echo - display a line of text

echo [SHORT-OPTION]... [STRING]...
echo LONG-OPTION

Echo the STRING(s) to standard output.

-n

do not output the trailing newline

-e

enable interpretation of backslash escapes

-E

disable interpretation of backslash escapes (default)

--help

display this help and exit

--version

output version information and exit

If -e is in effect, the following sequences are recognized:

\\

backslash

\a

alert (BEL)

\b

backspace

\c

produce no further output

\e

escape

\f

form feed

\n

new line

\r

carriage return

\t

horizontal tab

\v

vertical tab

\0NNN

byte with octal value NNN (1 to 3 digits)

\xHH

byte with hexadecimal value HH (1 to 2 digits)

NOTE: your shell may have its own version of echo, which usually supersedes the version described here. Please refer to your shell's documentation for details about the options it supports.

NOTE: printf(1) is a preferred alternative, which does not have issues outputting option-like strings.

printf(1)

Full documentation <https://www.gnu.org/software/coreutils/echo>
or available locally via: info '(coreutils) echo invocation'