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The cron command-line utility is a job scheduler on Unix-like operating systems.Users who set up and maintain software environments use cron to schedule jobs [1] (commands or shell scripts), also known as cron jobs, [2] [3] to run periodically at fixed times, dates, or intervals. [4]
VisualCron is a replacement for the Windows Task Scheduler and a similar cron job scheduler in Unix-like operating systems. [1] The software is split into client and server parts, with the former being invoked by the user on demand and the latter always running as a process in the background. [1]
It can compress the archives and send a signal to a process to reset logging. The command is often run as a cron job, which has the effect of fully automatic log rotation. Typically, a new logfile is created periodically, and the old logfile is renamed by appending a "1" to the name.
A job scheduler is a computer application for controlling unattended background program execution of jobs. [1] This is commonly called batch scheduling, as execution of non-interactive jobs is often called batch processing, though traditional job and batch are distinguished and contrasted; see that page for details.
It aims to replace Vixie-cron and Anacron with a single integrated program, providing many features missing from the original Cron daemon. [3] Some of the supported options permit: [3] run jobs one by one; set the max system load average value under which the job should be run; set a nice value for a job
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In addition to the graphical user interface for Windows Task Scheduler in Control Panel, Windows provides an at.exe command that schedules commands and programs to run on a computer at a specified time and date (similar to cron). It is available since Windows NT, but is now deprecated in favor of schtasks.
Stage 1 involves a worm which adds code to the device's crontab (the list of tasks run at regular intervals by the cron scheduler on Linux). This allows it to remain on the device after a reboot, and to re-infect it with the subsequent stages if they are removed. Stage 1 uses known URLs to find and install Stage 2 malware.