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- If your external programs can be found in a variety of locations depending on the system on which they are run, use exact control over the PATH used to find your programs. Make certain that the current directory (".") is not at the beginning or middle of the PATH. (Note: both "./" and an empty path element ("::" or a leading ":") are equivalent to including ".". ("::" is equivalent to ":.:" and a leading ":" is equivalent to a leading ".:".) For example, you can add a line to the beginning of your program such as:
- shell:
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