install

pnpm version: >=6.11.0-0

Code to reproduce the issue:

Describe the bug
Please, add "overwrite" files in the destination option. Instead of adding *.duplicate1 files, I'd like lessmsi to overwrite files in the destination.

To Reproduce
Steps to reproduce the behavior:

1. Use lessmsi to extract some msi
2. Use lessmsi to extract the same msi
3. Observe *.duplicate1 files, and no option to overwrite instead

Expected behavior

Attempting to use "sudo deb-get install firefox-esr", the PPA's repo is added but the package is never installed.

I think the logic in install_ppa() is broken:

if ! dpkg -l "${APP}" >/dev/null 2>&1; then
     eula
     apt-get -q -y install "${APP}"

Here "dpkg -l" will return non-zero if a package is missing, but the if statement is checking for zero.

Even if this worke