/usr/bin/rev

rev

/usr/bin/rev

실행예시

[root@zetawiki ~]# echo hello > hello.txt
[root@zetawiki ~]# rev hello.txt
olleh

[root@zetawiki ~]# rev /etc/issue
)laniF( 3.6 esaeler SOtneC
m\ na no r\ lenreK