Test usage of shell scripts

#!/bin/bash
#1. Integer comparison operators
#整数变量和整数常量比较
Num1=15
["$num 1"-eq] #测试num1是否等于15
echo $? # #退出状态为0, means NUM1 equals 15

["$num 1"-eq] #测试num1是否等于20
echo $? # #退出状态为1, means num1 is not equal to 20

["$num 1"-lt] # #测试num1是否小于15
echo $? # #退出状态为1, indicating num1 not less than 15

["$num 1"-gt] # #测试num1是否大于15
echo $? # #退出状态为1, indicating NUM1 not greater than 15

# #两个整数变量比较
FIRST_NUM=99 # #深圳第一个变量为99
SECOND_NUM=100 # #设置第二个变量为100
["$first _num"-gt "$second _num"]
echo $? # #退出状态为1, stating that the variable First_num value is not greater than the variable Second_num value

["$first _num"-eq "$second _num"]
echo $? # #退出状态为1, stating that the variable first_num value is not equal to the variable second_num value

["$first _num"-lt "$second _num"]
echo $? # #退出状态为0, stating that the variable First_num value is less than the variable second_num value

#2. String operators
#字符串比较运算
Str1= ""
Test "$str 1"
echo $? # #退出状态为1, indicating that the string is empty

Test-n "$str 1"
echo $? # #退出状态为1, indicating that the string is empty

Test-z "$str 1"
echo $? # #退出状态为0, indicating that the string is empty

#比较两字符串是否相等
Type1= "VI"
Type2= "Vim"
["$type 1" = "$type 2"] # #测试变量type1是否等于type2
echo $? # #退出状态为1, stating that the variable type1 is not equal to the variable type2

["$type 1"! = "$type 2"] # #测试type1是否不等于type2
echo $? # #退出状态为0, which indicates that the variable type1 is not equal to the variable type2

# #空格造成测试结果不相等
str2= "Hello" # #赋值字符串变量str2为 "Hello"
["$str 2" = "Hello"] # #测试变量str2是否与 "Hello" equals
echo $? # #退出状态为1, stating that the variable str2 is not equal to "hello"

#大小写区分
str3= "Hello" # #赋值字符串str3为 "Hello"
["$STR 3" = "Hello"] # #测试变量str3是否与 "Hell" equals
echo $? # #退出状态为1, stating that the variable str2 is not equal to "hello"

# #变量弱化造成的赋值结果不同
var1= "007" # #给变量赋值, can be used as an integer or as a string
["$var 1" = "7"] # #测试变量var1的值是否等于字符串7
echo $? # #退出在为1, indicating that the value of the variable var1 is not equal to the string 7
["$var 1"-eq "7"] # #测试变量var1的值是否等于整数7
echo $? # #退出状态为0, which indicates that the value of the variable var1 equals the integer 7

#3. File operators
#判断输入的文件是目录还是目录
LS # #显示当前目录下的所有文件
[-D File_exam] # #测试file_exam是否是目录
echo $? # #退出状态为1, description File_examp is not a directory
[-F File_exam] # #测试file_exam是否是文件
echo $? # #测试结果为0, Description File_exam is a file

# #测试文件是否存在
Ls
[-E File_exam] # #测试file_exam是否存在
echo $? # #突出状态为0, not file File-exam exist
[-E file_exam1] # #测试文件file_exam1是否存在
echo $? # #退出状态为1, indicating that the file file_exam1 does not exist

# #测试文件权限
Ls-l
[-R File_exam] # #测试文件是否可读
echo $?
[-W File_exam] # #测试文件是否可写
echo $?
[-X File_exam] # #测试文件是否执行
echo $?

# #显示通过chmod命令增减文件权限
Ls-l
[-X File_exam] # #测试文件file_exam是否可执行
echo $? # #退出状态为1, description file File_exam not executable
chmod a+x File_exam # #给文件file_exam增加可执行权限
[-X File_exam] # #再次测试文件file_exam是否可执行
echo $? # #退出状态为0, indicates that the file File_exam is now executable

# #4. Logical operators
#逻辑非
Ls
[!-e File_exam] # #使用逻辑非测试一个存在的文件
echo $? # #腿子状态为1, the description file File_exam does not exist is false
[!-e File_exam] # #使用逻辑非测试一个不存在的文件
echo $? # #退出状态为0, the description file File_exam exists is false

# #逻辑与
Ls-l
[-E File_exam-a-x file_exam] # #测试文件file_exam是否存在且可执行
echo $? # #退出状态为0, stating that the file File_exam exists and is executable
chmod a-x File_exam # #将文件file_exam的可执行权限去除
Ls-l
[-E File_exam-a-x file_exam] # #再次测试文件file_exam是否存在且可执行
echo $? # #退出状态为1, stating that the file File_exam does not exist or is not executable

# #逻辑或
Integer1=15
["$integer 1"-lt 20-o "$integer 1"-gt "# #测试整数变量integer1是否小于20或大于30
echo $? # #退出状态为0, representing integer variables with an integer less than 20 or greater than 30

["$integer 1"-lt 10-o "$integer 1"-gt] # #测试整数变量integer1是否小于10或大于20
echo $? # #测试状态为1, which indicates that the integer variable integer1 is greater than 10 and less than 20

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Test usage of shell scripts