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Surround the first letter of what you are grepping with square brackets and you won't have to spawn a second instance of grep -v. You could also use an alias like this (albeit with sed):
alias psgrep='ps aux | grep $(echo $1 | sed "s/^\(.\)/[\1]/g")'
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ps itself is replaced with a new command pgrep. man pgrep for more goodies.
If you can do better, submit your command here.
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