Convert PDF page to image using image magick

convert_magic.sh

# create magick shell command to convert the first page of PDF file into image format
# Usage: convert_magic.sh <PDF file> <image format> <output name>
# convert_magic.sh input.pdf png output.png

# check if the PDF file exists
if [ ! -f $1 ]; then
    echo "File $1 does not exist"
    exit 1
fi

# check if the image format is specified
if [ -z $2 ]; then
    echo "Image format is not specified"
    exit 1
fi

# check if the image format is supported
if [ $2 != "png" ] && [ $2 != "jpg" ] && [ $2 != "gif" ]; then
    echo "Image format $2 is not supported"
    exit 1
fi

# check if desired output not specified
if [ -z $3 ]; then
    echo "Output name not specified"
    exit 1
fi

# convert the first page of PDF file into image format
magick convert -density 300 -quality 100 $1\[0\] $2:$3