Splitting a string to tokens according to shell parameter rules without eval

问题

I have a string like

$ str="abc 'e f g' hij"

and i wish to get whole e f g part of it. In other words, i wish to tokenize the string according to shell parameter rules.

Currently, i am doing that as

$ str="abc 'e f g' hij"; (eval "set -- $str"; echo $2)

but this is totally unsafe if a single * gets outside of '-ticks.

Any better solutions?

回答1:

You can use set -f to disable filename expansion altogether.

$ str="* 'e f g' hij"
$ ( set -f; eval "set -- $str"; echo $2 )
e f g

This addresses just one problem you might anticipate with eval, but there may be other options available with set you can explore.

来源：https://stackoverflow.com/questions/14913678/splitting-a-string-to-tokens-according-to-shell-parameter-rules-without-eval