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Gema is a general-purpose text processing utility based on the concept of pattern matching. It reads an input file and copies it to an output file, performing specific transformations on the data according to a set of patterns defined by the user. This tool performs functions similar to Unix utilities such as cpp, grep, sed, awk, or strings. It operates as a macro processor, but with greater generality than cpp or m4, as it does not impose a particular syntax for macro calls.