标题是我想要的概括。具体问题：给定一些输出多个时间戳的命令，例如：
$ cat timestamps | sort -n
1508349271820
1508349271821
1508349425222
1508349425223
1508349454218
1508349476419
1508349500018
1508349500020
1508349698820
1508349698822
1508350047721
1508350047724
1508351635621
1508351635623
1508351699618
1508351699620
1508351699621
1508351699622
1508351699623
1508352230120
1508352230123
1508352230124
1508352230125
1508352232219
1508352232220
1508352364919
1508352364920
1508352387618
1508352387619
我想计算每个 2 差异。我最终做了类似的事情：
$ wc -l timestamps
29
cat <(sort -n timestamps | head -28) <(sort -n timestamps | tail -28) | sort -n | xargs -n 2 sh 'calc $2 - $1' sh
1
153401
1
28995
22201
23599
2
198800
2
348899 …