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Full Discussion: To quote or not
Top Forums UNIX for Dummies Questions & Answers To quote or not Post 302844145 by Corona688 on Friday 16th of August 2013 04:37:03 PM
Old 08-16-2013
Quote:
Originally Posted by g.j.huebschman
I can also see that I don't understand the difference between the shell expanding the wildcards and the command expanding the wildcards.
When in doubt, see what it does when you feed it into echo. If anything gets changed, it's the shell that's doing it, not echo, because echo is stupid and dumb and translates nothing.

Code:
$ touch abcdefg # Create empty file
$ echo a* # Shell turns a* into abcdefg BEFORE echo is run
abcdefg

$ echo "a*" # Quotes prevent the shell from changing it
a*

$ rm abcdefg # Remove file, so its no longer found
$ echo a* # Since there are no files beginning with a, the shell leaves it as a*
a*

$


Last edited by Corona688; 08-16-2013 at 05:42 PM..
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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.10 3 Aug 1994 echo(1B)
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