UBUNTU - Reduce PDF file size with pdf2gs and gs2pdf

First convert pdf to ghostscript:

pdf2ps file1.pdf file2.ps

then reconvert ghostscript to pdf:

ps2pdf file2.ps file3.pdf

file3.pdf is smaller about 50% than file1.pdf bye

UBUNTU - Batch convert SVG files to PDF and join them in a single PDF

I extracted SVG pictures from a site that allow me only to see the files and not to download it with Chrome browser and this extension:

https://chrome.google.com/webstore/detail/export-svg-with-style/dkjdcaddoplepioppogpckelchefhddi?utm_source=chrome-app-launcher-info-dialog

The result is a bunch of SVG files numbered progressively (e.g saved0.svg,saved1.svg....,saved45.svg).
I renamed the first 10 files saved0.svg to saved9.svg to saved00.svg..saved09.svg to avoid problems when merging all pages together. I moved all in a folder and applied this little bash script:



paste it in new file give it execution permission ( chmod 755 filename)
 I dropped the script in the same folder but you can put in /usr/bin to have it always ready ..
The script simply check all files on the folder, verify if they are svg files and attempt comversion to pdf.
The result should be a bunch of pdf files numbered progressively (e.g saved0.pdf,saved1.pdf....,saved45.pdf).


Now with pdftk we can join all single pdf pages lying in the folder in one single file (You need an ordered sequence of files to do it).

pdftk *.pdf cat output FILE.pdf

That's all

BUSYBOX - SSHing to a W-Gate Router

I had to ssh ing to this box running a a stripped version of BusyBox witha really tiny ssh server support with Dropbear that wasn't accepting connection from a regular ssh client on Ubuntu.
After succesfully trying connecting with the dbclient (the dropbear client that acts more or less as a ssh client) , dbclient that is available in ubuntu official software I have noticed that thas box need a specific kind of MAC (Message Authentication Code) algorithm to connect.



Using this option ( -o MACs=hmac-sha1 ) the ssh client connected succesfully letting me make the tunnel that I wanted:


ssh -o MACs=hmac-sha1 -vvvl user ip

UBUNTU - pdftk to join 2 pdf, one wiht odd pages and one with even pages

I have 2 files resulting from my network scanner yet in pdf format.
One file has all even pages with correct order ( Pari.pdf ).
The other has all odd pages but with inverted order (Dispari_invertite.pdf)
The document will start with an even page and then I have to shuffle page one by one from every source file.

This is the (impressive for me) one command solution:




pdftk A=Pari.pdf B=Dispari_invertite.pdf shuffle A Bend-1 output collated.pdf


I assume that you have been entered in the working folder before. The "Bend-1" option reverse the order of B file; so if you need to join 2 ordered odd and even files will use "B" instead. Collated.pdf is the output file of course. For me its an impressive one line command that make me love linux terminal to make things quicker and better than installing a lot of dedicated software. Bye