for f in /path/to/your/files*; do ## Check if the glob gets expanded to existing files. ## If not, f here will be exactly the pattern above ## and the exists test will evaluate to false. [ -e "$f" ] && echo "files do exist" || echo "files do not exist" ## This is ...
if [ -f $file ] then echo "File exists" else echo "File does not exist" fi # Check if a command is successful if ls then echo "Command succeeded" else echo "Command failed" fi ``` 通过使用if-else语句,用户可以根据不同的条件执行不同的操作。这使得Bash脚本更加灵活和强大,可以满足各种不...
/bin/bashecho“Current absolute file path name is:$_”echo“$-“echo“Second$_”letcnt=1echo“Third$_”echo“$cnt”echo“Fourth$_” 执行命令: ./test_3.sh 输出的结果是: Current absolute file path name is: ./test_3.sh hB Second hB Third cnt=1 1 Fourth 1 解释如下: 由于我们是在当...
使用[ -f file ]条件语句: 代码语言:txt 复制 if [ -f file ]; then echo "文件存在" else echo "文件不存在" fi 这两种方法都会检查指定的文件是否存在,并根据结果输出相应的信息。 Jenkins Pipeline是一种用于定义和管理持续交付流水线的插件。它允许开发人员通过脚本语言(如Groovy)来编写构建和部署流程。
pi:x:1000:1000:,,,:/opt/wwwroot:/bin/bash 使用’-i'选项将忽略大小写。 1 2 root@raspberrypi:/opt/labpark# grep -i'PI'/etc/passwdpi:x:1000:1000:,,,:/opt/wwwroot:/bin/bash 使用’-r'选项递归搜索所有自目录下包含字符串 “localhost“.的行。 1 2 3 4...
File exists(文件已存在) In this case, you probably tried to create a file that already exists. This is common when you try to create a directory with the same name as a file. 在这种情况下,您可能尝试创建一个已经存在的文件。当您尝试以与文件同名的方式创建一个目录时,这种情况很常见。
Now let’s perform a similar check,but with thetest [command: $ if [ -x a.out ]; then echo "File is executable"; else echo "File is not executable"; fi File is executable So, thetest‘sxflag proves if the file exists and is executable. ...
bash Does demo.txt exists False Method-2: Using os.path.isfile() function One more method of os.path module can be used to check for the existence of file. Here also, we will first need to import os.path module. The syntax of isfile() method is as shown below. Here, path is a...
# wget-url-check.shHTTP/1.1200OKGoogle.com is up 如果你想看多个网站的状态,使用下面的 shell 脚本: 代码语言:javascript 复制 # vi curl-url-check-1.sh #!/bin/bashforsiteinwww.google.com google.co.in www.xyzzz.comdoifwget--spider-S"$site"2>&1|grep-w"200\|301";then echo"$site is...
/bin/bash # Testing nested ifs # testuser=NoSuchUser #设置变量用户名 # if grep $testuser /etc/passwd #查询 then #状态码0,执行 echo "The user $testuser exists on this system." else #否则,执行 echo "The user $testuser does not exist on this system."...