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25 lines
1.1 KiB
Text
25 lines
1.1 KiB
Text
texinode(Command Execution)(Functions)(Redirection)(Top)
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chapter(Command Execution)
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ifzman(\
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sect(Command Execution)
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)\
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cindex(command execution)
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cindex(execution, of commands)
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If a command name contains no slashes, the shell attempts to locate
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it. If there exists a shell function by that name, the function
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is invoked as described in noderef(Functions). If there exists
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a shell builtin by that name, the builtin is invoked.
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vindex(path, use of)
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Otherwise, the shell searches each element of tt($path) for a
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directory containing an executable file by that name. If the
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search is unsuccessful, the shell prints an error message and returns
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a nonzero exit status.
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If execution fails because the file is not in executable format,
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and the file is not a directory, it is assumed to be a shell
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script. tt(/bin/sh) is spawned to execute it. If the program
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is a file beginning with `tt(#!)', the remainder of the first line
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specifies an interpreter for the program. The shell will
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execute the specified interpreter on operating systems that do
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not handle this executable format in the kernel.
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