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Full Discussion: Searching for pattern in variable using case statements
Top Forums Shell Programming and Scripting Searching for pattern in variable using case statements Post 302977965 by Don Cragun on Sunday 24th of July 2016 05:25:11 PM
Old 07-24-2016
You could also try:
Code:
#!/bin/ksh
COUNTPRO2="gine is very bad
vine is pretty good"

while IFS= read -r factor
do	case "$factor" in
	(*vine*)printf '%s\n' "$factor"
		;;
	esac
done <<EOF
$COUNTPRO2
EOF

Note that I used printf instead of echo because the output you get from echo might not be what you want if a line in the expansion of $COUNTPRO2 starts with a hyphen or contains any backslash characters. And, using a here-document instead of an array makes it portable to many more shells.

Forking and execing an external utility is a VERY slow operation when compared to the actions required to perform a case statement pattern match.

Although the above was written and tested using a Korn shell, this should work with any shell that is based on Bourne shell syntax (including a 1970's vintage pure Bourne shell).
These 2 Users Gave Thanks to Don Cragun For This Post:
rbatte1 SkySmart
 

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LEARN ABOUT NETBSD

factor

FACTOR(6)							 BSD Games Manual							 FACTOR(6)

NAME

     factor -- factor a number

SYNOPSIS

     factor [number ...]

DESCRIPTION

     The factor utility factors integers larger than 1.  When a number is factored, it is printed, followed by a ``:'', and the list of (prime)
     factors on a single line.	Factors are listed in ascending order, and are preceded by a space.  If a factor divides a value more than once,
     it will be printed more than once.

     When factor is invoked with one or more arguments, each argument will be factored.

     When factor is invoked with no arguments, factor reads numbers, one per line, from standard input, until end of file or error.  Leading
     white-space and empty lines are ignored.  Numbers may be preceded by a single +.  Integer less than 2 are rejected.  Numbers are terminated
     by a non-digit character (such as a newline).  After a number is read, it is factored.  Input lines must not be longer than LINE_MAX - 1
     (currently 2047) characters.

     By default, factor is compiled against the OpenSSL bignum implementation openssl_bn(3), which lets it handle arbitrarily large values.  (Note
     however that very large values can take a very long time to factor.) If factor is compiled without OpenSSL it is limited to the maximum value
     of unsigned long.

DIAGNOSTICS

     Out of range or invalid input results in an appropriate error message being written to standard error.

BSD
								   May 15, 2010 							       BSD
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