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"echo" and "cat" are two commands.

Two completely different commands, which do two entirely different things.

Quote:

man echo

NAME
echo - display a line of text

SYNOPSIS
echo [OPTION]... [STRING]...

Quote:

NAME
cat - concatenate files and print on the standard output

SYNOPSIS
cat [OPTION] [FILE]...

DESCRIPTION
Concatenate FILE(s), or standard input, to standard output.

EXAMPLES:

Code:

echo cat

cat



cat echo

cat: echo: No such file or directory

The first example just "echoed back" what I typed - the letters "c", "a" and "t"

The second example tried to print the contents of the file "echo". But there was no such file "echo" - hence the error.

'Hope that helps