Linux in a Nutshell, Fifth Edition

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Chapter 6: The Bash Shell and Korn Shell

This is the Title of the Book, eMatter Edition

Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.

\v Vertical-tab character.

\\ Backslash.

\0nnn

ASCII character represented by octal number nnn, where nnn

is zero, one, two, or three digits and is preceded by a 0.

\nnn

ASCII character represented by octal number nnn, where nnn

is one, two, or three digits.

\xHH

ASCII character represented by hexadecimal number HH,

where HH is one or two hexadecimal digits.

-E Do not interpret escape sequences, even on systems where the

default behavior of the built-in echo is to interpret them.

-n Do not print the terminating newline.

Examples

$ echo "testing printer" | lp

$ echo "Warning: ringing bell \a"

echo

echo [-n] [string]

Korn shell version. Write string to standard output; if -n is speci-

fied, the output is not terminated by a newline. If no string is

supplied, echo a newline.

The Korn shell’s echo, even though it is built into the shell,

emulates the system’s version of echo. Thus, if the version found

by a path search supports -n, the built-in version does, too. Simi-

larly, if the external version supports the escape sequences

described below, the built-in version does, too; otherwise it does

not.

*

(See also echo in Chapter 3.) echo understands special escape

characters, which must be quoted (or escaped with a \) to prevent

interpretation by the shell:

\a