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Annotation of researchv10dc/dist/man/v4/man1/if.1, revision 1.1

1.1     ! root        1: .th IF I 3/15/72
        !             2: .sh NAME
        !             3: if \*-  conditional command
        !             4: .sh SYNOPSIS
        !             5: .bd if
        !             6: expr command [ arg ... ]
        !             7: .sh DESCRIPTION
        !             8: .it If
        !             9: evaluates the expression
        !            10: .it expr,
        !            11: and if its value is
        !            12: true,
        !            13: executes the given
        !            14: .it command
        !            15: with the given arguments.
        !            16: .s3
        !            17: The following primitives are used to construct
        !            18: the
        !            19: .it expr:
        !            20: .s3
        !            21: .lp +10 10
        !            22: \fB\*-r\fR|file        true if the file exists and is readable.
        !            23: .s3
        !            24: .lp +10 10
        !            25: \fB\*-w|\fRfile        true if the file exists and is writable
        !            26: .s3
        !            27: .lp +10 10
        !            28: s1|\fB=|\fRs2  true
        !            29: if the strings
        !            30: .it s1
        !            31: and
        !            32: .it s2
        !            33: are equal.
        !            34: .s3
        !            35: .lp +10 10
        !            36: s1|\fB!=|\fRs2 true
        !            37: if the strings
        !            38: .it s1
        !            39: and
        !            40: .it s2
        !            41: are not equal.
        !            42: .s3
        !            43: .i0
        !            44: These primaries may be combined with the
        !            45: following operators:
        !            46: .s3
        !            47: .lp +10 10
        !            48: \fB!\fR        unary negation operator
        !            49: .s3
        !            50: .lp +10 10
        !            51: \fB\*-a\fR     binary
        !            52: .it and
        !            53: operator
        !            54: .s3
        !            55: .lp +10 10
        !            56: \fB\*-o\fR     binary
        !            57: .it or
        !            58: operator
        !            59: .s3
        !            60: .lp +10 10
        !            61: \fB(|\fRexpr\fB|)\fR   parentheses for grouping.
        !            62: .s3
        !            63: .i0
        !            64: .bd \*-a
        !            65: has higher precedence than
        !            66: .bd \*-o.
        !            67: Notice that all the operators and flags are separate
        !            68: arguments to
        !            69: .it if
        !            70: and hence must be surrounded by spaces.
        !            71: Notice also that parentheses are meaningful
        !            72: to the Shell and must be escaped.
        !            73: .sh "SEE ALSO"
        !            74: sh(I)
        !            75: .sh BUGS

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