Bash script to unzip files in directory

This link for a script to unzip all files within a directory works flawlessly in bash with only the use of zip and sed

In case link ever fails I am copying code here as safeguard

#!/bin/sh
for zip in *.zip
do
  dirname=`echo $zip | sed 's/\.zip$//'`
  if mkdir "$dirname"
  then
    if cd "$dirname"
    then
      unzip ../"$zip"
      cd ..
      # rm -f $zip # Uncomment to delete the original zip file
    else
      echo "Could not unpack $zip - cd failed"
    fi
  else
    echo "Could not unpack $zip - mkdir failed"
  fi
done