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Full Discussion: slashes in a bash shell
Top Forums Shell Programming and Scripting slashes in a bash shell Post 10568 by Perderabo on Friday 16th of November 2001 10:35:30 AM
Old 11-16-2001
Backslash is special to the shell. It quotes the next character. For example:
echo ;
will not work because the shell sees the semicolon as a separator and will not pass it to the echo command. So to echo a semicolon we need to do:
echo \;
But what if we wanted to echo a backslash? We then we need to do this:
echo \\

So your four backslashes are needed just to deliver two backslashes to the sed program.

But sed also uses the backslash specially. And so if you really want sed to use a backslash as an ordinary character, you need to feed sed a double backslash as well.

If it makes you feel any better, 8 backslashes is no record.
 

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LEARN ABOUT REDHAT

echo

ECHO(1) 								FSF								   ECHO(1)

NAME

       echo - display a line of text

SYNOPSIS

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

DESCRIPTION

       NOTE:  your shell may have its own version of echo which will supercede the version described here. Please refer to your shell's documenta-
       tion for details about the options it supports.

       Echo the STRING(s) to standard output.

       -n     do not output the trailing newline

       -e     enable interpretation of the backslash-escaped characters listed below

       -E     disable interpretation of those sequences in STRINGs

       --help display this help and exit

       --version
	      output version information and exit

       Without -E, the following sequences are recognized and interpolated:

       NNN   the character whose ASCII code is NNN (octal)

       \     backslash

       a     alert (BEL)

            backspace

       c     suppress trailing newline

       f     form feed

       
     new line

       
     carriage return

       	     horizontal tab

       v     vertical tab

AUTHOR

       Written by FIXME unknown.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The  full documentation for echo is maintained as a Texinfo manual.  If the info and echo programs are properly installed at your site, the
       command

	      info echo

       should give you access to the complete manual.

GNU coreutils 4.5.3						   February 2003							   ECHO(1)
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