cat,tac与rev命令 cat命令就不用说了,tac是cat的倒写,意思也和它是相反的。cat是从第一行显示到最后一行,而tac是从最后一行显示到第一行,而rev 则是把每行的最后一个字符显示到第一个字符。例如: [songbei6@localhost ~]$ cat file jj d s kk lop [songbei6@localhost ~]$ rev file s d jj kk pol [songbei6@localhost ~]$ tac file lop kk jj d s [songbei6@localhost ~]$ |
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