Single command to list the software packages (RPMs) by install date in Linux Server

Occasionally one needs to get a list of all software packages (rpm's) installed on a RHEL host, sorted by their install date. While there are many ways to do this

# rpm -qa --last

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or

 copy and paste the following scriptlet into a shell command line:

#rpm -qa --queryformat="%{INSTALLTIME} %{NAME}\n" | sort -n | while read rpm_line; do rpm_date=$( date -d @$(echo $rpm_line | awk '{print $1}')); rpm=$( echo $rpm_line | awk '{print $2}'); printf '%-50s %s\n' "$rpm" "$rpm_date"; done

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Hope it helps