tcler's blog --- 其实我是一个程序员
Show me your flowcharts and conceal your tables, and I shall continue to be mystified. Show me your tables, and I won’t usually need your flowcharts; they’ll be obvious.

edit countdown line how to in bash

12 Sep 2017

edit from first line to countdown 5th line

sed: sorry I don’t support countdown/negative line number

ed/ex: it doesn’t matter, we can!

#bash 脚本里，偶尔会遇到处理文件倒数第几行的需求，然而 sed 不支持倒数第几行的操作，，

#没有关系我们还有古老的 ed/ex 可以完美解决

ex -s <(seq 7)  <<< $'1,-5 s/$/,/ \n 1,$p \n'

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