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The 6 test patterns that real-world Bash scripts actually use

Check if a file is really a file, whether a string contains anything, and whether you can run a program with these vital patterns.
EDN

EDN Access–04.10.97 VHDL and Verilog fundamentals–expressions, operands, and operators

The data objects in VHDL and Verilog form expression operands. Knowing the operand differences between the two HDLs helps you write more efficient chip-design code. Expressions consist of operators ...