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head -2 <filename> | sed 's/\//\\/g'

Can I create a file called '-a' in unix.Or can i open it with vi ?

vi \-a will give u an error that -a is invalid option for vi.

I am using bash shell from quite a long.But i could not understand how the shell is working for the below example.The shell i am using is bash.

a=5
a=2 echo $a (no semicolon after assignment)...