ECHO(1) General Commands Manual ECHO(1)

echo
print arguments

echo [-n] [string]…

Writes each string, separated by a single space (“ ”), to the standard output.

If -n is specified as the first argument, it's skipped. Otherwise, the newline character is written after all strings.

0 if no errors (like the output exceeding its quota) were encountered while writing, otherwise 1 and a diagnostic is issued.
June 7, 2021 voreutils 8252842