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dc517212ca
Don't behave as if command not found if return status is non-zero as this may simply be the return status of the replacement command. Let the function report a command not found instead.
38 lines
1.7 KiB
Text
38 lines
1.7 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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cindex(command not found, handling of)
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findex(command_not_found_handler)
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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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If no external command is found but a function tt(command_not_found_handler)
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exists the shell executes this function with all
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command line arguments. The return status of the function becomes the
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status of the command. If the function wishes to mimic the
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behaviour of the shell when the command is not found, it should
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print the message `tt(command not found:) var(cmd)' to standard error
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and return status 127. Note that the handler is executed in a
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subshell forked to execute an external command, hence changes to
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directories, shell parameters, etc. have no effect on the main shell.
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