command: rev
usage: reverse lines of a file or files
syntax: $ rev [-V] [-h] [file ...]
examples:
1. To print options and help of this command
$ rev --help
2. To print Reverse the order of characters in every line
$ cat rev.txt
Quick brown fox jumps over the lazy dog
$ rev rev.txt
god yzal eht revo spmuj xof nworb kciuQ
regards,
dhanasekar
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