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using this command I save all the sudo apt-get install to a text file: history | grep "sudo apt-get install" | sed 's/^ *//' | cut -d' ' -f3- > ~files/packages/installed_on_raspberrypi.txt

how can I make a cron job that it should run twice a day in morning and in the end of the day ?

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Use of etckeeper is a very good idea.

However, to get a list of all installed (and deinstalled) packages, you should use: dpkg --get-selections. This gives you all packages that should be installed and uninstalled on your system.

If you ever want to reinstall a system according to this list you do: dpkg --set-selections < /path/to/file and then run apt-get dselect-upgrade

If you want to see what was when installed and/or uninstalled you have the logfile: /var/log/dpkg.log

Using the history command might not reveal everything that you have installed, since it does not save a great bunch of commands, except of course you set it longer. man history gives you more information on that.

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While not a text file nor using chron, you can use a combination of git and etckeeper to achieve the same result.

etckeeper allows the contents of /etc to be stored in a Version Control System (VCS) repository. It integrates with APT and automatically commits changes to /etc when packages are installed or upgraded. Placing /etc under version control is considered an industry best practice, and the goal of etckeeper is to make this process as painless as possible. - from the Ubuntu Documentation

Start by installing git:

sudo apt-get install git

Configure git for the root account:

sudo git config –global user.name “Your Name”
sudo git config –global user.email youremailaddress

Then install etckeeper:

sudo apt-get install etckeeper

Because git is already installed this will not only install etckeeper, but initialize the database and make an initial commit of the files in /etc.

You can check the status of the repository with the following commands:

cd /etc
sudo git status

you should see the following:

On branch master nothing to commit, working directory clean

Now anytime you run an apt command (install, purge etc.) Etckeeper will automatically add a commit to the underlying git repo, noting the changes and time they were made.

You can view all packages installed, updated and removed using the git log command.

cd /etc
sudo git log

As I mentioned this is not a text file, but the git log can certainly be turned into a text file if needed. This also has the advantage of being automatic and tracking any changes made manually to your systems config files.

I wrote a blog post with additional details and some config settings you may want to make available here.

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