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# who -u
root tty12 2017-02-23 18:21 00:07 7281
pepe tty4 2017-02-23 19:22 00:09 7649
root tty3 2017-02-23 17:52 00:10 6929
root tty2 2017-02-23 16:54 00:10 6570
root tty1 2017-02-23 16:50 00:09 6529
angel pts/0 2017-02-23 19:32 . 7742
# who -u|grep pepe|awk {'print $4'}
19:22
BEGIN \{ # Initialize table of month lengths
_tm_months[0,1] = _tm_months[1,1] = 31
_tm_months[0,2] = 28; _tm_months[1,2] = 29
_tm_months[0,3] = _tm_months[1,3] = 31
_tm_months[0,4] = _tm_months[1,4] = 30
_tm_months[0,5] = _tm_months[1,5] = 31
_tm_months[0,6] = _tm_months[1,6] = 30
_tm_months[0,7] = _tm_months[1,7] = 31
_tm_months[0,8] = _tm_months[1,8] = 31
_tm_months[0,9] = _tm_months[1,9] = 30
_tm_months[0,10] = _tm_months[1,10] = 31
_tm_months[0,11] = _tm_months[1,11] = 30
_tm_months[0,12] = _tm_months[1,12] = 31
}# decide if a year is a leap year
function _tm_isleap(year, ret)
{ret = (year % 4 == 0 && year % 100 != 0) ||
(year % 400 == 0)
return ret
}# convert a date into seconds
function _tm_addup(a, total, yearsecs, daysecs,
hoursecs, i, j)
{hoursecs = 60 * 60
daysecs = 24 * hoursecs
yearsecs = 365 * daysecs
total = (a[1] - 1970) * yearsecs
# extra day for leap years
for (i = 1970; i < a[1]; i++)
if (_tm_isleap(i))
total += daysecs
j = _tm_isleap(a[1])
for (i = 1; i < a[2]; i++)
total += _tm_months[j, i] * daysecs
total += (a[3] - 1) * daysecs
total += a[4] * hoursecs
total += a[5] * 60
total += a[6]
return total
}# Function mktime convert a date into seconds
function mktime(str, res1, res2, a, b, i, j, t, diff)
{i = split(str, a, " ") # don't rely on FS
if (i != 6)
return -1 # force numeric
for (j in a)
a[j] += 0
# validate
if (a[1] < 1970 ||
a[2] < 1 || a[2] > 12 ||
a[3] < 1 || a[3] > 31 ||
a[4] < 0 || a[4] > 23 ||
a[5] < 0 || a[5] > 59 ||
a[6] < 0 || a[6] > 61 )
return -1res1 = _tm_addup(a)
return res1
}{last_t=substr($2 " " $3,1,19)
getline < "check_time.txt"
curr_t=$0 # Convert last_time to seconds (epoch)
b=last_tgsub(/[-:]/," ",b)
last_s=mktime(b)
# Convert curr_time to seconds (epoch)
b=curr_tgsub(/[-:]/," ",b)
curr_s=mktime(b)
print ((curr_s-last_s)<=3600) ? 0 : 1
}who -u| awk '{print $1, $3 " " $4 ":00"}' > user_conn.txt
count=$(cat user_conn.txt | awk -f check_time.awk )
if [ $count -eq 1 ]; then
# mas de 60 minutos conectado
echo "$(awk '{print $1}' user_conn.txt) Tiene mas de una hora conectado, favor de revisar. $(date)" | mail -s "$SUBJECT" $EMAILID
fi