test -h /bin/bash && echo $? || echo $? test -L /bin/bash && echo $? || echo $? test -b /bin/bash && echo $? || echo $? test -c /bin/bash && echo $? || echo $? #!/usr/bin/env bash [ -e /bin/bash ] && echo $? || echo $? [ -f /bin/bash ] && echo...
#!/bin/bash if test –d ~/tmp then echo “the directory already exists” else mkdir ~/tmp fi 试说明该代码段主要实现了什么功能?相关知识点: 试题来源: 解析 答:该代码段主要实现的功能为:判断用户主目录下的子目录tmp是否存在,并根据判断结果做出如下处理: 存在: 显示“the directory already exists”...
bash if [ -f "/path/to/file" ]; then echo "file exists" fi if [ -d"/path/to/directory" ]; then echo "directory exists" fi if [ -r "/path/to/file" ]; then echo "file is readable" fi if [ -w "/path/to/file" ]; then echo "file is writable" fi 七、使用逻辑操作符 ...
echo "The file: $1 exists." if [ -d "$1" ] then echo "And it's a directory." fi if [ -f "$1" ] then echo "And it's a file." fi else echo "The file: $1 does not exist." fi # ./example10.sh directory 结果为: #The file: directory exists. #And it's a directory...
/bin/bashif[ -d $HOME ]thenecho"Your HOME directory exists"cd $HOMEls-aelseecho"There is a problem with your HOME directory"fi 上面代码使用了-d测试条件来检查用户的$HOME目录是否存在。如果它存在的话,它将继续使用cd命令来切到$HOME目录并进行显示目录下的文件。
/bin/bash #如果检测的目录存在,就进入到该目录,并显示所有内容 if[ -d $HOME ] then echo"Your HOME directory exists" cd$HOME ls-a else echo"There is a problem with your Home directory" fi 复合条件测试 常见命令行参数符号 $# 参数的个数,不包括命令本身 -o 逻辑...
/bin/bash str1="str1" str2="str2" str3="" if test -z $str3 then echo "长度为0" # 打印 else echo "长度不为0" fi if test $str1 = $str2 then echo "字符串相等" else echo "字符串不相等" # 打印 fi 文件测试 -e 文件名 如果文件存在则为真 # e: exists...
new test: nfs07.sh - NFS directory listing regression DOWNLOAD AND LINKS The latest version of the test-suite contains 3000+ tests for the Linux and can be downloaded at: https://github.com/linux-test-project/ltp/releases/tag/20220121 The project pages as well as GIT repository are hosted...
✅Do:The server under test should let the test decide when to open the connection and when to close it. If the webserver do this alone automatically when its file is imported, then the test has no chance to perform important actions beforehand (e.g. change DB connection string). It al...
Example no. 1: Using the if –e Text Operator In this example, we will try to use the if –e test operator which is mainly used to verify whether the file exists in a directory or not. Now, we will first create a new file. ...