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Hello!
I want to evaluate some mathematical expressions in a script and I try to use 'expr' command. Unfortunatally, when I have, for example, expr 8.2 + 6 the result is 'expr: non-numeric argument' Why ? I work on SunOs 5.7. Thanks in advance Nathe |
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but when I read the man of expr, it's written:
DESCRIPTION Concatenates arg's (adding separator spaces between them), evaluates the result as a Tcl expression, and returns the value. The operators permitted in Tcl expressions are a subset of the operators permitted in C expressions, and they have the same meaning and precedence as the corresponding C operators. Expressions almost always yield numeric results (integer or floating-point values). For example, the expression expr 8.2 + 6 evaluates to 14.2. Tcl expressions differ from C expres- sions in the way that operands are specified. Also, Tcl expressions support non-numeric operands and string com- parisons. So it should work, no ? |
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What shell scripting are you trying to write actually? It sounds from the first post that you are writing a plain sh-like scripting using expr(1), but the manpage you quoted is a TCL manpage that describes expr in TCL, which accepts floating point arithmetic. If you are not dealing with TCL at all then you have simply read the wrong manpage.
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