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...
使用if else bash脚本检查变量是否存在 我尝试编写一个非常简单的bash脚本文件,名为bash_script.sh。 echo $1 echo 'no variable'在终端中,我尝试运行./bash_script.sh hello,但是终端上的输出是no variable。我在这里做错了什么? 浏览1提问于2021-08-18得票数 1 回答已采纳 1回答 如何检查环境变量是否设置...
man test man expr help for help if help case … 检查变量类型(属性) declare -p <varName> 配置命令别名(alias dtype="declare -p") ...
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=...
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. ...
/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$(
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. ...
$cattest3.sh#!/bin/bashPS4='LINENO:'set-xecho"hello World"mkdiir testing You can easily see the line number while reading the errors: $ /test3.sh5:echo'hello World'hello World6: mkdiir testing ./test3.sh: line6: mkdiir:commandnot found ...