file_path=/var/scripts/migratedb.sh if [ -e "$file_path" ]; then echo "The file exists." else echo "The file does not exist." fi If-elif-else Statement 在bash 脚本中,如果希望使用 if 语句应用多个条件,则使用 if elif else。在这种类型的条件语句中,如果满足第一个条件,则执行下面的代码...
使用 if-else 检查文件是否存在 #!/bin/bash file_path=/var/scripts/migratedb.sh if [ -e "$...
-b file True if file exists and is a block special file. -c file True if file exists and is a character special file. -d file True if file exists and is a directory. -e file True if file exists. (Not avail- able in sh.) -f file True if file exists and is a regular file....
[ FILE1 -nt FILE2 ] 如果 FILE1 has been changed more recently than FILE2, or 如果 FILE1 exists and FILE2 does not则为真。 [ FILE1 -ot FILE2 ] 如果 FILE1 比 FILE2 要老, 或者 FILE2 存在且 FILE1 不存在则为真。 [ FILE1 -ef FILE2 ] 如果 FILE1 和 FILE2 指向相同的设备和节...
If File exists then copy it script powershell If is not recognized as the name of a cmdlet? if not contains If statement based on day of the week evaluating despite being false If Test-Connection do these action else exit. If variable is null or empty skip in script If with multiple ...
When you are working on a shell script inbash, there are cases where you want to check if a particular file exists (or does not exist) in a directory, and then perform an action based on the condition. Inbash, there are several ways to check whether or not a file exists inbash. In...
file=”/etc/passwd” if [ -e $file ] then echo “$file exists.” else echo “$file does not exist.” fi “` 五、多条件判断 在实际编程中,我们可能需要同时判断多个条件,可以使用逻辑运算符进行组合。以下代码演示了如何使用逻辑与(&&)、逻辑或(||),以及逻辑非(!)进行多条件判断: ...
echo "The file /etc/fstab exists." else echo "The file /etc/fstab does not exist." fi ``` 在这个例子中,if语句判断/etc/fstab文件是否存在,如果存在则输出一条提示信息,否则输出另一条提示信息。这种条件判断和操作的结构在Shell脚本中应用广泛,帮助用户做出智能决策和自动化执行任务。
id$UserName&>/dev/null&&useradd$UserName||echo"$UserNameexists."#如果用户存在,则 && 前的部分为假,那么需要判断&& 后面的部分;#如果用户不存在,则 &&前面的部分为真,那么不需要判断&& 后面的部分#对于 || 运算来说,如果用户不存在,则前半部分都为假,则需要运行 || 后面的部分...
Or how do I see if a file exists? How will a user distinguish if the mentioned path is a directory or a file? So, let’s have some examples in a Bash script to elaborate on this concept. Make sure to log in from your system first. We are utilizing Ubuntu 20.04. After the login...