echo "This script needs at least $MINPARAMS command-line arguments!" fi echo exit 0 运行代码: bash test30.sh 1 2 10 The name of this script is "test.sh". The name of this script is "test.sh". Parameter #1 is 1 Parameter #2 is 2 --- All the command-line parameters are: 1 ...
Here, we will list some helping testing operators for permissions, size, date, file type, or existence in the bash script. Operators Explanation -e To test if a file exists. -f To test if a given file is a regular file. -d To test if the file is a directory. -b To test if the...
-b FILE :是否存在并且为块设备文件 -c FILE :是否存在并且为字符设备文件 -d FILE :是否存在并且为目录文件 -f FILE :是否存在并且为普通文件 -h FILE :是否存在并且为符号链接文件 -L FILE :是否存在并且为符号链接文件,大写"L"。 -p FILE :是否存在并且为命名管道文件 -S FILE :是否存在并且为套接字...
9. if [grep foo myfile] 初学者会错误地认为,[是 if 语法的一部分,正如 C 语言中的 if ()。但是事实并非如此,if 后面跟着的是一个命令,[是一个命令,它是内置命令 test 的简写形式,只不过它要求最后一个参数必须是]。下面两种写法是一样的: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 #POSIX...
(a) 如果文件/var/lock/subsys/script.sh文件存在,则显示“running”; (b) 否则,则显示为"stopped" (6) 其它任意参数,均显示帮助信息后退出;帮助信息格式为命令使用格式; AI检测代码解析 #!/bin/bash # # chkconfig: 2345 95 5 # description: test service script 此两行为开机启动脚本格式;可以cp到脚本...
/bin/bash#查找最大文件a=0fornamein*.*dob=$(ls-l$name| awk'{print $5}')iftest$b-ge$athena=$bnamemax=$namefidoneecho"the max file is$namemax" ### 9.批量修改文件名 bEditFilename.sh #!/bin/bash#批量修改文件名forfilein$(
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. ...
The if in a Bash script is a shell keyword that is used to test conditions based on the exit status of a test command. An exit status of zero, and only zero, is a success, i.e. a condition that is true. Any other exit status is a failure, i.e. a condition that is false. ...
Example Usage in script:is_hex_color() { if [[ $1 =~ ^(#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3}))$ ]]; then printf '%s\n' "${BASH_REMATCH[1]}" else printf '%s\n' "error: $1 is an invalid color." return 1 fi } read -r color is_hex_color "$color" || color=...
The script takes user input in the form of a string value, which represents the file name that is to be checked. By using the "test" command, the script can quickly and easily determine whether the file exists or not. The script outputs a message indicating the result of the check, ...