Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?
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task=${PWD##*/}
Next, you can simplify the one-condition if clause:[ -f $task.c ] && vi ...
Then you can combine all the vi commands with | (bar)set mouse=n|set autoread|vsplit ...
Personally, I'd put the mouse=n and autoread in my ~/.vimrc Then, to save a little typing we can abbreviate: "task" to "t", "set" to "se", "autoread" to "ar", "vsplit" to "vs", "split" to "sp" and "wincmd" to "winc". That leaves:alias viaco='t=${PWD##*/}; [ -f $t.c ] && vi -c "vs $t.out|sp $t.in|winc l|winc H" $t.c'
A reduction from 188 to 88 characters (it's possibly a bit cryptic, now :-) Note: I've removed the quotes from around the filenames. If there's any whitespace in the filenames then your original command will fail when vi tries to open files.