Conditional testing

Author: GoogTech

Conditional-Testing/File_testing.sh

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+#Description : Conditional testing
+#Author : HuangYuhui
+#Date : Janual 10,2018
+
+#!/bin/bash
+
+#Initialize the path of file.
+file="File_testing.txt"
+
+#Determine whether the file is readable.
+if [ -r $file ]
+	then
+		echo "This file is readable ~"
+	else
+		echo "This file is not readable ~"
+fi
+
+#Determine whether the file is writable.
+if [ -w $file ]
+	then
+		echo "This file is writable ~"
+	else
+		echo "This file is not writable ~"
+fi
+
+#Determine whether the file is executable.
+if [ -x $file ]
+	then
+		echo "This file is executable ~"
+	else
+		echo "This file is not executable ~"
+fi
+
+#Determine the type of file.
+if [ -f $file ]
+	then
+		echo "This file is an ordinary file ~"
+	else
+		echo "This file is a special file ~"
+fi
+
+#Determine whether the file is directory.
+if [ -d $file ]
+	then
+		echo "This file is a directory ~"
+	else
+		echo "This file is not a directory ~"
+fi
+
+#Determine whether the file is empty.
+if [ -s $file ]
+	then
+		echo "This file is not empty ~"
+	else
+		echo "This file is empty ~"
+fi
+
+#Determine whether the file is exist.
+if [ -e $file ]
+	then
+		echo "This file is exist ~"
+	else
+		echo "This file is not exist ~"
+fi
+
+#...
+	

Conditional-Testing/File_testing.txt

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+Create this file for 'File_testing.sh' !
+You can delete it everythime.

Conditional-Testing/IntegerValue_testing.sh

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+#Description : The integer value testing.
+#Author : HuangYuhui
+#Date : January 10,2018
+
+#!/bin/bash
+
+#The common arithmetic manipulation symbols.
+# -eq 	(Reverse:-ne)
+# -ge 	(Reverse:-le)
+# -gt 	(Reverse:-lt)
+# -le		
+# -lt
+# -ne
+
+##
+##You can use the '[[ xxx ]]'/command:'test' to test or learn use these symbols.
+##
+
+
+#Determine whether the two numbers are the same.
+[[ 1 -eq 2 ]]
+echo $?
+#Reverse
+[[ 1 -ne 2 ]]
+echo $?
+
+#Determine the size.
+[[ 1 -lt 2 ]]
+echo $?
+#Reverse
+[[ 1 -gt 2 ]]
+echo $?
+
+#Determine the size.
+x=1
+y=2
+[ "$x" -ge "$y" ]
+echo $?
+#Reverse
+[ "$x" -le "$y" ]
+echo $?
+

Conditional-Testing/Logical_operator.sh

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+#Description : The logical operator.
+#Author : HuangYuhui
+#Date : January 10,2018
+
+#The common logical operator:
+#		-a
+#		-o
+#		!
+#		&&
+#		||
+
+test -e File_testing.sh -a -s File_testing.txt && echo "The condition is true ~"
+
+

Conditional-Testing/String_testing.sh

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+#Description : String testing.
+#Author : HuangYuhui
+#Date : January 10,2018
+
+#!/bin/bash
+
+#The common string manipulation symbols are as follows :
+# '<', '>' ,'==','=','=~','!=','-z','-n'
+
+#---------------------------------------------------------------------------------
+#In the Shell program,the zero means a Boolean value is true,1 or other is false.|
+#---------------------------------------------------------------------------------
+
+##
+##Attention : Use the system variable of '$!' can get the result of executing the sepcified command.
+##
+#Attention : The false grammar.
+[[ "abcd"=="a" ]]
+echo $?
+#The ture grammmer.
+[[ "abcd" == "a" ]]
+echo $?
+
+#The String can contrain wildcards.
+[[ "abcd" == abc* ]]
+echo $?
+
+#Compare the string.
+#The command : -z (If the string is empty It will return false)
+var=""
+##
+##Attention : The command name must be 'test' !
+##
+#For example : User the name of 'error'
+#error -z "var"
+#echo $? #It's will output : The command not found !
+#The ture grammar.
+test -z "$var" 
+echo $?
+#Or
+var="Shell"
+test -z "$var"
+echo $?
+
+#The command : -n (If the string is empty It Will return true)
+command_n=""
+test -n "$command_n"
+echo $?
+#Or
+command_n="Shell"
+test -n "$command_n"
+echo $?
+
+#The command : != 
+command_1="YUbuntu0109.github.io" #Ahhh ~ It's my websit address !
+command_2="GitHub.github.io"
+#The error grammar:o(╥﹏╥)o ~ What should i do ?! (I don't find the specified example in my book...)
+test $command_1 != $command_2
+#echo $?