Chapter 14

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#!/bin/bash
# func
# A simple function
repeat() {
	echo -n “I don’t know $1 $2 “
}
repeat Your Name

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#!/bin/bash
# nested
# Calling one function from another
number_one () {
	echo “This is the first function speaking...”
	number_two
}
number_two () {
	echo “This is now the second function speaking...”
}
number_one

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#!/bin/bash
# scope
# dealing with local and global variables scope () {
	local lclVariable=1
	gblVariable=2
	echo “lclVariable in function = $lclVariable”
	echo “gblVariable in function = $gblVariable”
}
scope
# We now test the two variables outside the function block to see what happens echo “lclVariable outside function = $lclVariable”
echo “gblVariable outside function = $gblVariable”
exit 0

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scope ()
{
	local lclVariable=1
	gblVariable=2
	echo “lclVariable in function = $lclVariable”
	echo “gblVariable in function = $gblVariable”
}
another_scope_function()
{
	echo “This is another_scope_function...”
}
yet_another_function()
{
	echo “This is yet_another_function...”
}

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#!/bin/bash
# get
# A script for demonstrating getopts
while getopts “xy:z:” name
do
echo “$name” $OPTIND $OPTARG
done

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if [ -r writeFile && -x writeFile ]
then
	echo “writeFile exists, is readable, and executable!”
fi

and

if [ -r writeFile || -w writeFile ]
then
	echo “writeFile exists and is readable or writable!”
fi

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#!/bin/bash
# sigtrap
# A small script to demonstrate signal trapping 
tmpFile=/tmp/sigtrap$$ cat > $tmpFile function removeTemp() {
	if [ -f “$tmpFile” ]
	then
		echo “Sorting out the temp file... “
		rm -f “$tmpFile”
	fi
}
trap removeTemp 1 2
exit 0

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#!/bin/bash
# array
# A script for populating an array from a file
populated=( `cat ~/tmp/sports.txt | tr ‘\n’ ‘ ‘`)
echo ${populated[@]}
exit 0

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#!/bin/bash -r
# This script won’t work
cd /some/other/directory
set +r
exit 0

#!/bin/bash
# This script won’t work
cd /some/other/directory
echo “`pwd`”
set -r
cd
echo “`pwd`”
set +r
exit 0

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#!/bin/bash
# echobug1
# Faulty echo shell
set -x
ech “Guess the secret color”


set +x