On Mon, Feb 20, 2017 at 10:46:23AM +0000, Andy Blanchard wrote:
> On 20 February 2017 at 09:18, T_POL <t_...@tiscali.it> wrote:
> >
> > not sure about that but I think the "cd" command executes indeed
> > but it's valid only for the scripts' environment and not for the
> > shell you started the script from.
>
> *ding* *ding* *ding* We have a winner!
>
> Shells execute in their own instance of bash (or whatever) - a
> subshell. The way to do this is with an alias or function, depending
> on your needs (aliases don't except parameters, functions do), so
> here's the function for "mdcd":
>
> $ mdcd() {
> # additional checks here, per original post
> mkdir $1
> cd $1
> }
>
>
> Alternatively, you can force a script to run in the current shell by sourcing
> it
>
> $ . {scriptname}
>
> Note the "." between the prompt and script (you can also use the more
> literal "source"):
>
> $ source {scriptname}
>
> Another option, just for completeness, would be to alias sourcing a
> script, e.g.:
>
> $ alias mdcd='. {path to script}'
>
A caveat I think the OP already found out. Both the sourced
script and the function would be running in the users
interactive shell environment, it must for the cd to be effective.
Thus you do not want to "exit" from either the sourced
script nor from the function as that causes the interactive
shell to exit. In the function you can use "return <status>"
instead of "exit <status>".
Jon
--
Jon H. LaBadie jo...@jgcomp.com
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