case$VARin normal) echo"This doesn't do fallthrough" ;; fallthrough) echo-n"This does" ;& somethingelse) echo"fall-through" ;; esac 相关讨论 谢谢(你的)信息。不过,我会更改第三种情况的"名称",例如到somethingElse。 使用;&不是非常便携,因为它需要bash(不是ash,dash或任何其他最小sh)并且它至...
也可以把select命令 和case命令结合使用,select命令获取用户选择的项,case命令根据用户选择的不同项进行不同的处理。这里不再举例。
1.Vim的使用 一般指令模式:vim进去模式的模式 编辑模式:在一般模式下按 “i, I, o, O, a, A, r, R” 可以进入编辑模式 命令行命令模式:在一般模式下输入 “: / ?” 任意一个,可以将光标移动到最下面那一列 vim fileName可以新建一个文件,编辑完后按ESC输入:wq即可完成编辑且退出,若文件权限不对无法...
从设置>更新（Settings > Updates），安全>开发者（Security > For Developers）打开新的设置页面，选择...
[root@VM-20-9-centos ~]# cat fileTemp | nl 1 Line 9: Expected a default case default-case 2 Line 20: Expected a 'break' statement before 'case' no-fallthrough 3 Line 30: Expected a 'break' statement before 'case' no-fallthrough 4 Line 48: Expected a default case default-case ...
Using ;;& in place of ;; causes the shell to test the next pattern list in the statement, if any, and execute any associ- ated list on a successful match. The exit status is zero if no pattern matches. Otherwise, it is the exit status of the last command executed in list. fi ...
Using a case statement:case "$var" in *sub_string*) # Do stuff ;; *sub_string2*) # Do more stuff ;; *) # Else ;; esacCheck if string starts with sub-stringif [[ $var == sub_string* ]]; then printf '%s\n' "var starts with sub_string." fi # Inverse (var does not ...
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When the shell reads input, it proceeds through a sequence of operations. If the input indicates the beginning of a comment, the shell ignores the comment symbol (‘#’), and the rest of that line. Otherwise, roughly speaking, the shell reads its input and divides the input into words an...
In the context where an assignment statement is assigning a value to a shell variable or array index, the += operator can be used to append to or add to the variable's previous value. When += is applied to a variable for which the integer attribute has been set, ...