josh@phoenix:$ for file in *.jpg
> do
> convert -resize 200 "$file" sm_"$file"
> done
josh@phoenix:$

[or putting that all together:]

for file in *.jpg; do convert -resize 210 "$file" sm_"$file"; done

for file in *.TIF; do mogrify -resize 200 -format jpg "$file";rename 's/IMG/kohandatud_tekst/' *.jpg; done

rename 's/sm_IMG/kohandatud_tekst/' *.jpg

for file in *.TIF; do convert -resize 1200x1200 "$file" /media/test/pisipildid/"${file/TIF/jpg}"; done