tree won't be installed

[janpieper]

There are some other packages that contain tree in their name, so the function to detect if a package is installed (see below) doesn't work as expected...

Function

package_installed() {
  dpkg --list | grep "\b$1\b" &> /dev/null
}

Changing ^$1$ to \b$1\b doesn't feel better because some of my packages that needs to be installed (e.g. vim) aren't spelled as in the package manager or doesn't exist. Maybe I need to change this.

Example

$ dpkg -l | grep "\btree\b"
ii  libhtml-tree-perl                          5.03-2                                       all          Perl module to represent and create HTML syntax trees
ii  libxml-twig-perl                           1:3.48-1                                     all          Perl module for processing huge XML documents in tree mode
ii  tree                                       1.7.0-3                                      amd64        displays an indented directory tree, in color