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Annotation of 43BSDTahoe/man/man1/expr.1, revision 1.1

1.1     ! root        1: .\"    @(#)expr.1      6.1 (Berkeley) 4/29/85
        !             2: .\"
        !             3: .TH EXPR 1 "April 29, 1985"
        !             4: .AT 3
        !             5: .SH NAME
        !             6: expr \- evaluate arguments as an expression
        !             7: .SH SYNOPSIS
        !             8: .B expr
        !             9: arg
        !            10: .B .\|.\|.
        !            11: .SH DESCRIPTION
        !            12: The arguments are taken as an expression.
        !            13: After evaluation, the result is written on the standard output.
        !            14: Each token of the expression is a separate argument.
        !            15: .PP
        !            16: The operators and keywords are listed below.
        !            17: The list is in order of increasing precedence,
        !            18: with equal precedence operators grouped.
        !            19: .TP
        !            20: .I expr | expr
        !            21: yields the first
        !            22: .I expr
        !            23: if it is neither null nor `0', otherwise
        !            24: yields the second
        !            25: .I expr.
        !            26: .TP
        !            27: .I expr & expr
        !            28: yields the first
        !            29: .I expr
        !            30: if neither
        !            31: .I expr
        !            32: is null or `0', otherwise yields `0'.
        !            33: .TP
        !            34: .I expr relop expr
        !            35: where
        !            36: .I relop is one of
        !            37: < <= = != >= >,
        !            38: yields `1' if the indicated comparison is true, `0' if false.
        !            39: The comparison is numeric if both
        !            40: .I expr
        !            41: are integers, otherwise lexicographic.
        !            42: .TP
        !            43: .IR expr " + " expr
        !            44: .br
        !            45: .ns
        !            46: .TP
        !            47: .IR expr " \- " expr
        !            48: .br
        !            49: addition or subtraction of the arguments.
        !            50: .TP
        !            51: .IR expr " * " expr
        !            52: .br
        !            53: .ns
        !            54: .TP
        !            55: .IR expr " / " expr
        !            56: .br
        !            57: .ns
        !            58: .TP
        !            59: .IR expr " % " expr
        !            60: .br
        !            61: multiplication, division, or remainder of the arguments.
        !            62: .TP
        !            63: .IR expr " : " expr
        !            64: The matching operator compares the string first argument
        !            65: with the regular expression second argument;
        !            66: regular expression syntax is the same as that of
        !            67: .IR ed (1).
        !            68: The
        !            69: \fB\\(\|.\|.\|.\|\\)\fP
        !            70: pattern symbols can be used to select a portion of the
        !            71: first argument.
        !            72: Otherwise,
        !            73: the matching operator yields the number of characters matched
        !            74: (`0' on failure).
        !            75: .TP
        !            76: .RI ( " expr " )
        !            77: parentheses for grouping.
        !            78: .PP
        !            79: Examples:
        !            80: .PP
        !            81: To add 1 to the Shell variable
        !            82: .IR a :
        !            83: .IP
        !            84: a=\`expr $a + 1\`
        !            85: .PP
        !            86: To find the filename part (least significant part)
        !            87: of the pathname stored in variable
        !            88: .I a,
        !            89: which may or may not contain `/':
        !            90: .IP
        !            91: expr $a : \'.*/\e(\^.*\e)\' \'\^|\' $a
        !            92: .LP
        !            93: Note the quoted Shell metacharacters.
        !            94: .SH "SEE ALSO"
        !            95: sh(1), test(1)
        !            96: .SH DIAGNOSTICS
        !            97: .I Expr
        !            98: returns the following exit codes:
        !            99: .PP
        !           100:        0       if the expression is neither null nor `0',
        !           101: .br
        !           102:        1       if the expression
        !           103: is null or `0',
        !           104: .br
        !           105:        2       for invalid expressions.

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