Shell - file changed

file_changed.sh

MD5_FILE="md5_file"
FILE="somefile"

# create MD5 of somefile
md5=`md5 $FILE | cut -d'=' -f2 | tr -d " "`

# Write md5 to file
md5 > $MD5_FILE

# Get MD5 from file
md5=`cat $MD5_FILE`

#################################################

newmd5=`md5 $FILE | cut -d'=' -f2 | tr -d " "`

if [ -f $MD5_FILE ]; then
    md5=`cat $MD5_FILE`
    
    if [ $newmd5 = $md5 ]; then 
        echo "md5 match, so 'npm install' will NOT be run" 
    else
        echo "$md5 doesn't match $newmd5. Running 'npm install'... "
        newmd5 > $MD5_FILE
        npm run install 
    fi;

else
    echo "$MD5_FILE doesn't exist. Running 'npm install'... "
    newmd5 > $MD5_FILE
    npm run install
fi




###############################################################

OLDMD5File=".package.json.md5"
newmd5=`md5sum package.json | cut -f 1 -d " "`
runnpm=true


if [ -f $OLDMD5File ]; then

	oldmd5=`cat $OLDMD5File`

    if [ $newmd5 = $oldmd5 ]; then 
        echo "\n==== md5's match, so 'npm install' will NOT be run ===="
        runnpm=false
    fi;

fi

if [ "$runnpm" = true ] ; then

	echo "\n==== Disabling progressbar on npm install ===="
	# https://github.com/npm/npm/issues/11283
	npm set progress=false

	echo "\n==== Installing npm packages ===="
	npm install

	echo "\n==== Writing mp5 of package.json to $OLDMD5File ===="
	echo "$newmd5" > $OLDMD5File

fi

#################################################################