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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) 							   User Commands							   ECHO(1)

NAME
echo - display a line of text SYNOPSIS
echo [SHORT-OPTION]... [STRING]... echo LONG-OPTION DESCRIPTION
Echo the STRING(s) to standard output. -n do not output the trailing newline -e enable interpretation of backslash escapes -E disable interpretation of backslash escapes (default) --help display this help and exit --version output version information and exit If -e is in effect, the following sequences are recognized: \ backslash a alert (BEL)  backspace c produce no further output e escape f form feed new line carriage return horizontal tab v vertical tab NNN byte with octal value NNN (1 to 3 digits) xHH byte with hexadecimal value HH (1 to 2 digits) NOTE: your shell may have its own version of echo, which usually supersedes the version described here. Please refer to your shell's docu- mentation for details about the options it supports. GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report echo translation bugs to <http://translationproject.org/team/> AUTHOR
Written by Brian Fox and Chet Ramey. COPYRIGHT
Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. 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 coreutils 'echo invocation' should give you access to the complete manual. GNU coreutils 8.22 June 2014 ECHO(1)
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