Learn the conditional statement ~

Author: GoogTech

Conditional-Statement/Case_MatchedPattern.sh

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+#Description : The matched model of case statement.
+#Author : HuangYuhui
+#Date : January 16,2018
+
+#!/bin/bash
+
+#Get the data inputed by the user.
+read -p "Please press some key,then press return :" KEY
+
+#matche by the case statement.
+case $KEY in
+
+ [a-z] | [A-Z])
+	echo "You press a letter ~"
+	;;
+
+[0-9])
+	echo "You press a digit ~"
+	;;
+
+*)
+	echo "You press anthor key rather letter or digit ~"
+
+esac

Conditional-Statement/Case_Statement.sh

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+#Description : Case statement
+#Author : HuangYuhui
+#Date January 16,2018
+
+#!/bin/bash
+
+SYSTEM=`uname -s`		#Output the name of keranl.
+case "$SYSTEM" in
+
+"Linux")						#The kernal name of Linux sysem operation be called : Linux
+	echo "Linux"
+	;;
+
+"FreeBSD")					#...
+	echo "FreeBSD"
+	;;
+
+"Solaris")					#...
+	echo "Solaris"
+	;;
+
+"Windows")					#...
+	echo "Windows"
+	;;
+*)									#Default 
+	echo "The ture kernal name : $SYSTEM"
+	;;
+
+esac
+

Conditional-Statement/If_Sorting.sh

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+#Description : Sorting
+#Author : HuangYuhui
+#Date : January 16,2018
+
+#!/bin/bash
+
+#Give a tip if the total of number is error inputed by the user.
+if [ "$#" -ne 3 ];then
+	echo "Please enter the number ! such as : /.$0 num1 num2 num3"
+	exit 0
+fi
+
+#Receive the number inputed by the user.
+a=$1
+b=$2
+c=$3
+
+#If a greater than b,a and b swap positions.
+if [ $a -gt $b ];then
+	tmp=$a
+	a=$b
+	b=$tmp
+fi
+
+#If a greater than c, a and c swap positions.
+if [ $a -gt $c ];then
+	tmp=$a
+	a=$c
+	c=$tmp
+fi
+
+#If b greater than c, b and c swap positions.
+if [ $b -gt $c ];then
+	tmp=$b
+	b=$c
+	c=$tmp
+fi
+
+#Output the result as sorting.
+echo "The result as sorting : $a $b $c"
+