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-.TH EXPR 1
-.CT 1 shell 
-.SH NAME
-expr \- integer and string-match expression evaluator for shell scripts
-.SH SYNOPSIS
-.B expr
-.I arg ...
-.SH DESCRIPTION
-The arguments are taken as an expression.
-After evaluation, the result is written on the standard output.
-Each token of the expression is a separate argument.
-.PP
-The operators and keywords are listed below
-in order of increasing precedence,
-with equal precedence operators grouped.
-.TP \w'\f5(\fI\ expr\ \f5)\ 'u
-.IB expr1 " | " expr2
-Value is the value of
-.I expr1
-if that is neither empty nor 0,
-otherwise the value of 
-.IR expr2.
-.TP
-.IB expr1 " & " expr2
-Value is the value of
-.I expr1
-if neither
-.I expr1
-nor
-.I expr2
-is empty or 0, otherwise 0.
-.TP
-.I expr1 relop expr2
-.I Relop
-is one of
-.L "< <= = != >= >" .
-Value is 1
-if the indicated comparison is true, 0
-if false.
-The comparison is numeric if both
-.I expr
-are integers, otherwise lexicographic.
-.TP
-.IB expr1 " + " expr2
-.br
-.ns
-.TP
-.IB expr1 " - " expr2
-.br
-Value is the sum or difference of the (integer) values of 
-.I expr1
-and
-.I expr2.
-.TP
-.IB expr1 " * " expr2
-.br
-.ns
-.TP
-.IB expr1 " / " expr2
-.br
-.ns
-.TP
-.IB expr1 " % " expr2
-.br
-Value is the product, quotient, or remainder of the (integer)
-values of 
-.I expr1
-and
-.I expr2.
-.TP
-.IB expr " : " regexp
-Match the string value of 
-.I expr
-with the regular expression 
-.IR regexp ;
-regular expression syntax is the same as in
-.IR ed (1),
-but matches are anchored at the left.
-On success a subexpression
-.BR \e(\| ... \|\e) ,
-if present in
-.I regexp,
-picks out a return value from the matched string.
-Otherwise,
-the matching operator yields the number of characters matched
-(0 on failure).
-.TP
-.BI ( " expr " )
-Parentheses for grouping.
-.TP
-.I arg
-Value is the string
-.I arg.
-.PP
-.SH EXAMPLES
-.TP
-.L
-a=`expr $a + 1`
-Add 1 to shell variable
-.IR a .
-.TP
-.L
-expr $a : '.*/\e(.*\e)' '|' $a
-Same as
-.LR "basename $a" .
-.SH "SEE ALSO"
-.IR sh (1), 
-.IR test (1)
-.SH DIAGNOSTICS
-.I Expr
-returns exit code 0 if the expression is neither null nor 0,
-1 if the expression is null or 0, 2 for invalid expressions.