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Full Discussion: Find string in variable
Top Forums Shell Programming and Scripting Find string in variable Post 302797531 by RudiC on Monday 22nd of April 2013 06:26:57 PM
Old 04-22-2013
Recent kshs (as well as bashes) provide a regex match in conditional expressions. man ksh:
Quote:
Conditional Expressions.
A conditional expression is used with the [[ compound command to test attributes of files and to compare strings. Field splitting and file name generation are not performed on the words between [[ and ]]. Each expression can be constructed from one or more of the following unary or binary expressions: . . .
string =~ ere
True if string matches the pattern ~(E)ere where ere is an extended regular expression.
So your code could read:
Code:
x="aa bb cc dd ee ff gg hh ii jj kk ll"
y="ff kk"
$ for z in $x; do [[ "$y" =~ "$z" ]] && echo $z; done
ff
kk

Aside: that `echo ${x}` is pointless - get rid of it.
This User Gave Thanks to RudiC For This Post:
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LEARN ABOUT PHP

let

let(1)                                                             User Commands                                                            let(1)

NAME

       let - shell built-in function to evaluate one or more arithmetic expressions

SYNOPSIS

   ksh
       let arg...

DESCRIPTION

   ksh
       Each arg is a separate "arithmetic expression" to be evaluated.

EXIT STATUS

       The following exit values are returned:

       0        The value of the last expression is non-zero.

       1        The value of the last expression is zero.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       ksh(1), set(1), typeset(1), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                             let(1)
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