值得一提的shell命令
tac命令# cat 1.txt
1
2
3
4
5
# tac 1.txt
5
4
3
2
1
rev命令
# cat 1.txt
1234567
# rev 1.txt
7654321
join命令
# cat 1.txt
1 aaa
2 bbb
3 ccc
# cat 2.txt
1 eee
2 fff
3 ggg
# join 1.txt 2.txt >3.txt
# cat 3.txt
1 aaa eee
2 bbb fff
3 ccc ggg
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