Aliases for mkdir && cd. Quite common usage that is finally improved!

gistfile1.sh

alias mkc "mkdir \!^ && cd \!^"
alias mkt 'cd `~/bin/mktest`'

mktest

#!/usr/bin/ruby
# creates a new directory called "test" + a running counter at the end. if test3 exists, create test4. if no test exists, create test1.
test_dir = (`ls -tr | grep test | tail -1` =~ /^test(.*)$/  \
            && "test" + ($1.to_i+1).to_s        \
            || "test1")

`mkdir #{test_dir}`
puts test_dir