首先，tput提供了以下一些附加功能：提取终端信息(如设备，列数和行数)和清除屏幕上的数据。
First, here are some additional features that tput provides: extracting terminal information such as the devices, the number of columns and rows, and clearing data from the screen.
到目前为止所讨论的ps命令仅列出从终端会话启动的进程(注意清单14中的第二个例子的sid列，即会话id列)。
The ps commands discussed so far only list processes that were started from your terminal session (note the SID, or session id, column in the second example of Listing 14).
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