Re: have zsh invoke a command/script but not exit

["Tim K. (Gmane)" <tk-gmane+at@idpax.com>]

Thanks for your reply. I have to go learn about the advanced (at least 
to me) things you suggested below.

Tim



Bart Schaefer wrote:

>On May 30,  8:51am, Tim K. (Gmane) wrote:
>}
>} Is it possible to start zsh and invoke some other command/script but 
>} upon command completion to return to interactive mode rather than exit 
>} from zsh?
>
>After the startup files are finished, zsh reads commands from exactly
>one of four places:  The argument of the -c option, the current terminal,
>the standard input, or a script file.
>
>A script file is assumed if zsh has arguments but no options specifying
>one of the other sources.  The documentation implies that -s forces zsh
>to read from stdin, but in fact the -s option only determines whether
>any further arguments are taken as the name of a script file; when both
>-i and -s appear, -i takes precedence to force input from the terminal.
>The -c option overrides both -i and -s, except that the .zshrc file is
>read when both -i and -c appear.
>
>The prompt is printed only in interactive mode, and you can't change the
>value of that option after startup, so it's impossible to be prompted
>after a command has been read from anywhere other than the terminal
>(unless you run your own input loop e.g. using "vared").
>
>} The only way I can think off is to put some hack in my .zshrc where if 
>} some env variable is set it will run that command at the end of my 
>} .zshrc file
>
>How about using $@ instead of an environment variable?
>
>    if [[ $1 == eval ]]
>    then
>    	"$@"
>	set --
>    fi
>
>Then you run this as
>
>    zsh -is eval 'ls *.txt'
>
>You could even skip the requirement that "eval" be the first word:
>
>    if (( $# ))
>    then
>    	eval "$@"
>	set --
>    fi
>
>However, using "eval" as a keyword there means that you can still use
>zsh -is with other argument strings without treating them as commands.
>
>I like this because it lends itself to becoming an alias.
>
>    alias zshi='zsh -is eval '
>
>(The trailing space is for completion purposes.)
>
>Hmm.  Depending on how you expect to use that, you might want to change
>the .zshrc part to:
>
>    if [[ $1 == eval ]]
>    then
>    	"${(q)@}"
>	set --
>    fi
>
>You can see the difference if you run:
>
>    zshi echo foo \; echo bar
>    zshi 'echo foo ; echo bar'
>
>Try each of those both with the (q) and without, and pick the way that
>makes the most sense to you.
>
>  
>