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Corona688, first want to run this script at a certain time at the exact millisecond and get the results I asked in the first post if cron or if there is any alternative, I get the results can be...

Dear Corona, I need to parse some text files and send the results in more precise or approximate time, 1 second after the data no longer serve because they change constantly.

Ok I understand what you're explaining to me, but in practice I have to compile with gcc and run this source to ejectue anticipates the execution of the script before and at the time more precisely...

There I have one job in /etc/crontab

00 12 * * * root /script.sh

in script.sh

#!/bin/bash
DATE=`date +%d_%m_%Y_%_A_%T_%N`
DIR=/
echo "$DATE" > $DIR/exec

Result file exec
...

Hello, I have several cron jobs scheduled but looking at the results of running I see in some cases it takes more than 2 seconds, is there any way to adjust the accuracy of execution of cron?
Is...