Seamaiden,
Many years ago, when I was a young(er) lad, I used Unix extensively (remember X?) I can still read my way through a shell script (well, almost). After a short period of time in the private sector, I succumbed to the dark side of the force, and became a MS-Windows user. I'm afraid that my resistance was futile, and I have been assimilated.
If the tools that I used were available on Linux, I'd seriously consider it. For certain applications, I'd run away from MS-Windows (or relatives) as fast as I could.
I don't know offhand of any Linux-based pixel jpeg resizer, but I'm sure they're out there. I learned about Irfanview from another of my interests, when I posted full size pictures (1.4 MB each) on my personal website, and a kindly expert suggested Irfanview. It works for me.
I agree with the comment that MS Photo Editor, umm, vacuums in a spectacular fashion.
I have Adobe Illustr
ator, CorelDraw suite, and other tools that can resize jpegs (not to mention annotate, blend, etc.). But for a quick resizing, Irfanview is incredibly fast and simple.
Regards,
Hy