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bash - enhanced cd

This time, i want to share a small enhancement for the "mkdir" bash command. The code i will paste below is doing the following thing. If you supply a number like 3, this function tries to goes up three directory levels. If you supply a string, it behaves like the normal cd.

function net_bazzline_cd()
  #numeric value given?
  if [ `expr $1 + 1 2> /dev/null` ]; then
    for (( i=1; i <= $1; i++ ))
      cd ..
    cd "$1"

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