Bash variables: case sensitive or not?
问题 Is bash shell scripting case sensitive? Is variable date the same as DATE ? 回答1: Yes, it is case sensitive, just like the rest of UNIX. $date and $DATE are two different variables. makefile and Makefile are two different files. -h and -H are two distinct flags (usually). 来源: https://stackoverflow.com/questions/15571706/bash-variables-case-sensitive-or-not