punzip

#! /usr/bin/env bash

usage() {
cat <<EOF
--requires GNU parallel--

This script will parallelize unzipping .gz files from a given directory into
another directory, while keeping the original archives intact. You may 
optionally provide a search phrase to unzip only specific files. If the input
directory specified doesn't exist, one will be created. As a note, the directory
must end in a / (ex. ~/bonjovi/).

        [Usage]
punzip <infiles.directory> <output.directory> <optional.search.phrase>

      --Examples--
punzip ~/data/raw/ ~/data/processed/ 
punzip ~/data/raw/ ~/data/processed/ flounder

EOF
}

if [[ -z "$1" ]]; then
  usage
  exit 1
fi

echo "now unzipping into" $2 
echo "if >2 compressed files and are >15gb, you may notice harmless system lag"

WORKDIR=$1
OUTDIR=$2

if [[ -z "$3" ]]; then
KEYWORD="*.gz"
else
KEYWORD=*"$3"*
fi

mkdir -p $OUTDIR

find $WORKDIR -name "$KEYWORD" | parallel gunzip -c {} '>' $OUTDIR{/.}