Return to expr.1 CVS log

Up to [Research Unix] / researchv10dc / man / adm / man1

Annotation of researchv10dc/man/adm/man1/expr.1, revision 1.1

1.1     ! root        1: .TH EXPR 1
        !             2: .CT 1 shell 
        !             3: .SH NAME
        !             4: expr \- evaluate arguments as an expression
        !             5: .SH SYNOPSIS
        !             6: .B expr
        !             7: .I arg ...
        !             8: .SH DESCRIPTION
        !             9: The arguments are taken as an expression.
        !            10: After evaluation, the result is written on the standard output.
        !            11: Each token of the expression is a separate argument.
        !            12: .PP
        !            13: The operators and keywords are listed below
        !            14: in order of increasing precedence,
        !            15: with equal precedence operators grouped.
        !            16: .TP \w'\f5(\fI\ expr\ \f5)\ 'u
        !            17: .IB expr1 " | " expr2
        !            18: Value is the value of
        !            19: .I expr1
        !            20: if that is neither empty nor 0,
        !            21: otherwise the value of 
        !            22: .IR expr2.
        !            23: .TP
        !            24: .IB expr1 " & " expr2
        !            25: Value is the value of
        !            26: .I expr1
        !            27: if neither
        !            28: .I expr1
        !            29: nor
        !            30: .I expr2
        !            31: is empty or 0, otherwise 0.
        !            32: .TP
        !            33: .I expr1 relop expr2
        !            34: .I Relop
        !            35: is one of
        !            36: .L "< <= = != >= >" .
        !            37: Value is 1
        !            38: if the indicated comparison is true, 0
        !            39: if false.
        !            40: The comparison is numeric if both
        !            41: .I expr
        !            42: are integers, otherwise lexicographic.
        !            43: .TP
        !            44: .IB expr1 " + " expr2
        !            45: .br
        !            46: .ns
        !            47: .TP
        !            48: .IB expr1 " - " expr2
        !            49: .br
        !            50: Value is the sum or difference of the (integer) values of 
        !            51: .I expr1
        !            52: and
        !            53: .I expr2.
        !            54: .TP
        !            55: .IB expr1 " * " expr2
        !            56: .br
        !            57: .ns
        !            58: .TP
        !            59: .IB expr1 " / " expr2
        !            60: .br
        !            61: .ns
        !            62: .TP
        !            63: .IB expr1 " % " expr2
        !            64: .br
        !            65: Value is the product, quotient, or remainder of the (integer)
        !            66: values of 
        !            67: .I expr1
        !            68: and
        !            69: .I expr2.
        !            70: .TP
        !            71: .IB expr " : " regexp
        !            72: Match the string value of 
        !            73: .I expr
        !            74: with the regular expression 
        !            75: .IR regexp ;
        !            76: regular expression syntax is the same as in
        !            77: .IR ed (1),
        !            78: but matches are anchored at the left.
        !            79: On success a subexpression
        !            80: .BR \e(\| ... \|\e) ,
        !            81: if present in
        !            82: .I regexp,
        !            83: picks out a return value from the matched string.
        !            84: Otherwise,
        !            85: the matching operator yields the number of characters matched
        !            86: (0 on failure).
        !            87: .TP
        !            88: .BI ( " expr " )
        !            89: Parentheses for grouping.
        !            90: .TP
        !            91: .I arg
        !            92: Value is the string
        !            93: .I arg.
        !            94: .PP
        !            95: .SH EXAMPLES
        !            96: .TP
        !            97: .L
        !            98: a=`expr $a + 1`
        !            99: Add 1 to shell variable
        !           100: .IR a .
        !           101: .TP
        !           102: .L
        !           103: expr $a : '.*/\e(.*\e)' '|' $a
        !           104: Same as
        !           105: .LR "basename $a" .
        !           106: .SH "SEE ALSO"
        !           107: .IR sh (1), 
        !           108: .IR test (1)
        !           109: .SH DIAGNOSTICS
        !           110: .I Expr
        !           111: returns exit code 0 if the expression is neither null nor 0,
        !           112: 1 if the expression is null or 0, 2 for invalid expressions.

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.