sh1marin, 2 months ago http://mywiki.wooledge.org/BashFAQ/050#I_only_want_to_pass_options_if_the_runtime_data_needs_them 高级,还有这种用法
http://mywiki.wooledge.org/BashFAQ/050#I_only_want_to_pass_options_if_the_runtime_data_needs_them
高级,还有这种用法