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EXPR !!!EXPR NAME SYNOPSIS DESCRIPTION AUTHOR REPORTING BUGS COPYRIGHT SEE ALSO ---- !!NAME expr - evaluate expressions !!SYNOPSIS __expr__ ''EXPRESSION''__ expr__ ''OPTION'' !!DESCRIPTION __--help__ display this help and exit __--version__ output version information and exit Print the value of EXPRESSION to standard output. A blank line below separates increasing precedence groups. EXPRESSION may be: ARG1 | ARG2 ARG1 if it is neither null nor 0, otherwise ARG2 ARG1 ARG1 if neither argument is null or 0, otherwise 0 ARG1 ARG1 is less than ARG2 ARG1 ARG1 is less than or equal to ARG2 ARG1 = ARG2 ARG1 is equal to ARG2 ARG1 != ARG2 ARG1 is unequal to ARG2 ARG1 ARG1 is greater than or equal to ARG2 ARG1 ARG1 is greater than ARG2 ARG1 + ARG2 arithmetic sum of ARG1 and ARG2 ARG1 - ARG2 arithmetic difference of ARG1 and ARG2 ARG1 * ARG2 arithmetic product of ARG1 and ARG2 ARG1 / ARG2 arithmetic quotient of ARG1 divided by ARG2 ARG1 % ARG2 arithmetic remainder of ARG1 divided by ARG2 STRING : REGEXP anchored pattern match of REGEXP in STRING match STRING REGEXP same as STRING : REGEXP substr STRING POS LENGTH substring of STRING, POS counted from 1 index STRING CHARS index in STRING where any CHARS is found, or 0 length STRING length of STRING quote TOKEN interpret TOKEN as a string, even if it is a keyword like `match' or an operator like `/' ( EXPRESSION ) value of EXPRESSION Beware that many operators need to be escaped or quoted for shells. Comparisons are arithmetic if both ARGs are numbers, else lexicographical. Pattern matches return the string matched between and ) or null; if and ) are not used, they return the number of characters matched or 0. __expr exits with:__ 0 if the expression is neither null nor 0; 1 if the expression is null or 0; or 2 for invalid expressions. !!AUTHOR Written by Mike Parker. !!REPORTING BUGS Report bugs to !!COPYRIGHT Copyright 2000 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. !!SEE ALSO The full documentation for __expr__ is maintained as a Texinfo manual. If the __info__ and __expr__ programs are properly installed at your site, the command __info expr__ should give you access to the complete manual. ----
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