada no Linux de alguma forma especial. Não está. Uma shell é apenas um programa comum como lsou cat. Está programado para repetir os seguintes passos vezes e vezes e vezes e vezes e vezes...
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Imprime um prompt.
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Lê um comando do stdin.
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Avalia e executa o comando.
O Linux faz um bom trabalho ao esconder o facto de que uma shell é um programa vulgar. Quando fazes o login, Linux corre automaticamente uma instância da shell para ti, conhecida como a tua shell de login. Lança tão perfeitamente que parece ser o Linux, quando na verdade é apenas um programa lançado em seu nome para interagir com o Linux.
Onde está o teu Shell de Login?
Se fizeres login num terminal não gráfico, digamos, utilizando um programa cliente SSH, a shell de login é a shell inicial com a qual interages. Imprime o primeiro prompt e aguarda o seu comando.
Alternativamente, se estiveres na consola do computador com um ecrã gráfico, a tua shell de início de sessão corre nos bastidores. Lança um ambiente de desktop como o GNOME, Unity, Cinnamon, ou KDE Plasma. Depois podes abrir janelas de terminal para correr shells interactivas adicionais.
Quanto mais compreenderes acerca da shell, mais eficazmente poderás trabalhar com o Linux e menos superstições ...
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