expr — Evaluate Arguments as an Expression
Synopsis
/usr/bin/expr argument... /usr/xpg4/bin/expr argument... /usr/ucb/expr argument...
Description
The expr command evaluates the expression and writes the result to standard output. Each token of the expression is a separate argument, so you must separate terms of the expression by blanks. Quote strings containing blanks or other special characters. You can precede integer-valued arguments by a unary minus sign. Escape characters special to the shell. The length of the expression is limited to LINE_MAX (2048 characters).
Note
The character 0 is written to indicate a zero value and nothing is written to indicate a null string.
Operands
The operators and keywords are listed below. The list ...
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