mimic awk field notation

[Former user]

cut(@,"\t",2) is nice but less than $3 in awk

tab could propose a separator (-s) argument, instead of asking for each cut.

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(and please move from recaptcha, it is so slow to validate)

[Ivan Tkatchev]

Good idea, but should be made more generic.

E.g.: def $ cut(@~0, "\t", @~1) and then $0 is just syntactic sugar for $(@, 0).

($ can be predefined by default.)

[Ivan Tkatchev]

Fix #7

→ <<cset 3ff91ed0a745>>