Is there an app/command that allows me to view recent notifications?
I would also like to view the notification timeout for each notification. ;)
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There isn't any command for retrieving previously send messages in Desktop Notifications Specification so my guess is that they are discarded after retrieving.
You can however observe these using
dbus-monitor command, like this:
$ dbus-monitor "interface='org.freedesktop.Notifications'"
Sending simple notification:
$ notify-send "Hi there!"
results with following information:
method call time=1555095758.597788 sender=:1.385 -> destination=:1.386 serial=6 path=/org/freedesktop/Notifications; interface=org.freedesktop.Notifications; member=GetServerInformation method call time=1555095758.601101 sender=:1.385 -> destination=:1.386 serial=7 path=/org/freedesktop/Notifications; interface=org.freedesktop.Notifications; member=Notify string "notify-send" uint32 0 string "" string "Hi there!" string "" array [ ] array [ dict entry( string "urgency" variant byte 1 ) ] int32 -1 signal time=1555095765.734845 sender=:1.386 -> destination=:1.385 serial=15 path=/org/freedesktop/Notifications; interface=org.freedesktop.Notifications; member=NotificationClosed uint32 1 uint32 1
Time field is an UNIX timestamp, can be translated like this:
$ date -d @1555095765 Fri Apr 12 21:02:45 CEST 2019
I've been using this for over a year on UbuntuMate 16/18