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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 OPENSOLARIS

mlib_signalupsample_f32s_f32s

mlib_SignalUpSample_S16_S16(3MLIB)			    mediaLib Library Functions				mlib_SignalUpSample_S16_S16(3MLIB)

NAME

       mlib_SignalUpSample_S16_S16, mlib_SignalUpSample_S16S_S16S, mlib_SignalUpSample_F32_F32, mlib_SignalUpSample_F32S_F32S - signal upsampling

SYNOPSIS

       cc [ flag... ] file... -lmlib [ library... ]
       #include <mlib.h>

       mlib_status mlib_SignalUpSample_S16_S16(mlib_s16 *dst,
	    const mlib_s16 *src, mlib_s32 factor, mlib_s32 phase,
	    mlib_s32 n);

       mlib_status mlib_SignalUpSample_S16S_S16S(mlib_s16 *dst,
	    const mlib_s16 *src, mlib_s32 factor, mlib_s32 phase,
	    mlib_s32 n);

       mlib_status mlib_SignalUpSample_F32_F32(mlib_f32 *dst,
	    const mlib_f32 *src, mlib_s32 factor, mlib_s32 phase,
	    mlib_s32 n);

       mlib_status mlib_SignalUpSample_F32S_F32S(mlib_f32 *dst,
	    const mlib_f32 *src, mlib_s32 factor, mlib_s32 phase,
	    mlib_s32 n);

DESCRIPTION

       Each of these functions performs upsampling.

       For monaural signals, the following equation is used:

	 dst[i] = src[k]  if i == k*factor + phase
	 dst[i] = 0	  if i != k*factor + phase

       where k = 0, 1, ..., (n - 1); i = 0, 1, ..., (n*factor - 1).

       For stereo signals, the following equation is used:

	 dst[2*i]     = src[2*k]      if i == k*factor + phase
	 dst[2*i]     = 0	      if i != k*factor + phase

	 dst[2*i + 1] = src[2*k + 1]  if i == k*factor + phase
	 dst[2*i + 1] = 0	      if i != k*factor + phase

       where k = 0, 1, ..., (n - 1); i = 0, 1, ..., (n*factor - 1).

PARAMETERS

       Each of the functions takes the following arguments:

       dst	 Output signal array.

       src	 Input signal array.

       factor	 Factor by which to upsample. factor >= 1.

       phase	 Parameter that determines relative position of an input value, within the output signal. 0 <= phase < factor.

       n	 Number of samples in the input signal array.

RETURN VALUES

       Each of the functions returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mlib_SignalDownSample_S16_S16(3MLIB), attributes(5)

SunOS 5.11							    2 Mar 2007					mlib_SignalUpSample_S16_S16(3MLIB)
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