How can I change displayed name as sender?
Solution 1:
Don't use mail, there are better command-line MUAs, such as mailx (package bsd-mailx) or mutt.
mailx will do what you want with the -r flag:
echo Test. | mailx -r "Joe Sender <[email protected]>" -s Test [email protected]
You can likewise specify a display name for the recipient, by the way.
The nickname shown in for instance gmail.com comes from the part of the From field that is outside <[email protected]>, so in this example it would be Joe Sender.
Solution 2:
Using mail, you can set the username using the proper syntax, such as echo "Test" | mail -a "From: Someone <[email protected]>" [email protected].