Merge multiple jpg into single pdf in Linux

Question

I used the following command to convert and merge all the jpg files in a directory to a single pdf file.

convert *.jpg file.pdf

The files in the directory are numbered from 1.jpg to 123.jpg. The conversion went fine but after converting the pages were all mixed up. I wanted the pdf to have pages from 1.jpg to 123.jpg in the same order as they are named. I tried with the following command as well:

cd 1 FILES=$( find . -type f -name "*jpg" | cut -d/ -f 2) mkdir temp && cd temp for file in $FILES; do BASE=$(echo $file | sed 's/.jpg//g'); convert ../$BASE.jpg $BASE.pdf; done && pdftk *pdf cat output ../1.pdf && cd .. rm -rf temp

But still no luck. Operating platform Linux. Any help will be appreciated!