Re: alias to the sub shell

On 2006-04-08, Dan Mercer wrote:

"dondora" <koninja@xxxxxxxxxxx> wrote in message news:1144311415.520033.223430@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
: thanks Chris.
: the shell I'm using is korn shell
: the procedure i did is
:
: $ alias -x dir='ls -al'
: $ ksh (goes into the subshell)

This is not a subshell, it's a brand new shell. Subshells
are created explicitly by the use of parentheses or by
command substitution. They are also created in pipelines
or by calling scripts without a shebang.

A script without a shebang is a new process, not a subshell.

FWIW, the use of aliases in scripts for anything other than
abbreviating a long path (and then should be aliased in the script)
is not a Best Practice. Aliases are useful interactively and
probably should be restricted to interactive use.

The bash man page says it best:

For almost every purpose, aliases are superseded by shell
functions.

--
Chris F.A. Johnson, author | <http://cfaj.freeshell.org>
Shell Scripting Recipes: | My code in this post, if any,
A Problem-Solution Approach | is released under the
2005, Apress | GNU General Public Licence
.

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