shopt nocaseglob

By OK -
$ shopt -s nocaseglob

$ ll a*
-rw-rw-r-- 1 ubuntu2 ubuntu2 0 Aug 12 12:53 a1
-rw-rw-r-- 1 ubuntu2 ubuntu2 0 Aug 12 12:59 A1
-rw-rw-r-- 1 ubuntu2 ubuntu2 0 Aug 12 12:53 a2
-rw-rw-r-- 1 ubuntu2 ubuntu2 0 Aug 12 12:59 A2


$ shopt -u nocaseglob 
ubuntu2@ubuntu2:~/temp/s$ ls a*
a1  a2  a3  a4  a5

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