this post was submitted on 27 Dec 2025
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Linux

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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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Put screen time in your bash prompt (mander.xyz)
submitted 1 day ago by podbrushkin@mander.xyz to c/linux@lemmy.ml
31 comments fedilink hide all child comments
 

Paste this into Bash:

get_screen_time() {
since=${1:-today}
until_opt=${2:+--until "$2"}

journalctl --output json -u systemd-logind --since "$since" $until_opt | \
jq -r 'select(.MESSAGE_ID and .__REALTIME_TIMESTAMP) |
if (.MESSAGE | test("Lid opened|Starting systemd-logind|Operation .suspend. finished")) then
  .__REALTIME_TIMESTAMP + " start"
elif (.MESSAGE | test("Lid closed|Stopping systemd-logind|system will suspend")) then
  .__REALTIME_TIMESTAMP + " stop"
else
  empty
end' | \
awk -v current_time=$(date +%s%6N) '
{
    if ($2 == "start") {
        last_start = $1
    } else if ($2 == "stop" && last_start != 0) {
        total += ($1 - last_start) / 1000000
        last_start = 0
    }
}
END {
    if (last_start != 0) {
        total += (current_time - last_start) / 1000000
    }
    seconds = int(total)
    hours = int(seconds/3600)
    minutes = int((seconds%3600)/60)
    printf "%02d:%02d", hours, minutes
}'
}
PS1='$(get_screen_time) '$PS1

Now you have screen time for today in your prompt:

00:21 user@asus:~/Documents$ 
00:21 user@asus:~/Documents$ cd ../Pictures/
00:21 user@asus:~/Pictures$

Cool?

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