一.cd 切换目录 cd /etc 切换到/etc目录下 cd ~ 切换到主目录下 cd .. 返回上级目录 cd ../.. 返回上两级目录 cd - 返回进入此目录之前所在的目录 二.echo 输出 echo "this is a test!" 显示普通字符串: echo -e "\n" 输出一行空行,-e 开启转
1.scala shell命令 scala> :help All commands can be abbreviated, e.g., :he instead of :help. :edit <id>|<line> edit history :help [command] print this summary or command-specific help :history [num] show the history (optional num is commands t