Concat is a super simple cat command line util clone. It does not have all the features of cat.
USAGE:
concat [OPTIONS] [FILE]...
ARGS:
<FILE>... [default: -]
OPTIONS:
-b, --number-nonblank Number nonblank lines
-h, --help Print help information
-n, --number Number lines
-V, --version Print version information
$ concat -n file.txt