if [ -e "/path/to/file" ]; then echo "File exists." else echo "File does not exist." fi 在这个语法中：[ -e "/path/to/file" ] 检查指定路径下的文件是否存在。这种方法被广泛使用，对于 Bash 脚本中的基本文件存在检查非常有效。与传统的 [ .. .]命令相比
1. Check Empty String 1 2 3 4 5 6 1. 2. 3. 4. 5. 6. if [[ -z "$emptyString" ]]then echo "Empty"else echo "Not Empty"fi 1. Here is a reference material from Stackoverflowhttp://stackoverflow.com/questions/3767267/check-if-file-exists 1 2 3 4 5 6 7 8 ...
Check if the directory still exists The -d operator allows you to test if a file is a directory. For example, to check if the /etc/filetocheck directory exists, you can use: NOTE: You can also use double brackets [[ instead of [ single brackets. Check if the file doesn’t exist ...
if [ -f $file ] then echo "File exists" else echo "File does not exist" fi # Check if a command is successful if ls then echo "Command succeeded" else echo "Command failed" fi ``` 通过使用if-else语句,用户可以根据不同的条件执行不同的操作。这使得Bash脚本更加灵活和强大,可以满足各种不...
在Bash Shell中,可以使用复合条件来在一个if语句中检查多个条件。复合条件主要有两种形式:逻辑与(&&)和逻辑或(||)。 1. 逻辑与(&&): - 概念:逻辑与用于同时检查多个条件...
-f myFile ]] && { echo "File not found"; false; } || { echo "File exist"; true; } File not found File exist # WRONG: All arithmetic expansions are executed and return incorrect z value [me@linux ~]$ z=0; [[ -v z ]] && ((z++)) || ((z--)); echo $z 0 # ...
在bash中,只有变量的if语句会计算到什么? 、、 我正在学习bash --登录,并看到/etc/profile中的命令是首先执行的。$i donefi 当然,我对bash中的控制流有一个有限的理解,但根据我的理解,我在if语句中看到的大多数情况都是某种条件语句,是否是[-a FILENAME]来检查文件是否存在或字符串之间的</ 浏览0提问于201...
Each operating system executes programs, which exist in the form of files. In Linux, we run binary executables and many types of scripts. Hence,the executable files are marked in a special way for the system to recognize them.However, a quite different matter is to checkif the file actually...
if [ -f "$MyFile" ]; then echo "$MyFile exists." else echo "$MyFile does not exist." fi Running the script results in the following output: 22. Check Inodes and Disk Usage Inodes represent data units on a physical or virtual server. Each text file, video, folder, HTML file, or...
if [ "$name" == "Alice" ] then echo "Hello, Alice!" else echo "You are not Alice." fi Example 3: File Check #!/bin/bash file_path="/path/to/file.txt" if [ -f "$file_path" ] then echo "File exists." else echo "File does not exist." ...