在BASH脚本中,`if with or`语句和`elif`语句都是用于条件判断的控制结构,但它们的使用场景和逻辑有所不同。 ### if with or 语句 `if with or`语句允许你...
bash 中的条件语句，基础就是 Test 。 if 先来个实例： x=5; if [ $x = 5 ]; then e...
你不需要for循环，也不需要[[...]]条件结构，你只需要模式匹配：
If you need to use one of the wildcard characters as an ordinary character, you make it literal or "escape it" by prefacing it with a backslash. So, if for some reason you had an asterisk as part of a file name—something you should never do intentionally—you could search for it ...
It could start with a single option and grow to a full set when there is demand or it seems worthwhile. Perhaps a single lexer.bash.styling.within.quotes to match lexer.baan.styling.within.preprocessor. Or lexer.bash.styling.inside.quotes. If there are multiple settings they should match ...
The rmdir command deletes (removes) a directory, but only if it's empty. If it's not empty, you get a warning instead. Fortunately, you can use the rm command to delete directories that aren't empty in combination with the -r (recursive) flag. The command would then look like so,...
mkdir 1stDirectory 2ndDirectory 3rdDirectoryYou can also use this to create parent directories at the same time with the -p (or --parents) flag. For instance, if you wanted a directory named 'project1' in another subdirectory at '/samples/bash/projects/', you could run:...
上面例子中,bash是文件,if是关键词。 快捷键 Bash 提供很多快捷键,可以大大方便操作。下面是一些最常用的快捷键,完整的介绍参见《行操作》一章。 Ctrl + L:清除屏幕并将当前行移到页面顶部。 Ctrl + C:中止当前正在执行的命令。 Shift + PageUp:向上滚动。
# find out if remote server supportsgzip/ mod_deflate or not # alias headerc = 'curl -I --compress' #16:增加安全性 # do not delete / or prompt if deleting more than 3 files at a time # alias rm = 'rm -I --preserve-root' ...
If your computer starts to lag, you can see which applications are using the most CPU power with this command: top This is generally the same information given as the GUI application 'System Monitor'. Check Devices USB Devices: If a USB device stops working, you may want to see if it ...