1 1 3.1 Shell Syntax 1 ================ 1
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· Shell Operation The basic operation of the shell.
· Quoting How to remove the special meaning from characters.
· Comments How to specify comments.
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1 When the shell reads input, it proceeds through a sequence of
1 operations. If the input indicates the beginning of a comment, the
1 shell ignores the comment symbol ('#'), and the rest of that line.
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1 Otherwise, roughly speaking, the shell reads its input and divides
1 the input into words and operators, employing the quoting rules to
1 select which meanings to assign various words and characters.
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1 The shell then parses these tokens into commands and other
1 constructs, removes the special meaning of certain words or characters,
1 expands others, redirects input and output as needed, executes the
1 specified command, waits for the command's exit status, and makes that
1 exit status available for further inspection or processing.
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