Case insensitive sorting

Question

Vim's default sort is case sensitive, and produces results like this:

A
B
a

How can it be made case-insensitive, to produce the following result given the same input?

A
a
B

Solution

Vim's own :sort command

:%sort i

does what you want.

See :help :sort.

Alternatively, you can also use your system's sort command as a filter:

:%!sort -f

See :help filter in Vim and $ man sort in your shell.

Comments

[Hastur]

what about to use sort -f eventually redirecting output to a new file sort -f old_file > new_file?

[FDinoff]

I assume you mean case sensitive in the first one?

[Deqing]

What's different between :%sort i and :sort i?

[romainl]

No fundamental difference. The former is explicit about the range on which it operates on while the latter is implicit.