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. file [ arg ... ]
Read commands from file and execute them in the current shell
environment.
If file does not contain a slash, or if PATH_DIRS is set, the
shell looks in the components of $path to find the directory
containing file. Files in the current directory are not read
unless `.' appears somewhere in $path. If a file named
`file.zwc' is found, is newer than file, and is the compiled
form (created with the zcompile builtin) of file, then commands
are read from that file instead of file.
If any arguments arg are given, they become the positional pa-
rameters; the old positional parameters are restored when the
file is done executing. However, if no arguments are given, the
positional parameters remain those of the calling context, and
no restoring is done.
If file was not found the return status is 127; if file was
found but contained a syntax error the return status is 126;
else the return status is the exit status of the last command
executed.
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