Why is my alias from .bashrc not working?
Solution 1:
Your alias has a bad character, not the standard ASCII symbol (minus sign) but another one, which by some fonts is rendered as a longer dash.
This alias works for me
alias untar='sudo tar -xvf'
$ printf '-'|hexdump -C
00000000 2d |-|
00000001
$ printf '–'|hexdump -C
00000000 e2 80 93 |...|
00000003