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GNU shell utilities

5.4.2 Numeric expressions

expr supports the usual numeric operators, in order of increasing precedence. The string operators (previous section) have lower precedence, the connectives (next section) have higher.

`+ -'

Addition and subtraction. Both arguments are coerced to numbers; an error occurs if this cannot be done.

`* / %'

Multiplication, division, remainder. Both arguments are coerced to numbers; an error occurs if this cannot be done.