风焱

   移动光标h将光标左移一格。l将光标右移一格。k或Ctrl+p光标上移一行 j或Ctrl+n 光标下移一行 w将光标移到下一个小字的前面。W将光标移到下一个大字的前面。b将光标移到前一个小字的前面。B将光标移到前一个大字的前面。e将光标移到下一个小

1 单引号和双引号的区别单引号严格一些。它可以防止任何变量扩展。双引号可以防止通配符扩展但允许变量扩展。2 Use case to select OS type  # Moved shell code from .machtype into here so that one less process  # is executed.  PLATFORM="unknown"  if [ -f /u

A at : execute commands at a specified time/date. awk: a scripting language, especially useful for manipulating text and automation. B bash : invokes the Bourne Again Shell (standard on most boxes). b