How to Send an Email With Attachment From the Command Line
The easiest way is using mutt:
mutt -s "Subject" -a /path/to/file -- name@domain.tld < /dev/null
Multiple attachments are possible as well:
mutt -s "Subject" -a /path/to/file -a /path/to/file -a /path/to/file -- name@domain.tld < /dev/null
Update
Reader Patrick Hemmen reported an alternative approach using mpack, a
small MIME encode/decoder.
mpack -s "Subject" /path/to/file name@domain.tld
The software was last updated in 2003 though and may contain unfixed issues. It can also send only one attachment at a time. Still, it’s good to know about different ways of achieving the same goal.