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在bash脚本中,我们可以通过:
 shopt -s extglob
 为后续代码提供通配功能。
 但如果在block中设置,将不会生效。如:
if true; thenshopt -s extglob...
fi
 
这是因为:
 you cannot put shopt -s extglob inside a statement block that uses extended globs, because the block as a whole must be parsed when it’s defined; the shopt command won’t take effect until the block is evaluated, at which point it’s too late.
