Create iso image from folder via terminal commands

Seems to be pretty straightforward to do with genisoimage, in the package with the same name on Debian:

genisoimage -o output_image.iso directory_name

There are many options to cover different cases, so you should check the man page to see what fits your particular use case.

See also

Making a CD from a folder can be performed with mkisofs.

mkisofs -lJR -o output_image.iso directory_name

-l : Allow full 31 character filenames.

-J : Generate Joliet directory records in addition to regular iso9660 file names.

-R : Generate System Use Sharing Protocol (SUSP) and Rock Ridge (RR) records using the Rock Ridge protocol

https://linux.die.net/man/8/mkisofs https://en.wikipedia.org/wiki/Rock_Ridge

Take this basic command of:

  mkisofs -o output_image.iso directory_name

One step further, by adding a volume label to the iso, and compressing the iso-image with gzip

  mkisofs -V volume_label -r folder_location | gzip > output-image-comressed.iso.gz

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