[ -f /tmp/testfile.log ] &&echo"File exists"||echo"File not exists" AI代码助手复制代码 2、bash shell:测试目录是否存在 有时我们需要在一个特定的目录中创建文件,或者需要目录。我们都应该确保该目录存在。例如,我们现在检查/ tmp / mydir是否存在。 #!/bin/bashif[ -d /tmp/mydir ]thenecho"Dir...
[student@studentvm1 testdir]$ File="TestFile1" ; echo "This is $File" > $File ; if [ -s $File ] ; then echo "$File exists and contains data." ; elif [ -e $File ] ; then echo "$File exists and is empty." ; else echo "$File does not exist." ; fi TestFile1 exists ...
Checking if a file or directory exists to perform a conditional task is a very common task one might want to achieve. Let's take a look at how that is done in Bash. The Bash shell has a few built-infile test operatorsand by using them you can perform these checks. Let's take a l...
$ln-s c.txt testlns #创建软链接时,发现已有同名的文件ln: failed to create symbolic link'testlns': File exists $ln--backup -s c.txt testlns #此时可以使用--backup选项备份已经存在的同名文件 $ ll #查看-rw-rw-r--.1ntrade ntrade991May1209:48c.txt lrwxrwxrwx.1ntrade ntrade5May1309:33...
PathFileExists 文件目录是否存在 大家好,又见面了,我是你们的朋友全栈君。if(!...PathFileExists(_T(“d:\\test”))) return NULL; 也可用CFileFinder查找文件是否存在。...PathFileExists可查看目录和文件。 1.6K20 在bash脚本中如何检查一个命令是否存在 问: 如何验证程序是否存在,以一种要么返回错误并退...
此方法将路径作为输入并测试用户的权限。...让我们看下面的示例,该示例使用fs.access()检查给定目录是否存在: const fs = require('fs'); // directory to check if exists const...'does not exist' : 'exists'}`); }); 查看本指南,以了解有关在Node.js应用程序中读写文件的更多信息。 11.8K1...
if (dir.exists("my_test_folder")) { print("The direcoty exists") } else { print("The file does not exist") } We get: [1] "The direcoty exists" Now, let’s do the following exercise. We will check if the directory exists and if not, then we will create a new one...
Shell 中test 单中括号[\] 双中括号[[]] test/[ ]判断 Linux test Command Tutorial for Beginners (with Examples) (howtoforge.com) Linux test command information and examples (computerhope.com) ...
${varname:-word} # if varname exists and isn't null, return its value; otherwise return word ${varname:=word} # if varname exists and isn't null, return its value; otherwise set it word and then return its value ${varname:+word} # if varname exists and isn't null, return ...
if[[ -e"file.txt"]];thenecho"file exists"fi 文件条件 更多条件 逻辑和,或 if["$1"='y'-a$2-gt 0 ];thenecho"yes"fiif["$1"='n'-o$2-lt 0 ];thenecho"no"fi Bash 循环 基本for 循环 foriin/etc/rc.*;doecho$idone 类似C 的 for 循环 ...