11-14-2014
Quote:
Originally Posted by
ksmarine1980
Thank you, Carona. I'll try that but would like to learn how to do it both ways.
I told you both ways.
Quote:
Originally Posted by
ksmarine1980
I'm using it as part of an exercise in the book. In this respect, I want to use it (or tcsh)
CSH is not UNIX, it's a nonstandard language which was popular in the early 80's(it supported "fancy" things like line editing!) but has only clung to a weird, tenuous life since then -- mostly through it being forcefed to new students through badly out-of-date textbooks. Occasional old systems still run it to use scripts old enough to be having mid-life crises. Kind of the UNIX equivalent of qbasic.
These days a proper UNIX shell has all the same advantages with none of the notorious design flaws.
Last edited by Corona688; 11-14-2014 at 11:39 AM..
This User Gave Thanks to Corona688 For This Post:
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EXPR(1) General Commands Manual EXPR(1)
NAME
expr - evaluate arguments as an expression
SYNOPSIS
expr arg ...
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.
The operators and keywords are listed below. The list is in order of increasing precedence, with equal precedence operators grouped.
expr | expr
yields the first expr if it is neither null nor `0', otherwise yields the second expr.
expr & expr
yields the first expr if neither expr is null or `0', otherwise yields `0'.
expr relop expr
where relop is one of < <= = != >= >, yields `1' if the indicated comparison is true, `0' if false. The comparison is numeric if
both expr are integers, otherwise lexicographic.
expr + expr
expr - expr
addition or subtraction of the arguments.
expr * expr
expr / expr
expr % expr
multiplication, division, or remainder of the arguments.
expr : expr
The matching operator compares the string first argument with the regular expression second argument; regular expression syntax is
the same as that of ed(1). The (...) pattern symbols can be used to select a portion of the first argument. Otherwise, the
matching operator yields the number of characters matched (`0' on failure).
( expr )
parentheses for grouping.
Examples:
To add 1 to the Shell variable a:
a=`expr $a + 1`
To find the filename part (least significant part) of the pathname stored in variable a, which may or may not contain `/':
expr $a : '.*/(.*)' '|' $a
Note the quoted Shell metacharacters.
SEE ALSO
ed(1), sh(1), test(1)
DIAGNOSTICS
Expr returns the following exit codes:
0 if the expression is neither null nor `0',
1 if the expression is null or `0',
2 for invalid expressions.
EXPR(1)