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摘要：shell为GNU bash 3.2.48我想要求用户输入数字5或者6作为参数，本人参考的是鸟哥的入门课程，里面没有（目前为止）提及条件的结合，所以做过多种错误尝试： 1 # incorrect ones 2 #while ［ -z "$input" || ( ! "$input" == "5" && ! "$input" == "6" ) ] 3 #while ［ -z "$input" || \( ! "$input" == " 阅读全文

摘要：1. Edit or create file ~/.bash_profile.2. To add new alias 'll' in ~/.bash_profile with bellowing line:alias ll="ls -laG | less" 3. To add global variable:export u="/Applications/Utilities/" Save the file and open a new terminal window, those alias and variables are useab 阅读全文