How to check index of a array element in shell script? Post: 302423900

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Top Forums Shell Programming and Scripting How to check index of a array element in shell script? Post 302423900 by tukuyomi on Sunday 23rd of May 2010 06:45:35 AM

05-23-2010

Registered User

In Bash:

Code:

#!/bin/bash

getIndex() {
	index=0
	while [ "${ARRAY[$index]}" != "$VALUE" ] && [ $index -lt "${#ARRAY[@]}" ]; do ((index++)); done
	if [ $index -lt "${#ARRAY[@]}" ]; then
		echo $index
	else
		echo 'Not Found'
	fi
}

ARRAY=(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec)
VALUE='May'

getIndex

exit 0

In Bash (simpler?):

Code:

#!/bin/bash

getIndex() {
	for ((index=0; index<${#ARRAY[@]}; index++)); do 
		if [ "${ARRAY[$index]}" = "$VALUE" ]; then
			echo $index
			return
		fi
	done
	echo 'Not Found'
}

ARRAY=(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec)
VALUE='May'

getIndex

exit 0

A third version, just a modified 2nd version:

Code:

#!/bin/bash

getIndex() {
	index=0; while ((index<${#ARRAY[*]})); do
		if [ "${ARRAY[$index]}" = "$VALUE" ]; then
			echo $index; return
		fi
	((index++)); done
	echo 'Not Found'; return 1
}

ARRAY=(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec)
VALUE='May'

getIndex

exit 0

Last edited by tukuyomi; 05-23-2010 at 11:23 AM.. Reason: Added a third code

tukuyomi

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LEARN ABOUT PHP

gmp_clrbit

GMP_CLRBIT(3)								 1							     GMP_CLRBIT(3)

gmp_clrbit - Clear bit

SYNOPSIS

       void gmp_clrbit (GMP  $a, int  $index)

DESCRIPTION

	Clears (sets to 0) bit $index in $a. The index starts at 0.

PARAMETERS

	      o $a
		-Either  a  GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is
		possible to convert the latter to a number.

	      o $index
		- The index of the bit to clear. Index 0 represents the least significant bit.

RETURN VALUES

	A GMP number resource in PHP 5.5 and earlier, or a GMP object in PHP 5.6 and later.

EXAMPLES

       Example #1

	      gmp_clrbit(3) example

	      <?php
	      $a = gmp_init("0xff");
	      gmp_clrbit($a, 0); // index starts at 0, least significant bit
	      echo gmp_strval($a) . "
";
	      ?>

	      The above example will output:

	      254

NOTES

       Note

	       Unlike most of the other GMP functions, gmp_clrbit(3) must be called with a GMP resource that already exists (using gmp_init(3) for
	      example). One will not be automatically created.

SEE ALSO

       gmp_setbit(3), gmp_testbit(3).

PHP Documentation Group 													     GMP_CLRBIT(3)

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