s选项使ed静默地操作，并禁止所有正常输出。
The -s option makes Ed behave silently and suppresses all normal output.
c——屏蔽正常输出；相反，打印每个输入文件的匹配行数。
C — Suppress normal output; instead, print a count of matching lines for each input file.
电弧电压：一般认为电源正常输出电压即为切割电压。
Four, arc voltage: generally believe that the power supply is normal output voltage for cutting voltage.
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