linux管道命令中的条件判断
1.如果文件存在,则执行命令A,否则执行命令B。
If the file exists, execute command A; otherwise, execute command B.
2.当前目录中文件的数量大于10,则输出“文件数量过多”,否则输出“文件数量正常”。
If the number of files in the current directory is greater than 10, output "Too many files"; otherwise, output "Normal number of files".
3.判断变量a是否等于变量b,若相等则输出“相等”,否则输出“不相等”。
Check if variable a is equal to variable b; if they are equal, output "Equal"; otherwise, output "Not equal".
4.如果目录为空,则输出“目录为空”,否则输出“目录不为空”。
If the directory is empty, output "The directory is empty"; otherwise, output "The directory is not empty".
5.判断文件的权限,若有写权限则输出“可写”,否则输出“不可写”。
Check the file permissions; if there is write permission, output "Writable"; otherwise, output "Not writable".
6.如果字符串包含特定的关键词,则输出“包含关键词”,否则输出“不包含关键词”。
If the string contains a specific keyword, output "Contains keyword"; otherwise, output "Does not contain keyword".
7.比较两个数字的大小,若数字a大于数字b,则输出“a大于b”,否则输出“a小于b”。
Compare two numbers; if number a is greater than number b, output "a is greater than b"; otherwise, output "a is less than b".
8.判断文件是否是一个目录,若是则输出“是目录”,否则输出“不是目录”。
Check if the file is a directory; if it is, output "It is a directory"; otherwise, output "It is not a directory".
9.如果输入的参数个数大于3,则输出“参数过多”,否则输出“参数正常”。
If the number of input parameters is greater than 3, output "Too many parameters"; otherwise, output "Normal parameters".
10.判断文件是否存在且大小不为0,若满足则输出“文件存在且非空”,否则输出“文件不存在或为空”。
Check if the file exists and is not empty; if true, output "File exists and is not empty"; otherwise, output "File does not exist or is empty".
11.如果变量a小于等于0,则输出“a小于等于0”,否则输出“a大于0”。
If variable a is less than or equal to 0, output "a is less than or equal to 0"; otherwise, output "a is greater than 0".
12.检查目录是否可读,若可读则输出“目录可读”,否则输出“目录不可读”。
Check if the directory is readable; if it is, output "Directory is readable"; otherwise, output "
Directory is not readable".
13.如果字符串长度大于20,则输出“字符串过长”,否则输出“字符串长度正常”。
If the length of the string is greater than 20, output "String is too long"; otherwise, output "String length is normal".
14.判断文件是否可执行,若可执行则输出“文件可执行”,否则输出“文件不可执行”。
Check if the file is executable; if it is, output "File is executable"; otherwise, output "File is not executable".
15.如果变量a等于变量b,且变量c不等于变量d,则输出“条件成立”,否则输出“条件不成立”。
If variable a is equal to variable b, and variable c is not equal to variable d, output "Condition is satisfied"; otherwise, output "Condition is not satisfied".
字符串长度判断16.检查文件是否为常规文件,若是则输出“是常规文件”,否则输出“不是常规文件”。
Check if the file is a regular file; if it is, output "It is a regular file"; otherwise, output "It is not a regular file".

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