Added first draft of script

This script is only the very first initial draft. It still needs some proper kind of input sanitization (no input, or wrong input) together with a respective output.

ghostscript.sh

@@ -0,0 +1,85 @@
+#!/bin/sh
+
+#################################################################
+# This is a script to compress pdf files with ghostscript
+#
+# Author:        Hannes Bohnengel
+# Last modified: 21 September 2016
+# Revision:      0.1
+# CLI usage:     ./ghostscript.sh [FILENAME] [COMPRESSION LEVEL]
+# Sources:       https://gist.github.com/firstdoit/6390547
+#                http://ghostscript.com/doc/current/Ps2pdf.htm
+#
+#################################################################
+
+##
+# -- Settings 
+##
+
+# First input argument (name of input file)
+IN="$1"
+
+# Second input argument (compression level)
+LEVEL="$2"
+
+# Description of compression levels
+#- /screen selects low-resolution output similar to the Acrobat Distiller "Screen Optimized" setting.
+#- /ebook selects medium-resolution output similar to the Acrobat Distiller "eBook" setting.
+#- /printer selects output similar to the Acrobat Distiller "Print Optimized" setting.
+#- /prepress selects output similar to Acrobat Distiller "Prepress Optimized" setting.
+#- /default selects output intended to be useful across a wide variety of uses, possibly at the expense of a larger output file. 
+
+# Setting compression level (5: highest compression; 1: lowest compression)
+case "$LEVEL" in
+1) COMP="/prepress"
+   ;;
+2) COMP="/printer"
+   ;;
+3) COMP="/ebook"
+   ;;
+4) COMP="/screen"
+   ;;
+5) COMP="/default"
+   ;;
+*) COMP="/printer"
+LEVEL=2
+   ;;
+esac
+
+# Create name of output file as INPUTNAME_compressed.pdf
+OUT=${IN%.*}
+OUT="${OUT}-compressed-$LEVEL.pdf"
+
+# Define command
+MYCMD="gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=${COMP} -dNOPAUSE -dQUIET -dBATCH -sOutputFile=${OUT} ${IN}"
+
+##
+# -- End of settings 
+##
+
+# Output
+echo "================================================================================
+ Compression of a pdf file using ghostscript\n
+ Input file name:   $IN
+ Output file name:  $OUT
+ Compression level: $LEVEL/5
+================================================================================\n
+> Starting compression...\n"
+
+# Check second input parameter
+#if [ $2 -lt 1 ] || [ $2 -gt 5 ]
+#then
+#  echo "> Unvalid compression level input -> Set compression level to $LEVEL\n
+#> Starting compression...\n"
+#else
+#  echo "> Starting compression...\n"
+#fi
+
+# Execute command
+$MYCMD
+
+echo "\n> Finished compression"
+
+#################################################################
+# EOF
+#################################################################