21.2. Implementation
By their very nature, a sizable part of the functionality of shell scripts is provided by the many utility programs that they routinely call to perform important subsidiary tasks. Addressing the portability of the script involves issues of portability in the host operating system environment and portability of the utility programs as well as the portability of the shell implementation itself.
This section discusses differences between shell implementations to which you must cater when writing a portable script. It is broken into several subsections, each covering a single aspect of shell programming that needs to be approached carefully to avoid pitfalls with unexpected behavior in some shell implementations. The following ...
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