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Added expr, from Edward Betts <edward@debian.org>, with some fixups

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and docs added by me.
 -Erik
This commit is contained in:
Eric Andersen
2000-09-05 17:37:48 +00:00
parent 43c8c38bbf
commit 1b355ebba6
16 changed files with 1247 additions and 6 deletions
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docs/busybox.pod
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@ -497,6 +497,45 @@ Example:
-------------------------------
=item echo
Usage: expr EXPRESSION
Prints the value of EXPRESSION to standard output.
EXPRESSION may be:
ARG1 | ARG2 ARG1 if it is neither null nor 0, otherwise ARG2
ARG1 & ARG2 ARG1 if neither argument is null or 0, otherwise 0
ARG1 < ARG2 ARG1 is less than ARG2
ARG1 <= ARG2 ARG1 is less than or equal to ARG2
ARG1 = ARG2 ARG1 is equal to ARG2
ARG1 != ARG2 ARG1 is unequal to ARG2
ARG1 >= ARG2 ARG1 is greater than or equal to ARG2
ARG1 > ARG2 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.
-------------------------------
=item false
Returns an exit code of FALSE (1)
@ -2112,4 +2151,4 @@ Enrique Zanardi <ezanardi@ull.es>
=cut
# $Id: busybox.pod,v 1.65 2000/09/01 16:12:57 andersen Exp $
# $Id: busybox.pod,v 1.66 2000/09/05 17:37:48 andersen Exp $