post(pdf-compress): rename original file

source/_posts/make-pdf-files-smaller.md

@@ -53,10 +53,14 @@ Use the following script to compress all PDFs in a folder.
 
 Usage: `sh pdfcompress.sh 'target folder'`
 
+*If `'target folder'` is not specified, defaults to current directory.*
+
 ```bash
 #!/bin/sh
 
-cd "$1"
+if [ -n "$1" ]; then
+  cd "$1"
+fi
 
 for i in *.pdf; do
     [ -f "$i" ] || break
@@ -64,8 +68,7 @@ for i in *.pdf; do
   # Skip compressed PDFs
   echo "$i" | grep --quiet ".compressed.pdf"
 
-  if [ $? = 1 ]
-  then
+  if [ $? = 1 ]; then
     gs \
       -sOutputFile="${i%.*}.compressed.pdf" \
       -sDEVICE=pdfwrite \
@@ -80,5 +83,36 @@ for i in *.pdf; do
 done
 ```
 
+If you prefer to use the original filename as the compressed version and rename the original uncompressed's to "*.original.pdf",
+
+*Following script doesn't skip previously compressed PDFs*
+
+```bash
+#!/bin/sh
+
+if [ -n "$1" ]; then
+  cd "$1"
+fi
+
+for i in *.pdf; do
+  [ -f "$i" ] || break
+
+  # Rename original file to *.original.pdf
+  original="${i%.*}.original.pdf"
+  mv "$i" "$original"
+
+  gs \
+    -sOutputFile="$i" \
+    -sDEVICE=pdfwrite \
+    -dPDFSETTINGS=/ebook \
+    -sColorConversionStrategy=Gray \
+    -sColorConversionStrategyForImages=/Gray \
+    -dProcessColorModel=/DeviceGray \
+    -dCompatibilityLevel=1.4 \
+    -dNOPAUSE -dBATCH -dQUIET \
+    "$original"
+done
+```
+
 <br/><br/>
 Source: [Internal Pointers](https://www.internalpointers.com/post/compress-pdf-file-ghostscript-linux), [firstdoit](https://gist.github.com/firstdoit/6390547), [ahmed-musallam](https://gist.github.com/ahmed-musallam/27de7d7c5ac68ecbd1ed65b6b48416f9), [Ghostscript Docs](https://ghostscript.com/doc/current/Ps2pdf.htm)