expr
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'''expr''' is the standard way to evaluate arithmetic expressions. expr can recognize the 4 main operators (+, -, *, /) and % (the mod operator that return the reminder of the division of two integer), and power operator ^. As it is in KSH the syntax is very strict. first, if you only need to print the result of an operation just write it like that: {msh> expr 1 + 3 4} '''Important notice: you must not forget the spaces between the operator and the operands.''' If you need to make operations on variables you have to use the ((...)) syntax: {msh> set i=1 msh> (( i = $i + 1 )) msh> print $i 2} Since there are so few operators, it is possible to switch to an enhanced arithmetic expressions evaluator: [bc]. * start directly MSH.EXE in ''bc mode'': {msh.exe -bc} * into interactive mode switch between expr and bc mode with internal command '''msh:calc''' {msh> msh:calc (( ... )) now evaluated with bc msh> msh:calc (( ... )) now evaluated with expr (caution to the syntax)}
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