# pdfScale.sh
Bash Script to scale PDFs from the command line.  
Uses ghostscript to create a scaled version of the pdf input.  
The "paper" size does not change, just the elements are resized.   

## Dependencies  
The script uses `basename`, `cat`, `grep`, `bc`, `head` and `gs` (ghostscript).   
You probably have everything installed already, except for ghostscript.   

##### apt-get
```
sudo apt-get install ghostscript bc
```
##### yum
```
sudo yum install ghostscript bc
```
##### homebrew MacOS
```
brew install ghostscript
```
##### ImageMagick
As of version 1.2.7 ImageMagick was reintroduced as an optional way to get the first page size.   
You will need to install imagemagick and have `identify` available on your `$PATH` to then use the `-i` parameter.   


## Help info
```
$ pdfscale -h
pdfscale v1.3.1

Usage: pdfscale [-v] [-s <factor>] [-i] <inFile.pdf> [outfile.pdf]
       pdfscale -h
       pdfscale -V

Parameters:
 -v          Verbose mode, prints extra information
             Use twice for even more information
 -h          Print this help to screen and exits
 -V          Prints version to screen and exits
 -i          Use imagemagick to get page size, 
             instead of postscript method
 -c          Use cat + grep to get page size, 
             instead of postscript method
 -s <factor> Changes the scaling factor, defaults to 0.95
             MUST be a number bigger than zero. 
             Eg. -s 0.8 for 80% of the original size 

Notes:
 - Options must be passed before the file names to be parsed
 - The output filename is optional. If no file name is passed
   the output file will have the same name/destination of the
   input file, with .SCALED.pdf at the end (instead of just .pdf)
 - Having the extension .pdf on the output file name is optional,
   it will be added if not present
 - Should handle file names with spaces without problems
 - The scaling is centered and using a scale bigger than 1 may
   result on cropping parts of the pdf.

Examples:
 pdfscale myPdfFile.pdf
 pdfscale myPdfFile.pdf myScaledPdf
 pdfscale -v -v myPdfFile.pdf
 pdfscale -s 0.85 myPdfFile.pdf myScaledPdf.pdf
 pdfscale -i -s 0.80 -v myPdfFile.pdf
 pdfscale -v -v -s 0.7 myPdfFile.pdf
 pdfscale -h
```

## Example run
```
$ pdfscale -i -v -s 0.5 ../input.pdf 
pdfscale v1.2.10 - Verbose execution
Checking for ghostscript and bcmath
Checking for imagemagick's identify
  Scale factor: 0.5
    Input file: ../input.pdf
   Output file: ../input.SCALED.pdf
         Width: 595 postscript-points
        Height: 842 postscript-points
 Translation X: 297.500000
 Translation Y: 421.000000
```

## System Install
Please note that the system installer will name the executable as `pdfscale` with no uppercase chars and without the `.sh` extension.  
  
If you have `make` installed you can use it to install to `usr/local/bin/pdfscale` with:  
```
sudo make install
```  
  
To remove the installation use:  
```
sudo make uninstall
```