Bash 会对select依次进行下面的处理。select生成一个菜单,内容是列表list的每一项,并且每一项前面还有一个数字编号。 Bash 提示用户选择一项,输入它的编号。 用户输入以后,Bash 会将该项的内容存在变量name,该项的编号存入环境变量REPLY。如果用户没有输入,就按回车键,Bash 会重新输出菜单,让用户选择。 执行命令体co
bash脚本编程之用户交互:read [option]… [name …] -p ‘PROMPT’ -t TIMEOUTbash-n /path/to/some_script 检测脚本中的语法错误bash-x /path/to/some_script 调试执行 示例:&nb bash脚本 自动输入yes bash i++ 控制变量 转载 blueice 1月前 ...
declare-r name[=value] 以上选项可以使用命令declare +OPTION name撤销变量name的属性(只读变量除外) 内置命令export作用于赋值语句时,和declare -x类似表示导出变量为环境变量(临时有效,重启系统后这些环境变量消失;如需设置永久环境变量,需要将export语句写入前面所述的bash配置文件中)。 内置命令readonly作用于赋值语...
BASH 中提供了一个小的语句格式,可以让程序快速的设计出一个字符界面的用户交互选择的菜单,该功能就是由 select 语句来实现的,select 语句的语法为: select var in 上面的语法结构在执行后,BASH 会将 #!/bin/bash OPTIONS="Hello Quit" select opt in $OPTIONS; do if [ "$opt" = "Quit" ]; then ech...
问在目录中查找文件夹，然后将它们作为bash脚本中的选项列出EN例子 ./cidr-to-ip.sh [OPTION(only ...
Similarly for example we can use while loop to check if file does not exists. This script will sleep until file does exists. Note bash negator "!" which negates the -e option. #!/bin/bash while [ ! -e myfile ]; do # Sleep until file does exists/is created ...
select opt in $OPTIONS; do if [ "$opt" = "Quit" ]; then echo done exit elif [ "$opt" = "Hello" ]; then echo Hello World else clear echo bad option fi done exit 0 大家可以试着执行上面的程序,看看是什么执行结果。 4.3 在 BASH 中读取用户输入 ...
Additionally to the extdebug option, you can call the bash debugger directly from the command line using one of the command below: bashdb [options] [--] script-name [script options] bashdb [options] -c execution-string bash --debugger [bash-options...] script-name [script options] ...
case $OPTION in h) usage exit;; ?) usage exit;; esac done if [ -z "${file}" ] then file="/etc/ssh/sshd_config" fi backup_sshd_config edit_sshd_config reload_sshd The script starts with the shebang and some lines of comments. I like to use comments at the top to briefly des...
Though be careful if your shell script runs with the set -u option and your variable does not exist, then your script will fail with an error like bash: myVar: unbound variable. To work around this, you can test with a parameter expansion by using ${parameter:+word} to ensure that ...