cat [options] [files]

Read (concatenate) one or more files and print them on standard output. Read standard input if no files are specified or if - is specified
as one of the files; input ends with EOF. You can use the > operator to combine several files into a new file, or >> to append
files to an existing file. When appending to an existing file, use Ctrl-D, the end-of-file symbol, to end the session.

Linux Commad Options:
-A, --show-all
Same as -vET.
-b, --number-nonblank
Number all nonblank output lines, starting with 1.
-e Same as -vE.
-E, --show-ends
Print $ at the end of each line.
-n, --number
Number all output lines, starting with 1.
-s, --squeeze-blank
Squeeze down multiple blank lines to one blank line.

-t Same as -vT.
-T, --show-tabs
Print TAB characters as ^I.
-u Ignored; kept for Unix compatibility.
-v, --show-nonprinting
Display control and nonprinting characters, with the exception of LINEFEED and TAB.

Examples:

cat ch1                       Display a file

cat ch1 ch2 ch3 > all    Combine files

cat note5 >> notes       Append to a file

cat > temp1                 Create file at terminal. To exit, enter EOF Ctrl-D).

cat /proc/partitions        Show all partitions registered on the system