问题
I need to check how much time passed since last user input occurence (preffered way - in python) on Linux (lucid - 10.4)
I know that this is easy in normal way (just using XScreenSaverQueryInfo), but the tricky part is that I don't have x11/extensions/scrnsaver.h header and I HAVE to do that some other way (even if I install needed package I cannot install packeges on 100 other computers on which it will work - I don't have permission to do that).
回答1:
In deps of internet I found something like this, and it looks like working - but still not perfect solution because it returns much more info than I need and also the number near which is proper value is not constant (it differs in other system):
ls -l /dev/pts | fgrep username
回答2:
using xprintidle
requirements:
sudo apt-get install xprintidle
usage from command line:
xprintidle
or, in seconds:
echo $((`xprintidle` / 1000))
or from python:
milliseconds_string = os.popen("xprintidle").read()
seconds = int(milliseconds_string)/1000
回答3:
Another solution would to be use the unix command w, this gives the idle time of all users (with the exception of the w command which appears to not reset idle time)
the w command also has a few flags -s and -f to show a short format and not print the hostname giving you slightly less information to find the idle time. I was able to get it down to
> w -sf | grep user
jxw1234 pts/5 6.00s w -sf
This also gives idle time down to seconds so is more precise than ls -l /dev/pts.
From this point it should be pretty simple to run the command using python's system interface and apply a regex to pull out the time in various formats.
EDIT: Using this w command get idle time i was able to get it down to the following result.
>w | awk '{if (NR!=1) {print $1,$5 }}' | grep username
jxw1234 1.00s
来源：https://stackoverflow.com/questions/15068887/user-idle-time-in-linux