bash script to npm i --save-exact an npm package/module in every repo in a directory

update_package.sh

#!/bin/bash

if [ $# -lt 2 ]; then
    echo "Usage: update_package <directory> <package> [optional: <version>]"
    exit 1
fi

if [ "$3" ]; then
    version=$3
else
    version="latest"
fi

echo "looking for: /^\s+\"${2}\":/ in package.json"

for arg in $( ls $1 | egrep '^dsm-' ); do
    (
        cd "$arg"
        if egrep -q "\"${2}\":" package.json; then 
            echo "$arg has $2"
            echo "running: npm i $2@$version --save-exact"
            npm i "$2@$version" --save-exact
        fi
    )
done;