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Full Discussion: Echo's strange output
Top Forums Shell Programming and Scripting Echo's strange output Post 302836979 by royalibrahim on Thursday 25th of July 2013 02:12:38 AM
Old 07-25-2013
Echo's strange output

Hi,

Kindly help me to understand the behavior or logic of the below shell command
Code:
$ echo $!#
echo $echo $
$

Code:
$ echo !$#
echo $#
0

I am using GNU bash, version 3.2.25(1)-release

Last edited by royalibrahim; 07-25-2013 at 03:58 AM..
 

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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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