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Top Forums Shell Programming and Scripting Can I export vars without polluting my namespace? Post 302075654 by tphyahoo on Tuesday 6th of June 2006 06:10:01 AM
Old 06-06-2006
Can I export vars without polluting my namespace?

When I've got a long or hard to type file name, the following is something I like to do for convenience.
Code:
$export a=someReallyLongFileName; touch $a; chown hartmann $a
$ls
.  ..  someReallyLongFileName
$echo $a
someReallyLongFileName

But then, as you see with the echo, I have polluted my environment name space when I don't need it any more. Of course, I could always

Code:
export a=

to unset a, but I'm wondering if there's some conceptually more elegant way to do this. Thanks!

***********************

UPDATE: Figured out at least one way to do this. Use parens.

Code:
$( export a=someReallyLongFileName; touch $a; chown hartmann $a )
$ls *
someReallyLongFileName
$echo $a

$

Please do chime in if there are others.
 

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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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