Echo writes its arguments separated by blanks and
terminated by a newline on the standard output.
Echo is useful for producing diagnostics in shell programs
and for writing constant data on pipes. To send diagnostics to the standard
error file, do `echo ... 1>&2'.
The following escapes sequences are recognized in the
arguments:
- \a
- Prints an alert character (/usr/5bin/posix/echo and
/usr/5bin/posix2001/echo only).
- \b
- Prints a backspace character.
- \c
- Causes the command to return immediately. Any following characters are
ignored, and the terminating newline is not printed.
- \f
- Prints a formfeed character.
- \n
- Prints a newline character.
- \r
- Prints a carriage-return character.
- \t
- Prints a tabulator character.
- \v
- Prints a vertical tabulator character.
- \\
- Prints a backslash character.
- \0nnn
- Prints the character (byte) with octal value nnn.
- LANG,
LC_ALL
- See locale(7).
- LC_CTYPE
- Determines the scope of backslash as an escape character.
- SYSV3
- If this variable is set and the first argument is -n, the
terminating newline is not printed.
It is recommended for portability that printf(1) is used
instead of echo if backslashes are to be printed or if the trailing
newline is to be omitted.