allow providing command as parameter — e.g.: up grep

[pannous]

please allow giving command to up as parameter (also to avoid the rm nightmare)

[Mateusz Czapliński]

Thanks for the idea! I'd like to actually do this indeed at some point in future.

[Brian McKenna]

This would work for my ghci stuff.

[Mateusz Czapliński]

Note to self: because we now support various different shells (which have different standards for quoting), the full pipeline would have to be passed as a single argument (in quotes). For symmetry with a convention that seems popular among Linux tools, I think it would be a good idea then to pass it via a "-c" flag. Example call would then look like below:

$ lshw |& up -c "grep network -A2 | grep :"

edit: This flag could also be used to load commands from old upN.sh scripts, e.g. in bash:

$ lshw |& up -c "$( tail -n1 up1.sh )"

This could possibly be shortened to:

$ lshw |& up --command-from up1.sh

(+ internally: assert( len(lines) == 1 || (len(lines)==2 && lines[0].startsWith("#")) ) )

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@puffnfresh Does the $SHELL discovery feature added in v0.3 work for you for ghci?