A free and open source command-line scheduler with an almost-natural language interpreter, delivering remote management and an intuitive programming interface for multiple programming languages.
uSched services provide an interface to schedule commands to be executed at a particular time, optionally repeating them over a specified interval, and optionally stopping them at any other particular time.
It provides a simple and intuitive natural language that is intepreted via a command line client, but can also be integrated into any programming language through its client libraries and bindings.
It also operates as a client/server, where requests performed by clients can affect local or remote machines where uSched services are running.
uSched is designed to be compliant with any POSIX-oriented operating system. It was successfully tested under Linux, FreeBSD, OpenBSD, SunOS, Minix, Darwin and others, and multiple architectures (x86/64, ARM, MIPS, SPARC and more).
There are some features that may not be enabled by default in the case of some non-portable calls being unavailable on the target operating system, such as chroot(). To disable such calls and features, set the CONFIG_POSIX_STRICT definition to 1 in the include/config.h file.
uSched client will compile on most Windows versions and the API bindings are available for C#.
Perform the following commands:
~# cd /usr/src
~# mkdir usched
~# wget https://github.com/ucodev/usched/archive/v0.1.tar.gz
~# tar zxvf usched-v0.1.tar.gz -C usched
~# cd usched
~# ./deploy
or see INSTALL.txt
Run the do_backups.sh script at 23:00 and then run it every 24 hours:
~$ usc run '/usr/local/bin/do_backups.sh' on hour 23 then every 24 hours
Dump 'df -h' output into /tmp/disk_stats.log after 10 minutes of running this command, and run it again every 30 minutes:
~$ usc run '/bin/df -h >> /tmp/disk_stats.log' in 10 minutes then every 30 minutes
Run the command 'sync' now, repeat every 45 seconds and stop when the time is 12:00:
~$ usc run '/bin/sync' now then every 45 seconds until to time '12:00:00'
Send a some sort of notification in 30 minutes:
~$ usc run '/usr/local/bin/notify.sh something' in 30 minutes
Capture network traffic on interface eth0 between 8:00 and 18:00, every day:
~# usc run 'tcpdump -i eth0 -w /tmp/traffic_`date +%Y%m%d`.dump' on hour 8 every 1 day
~# usc run 'killall tcpdump' on hour 18 every 1 day
Perform a request on a remote machine running uSched:
~$ usc -H remote.example.com -U username run '/usr/local/bin/do_something.sh' on time 11:00:00
Password:
~$
Show all scheduled entries for the user by running the following command:
~$ usc show all
Stop all scheduled entries for the user by running the following command:
~$ usc stop all
Useful documentation links:
- GitHub uSched Wiki - The official uSched project wiki
- uSched FAQ - Frequently Asked Questions
- Getting Started - A starters guide to uSched
- Getting Help - How to get help installing, configuring and using the project
Reference Manual:
Overview manual page:
usched(7)
Command-line manual pages:
usched(1), usa(1), usc(1), usd(1), use(1), usm(1)
Programmer's manual pages:
usched_destroy(3), usched_init(3),
usched_opt_set_remote_hostname(3), usched_opt_set_remote_port(3)
usched_opt_set_remote_username(3), usched_opt_set_remote_password(3),
usched_request(3),
usched_result_free_run(3),
usched_result_free_show(3),
usched_result_free_stop(3),
usched_result_get_run(3),
usched_result_get_show(3),
usched_result_get_stop(3),
usched_usage_error(3), usched_usage_error_str(3)
Generate Doxygen HTML files (into doc/doxygen/doxyfiles/):
~$ make doxygen
Brief installation guide:
See example/ directory for library usage examples in C, C#, Java, PHP, Python and more yet to come. The following sections illustrate some code snippets for some of the supported programming languages.
#include <usched/lib.h>
int main(void) {
usched_init();
/* Optional remote parameters. Not required for localhost requests */
usched_opt_set_remote_hostname("remote.usched.example.com");
usched_opt_set_remote_port("7600");
usched_opt_set_remote_username("username");
usched_opt_set_remote_password("password");
/* Perform the request */
usched_request("run \'df -h >> /tmp/disk.txt\' now then every 30 seconds");
usched_result_free_run();
usched_destroy();
return 0;
}
using UschedAPI;
namespace UschedExample {
class Program {
public static void Main(string[] args) {
Usched usc = new Usched();
/* Optional remote parameters. Not required for localhost requests */
usc.SetHostname("remote.usched.example.com");
usc.SetPort("7600");
usc.SetUsername("username");
usc.SetPassword("password");
/* Perform the request */
usc.Request("run 'df -h >> /tmp/disk.txt' now then every 30 seconds");
}
}
}
class UschedExample {
public static void main(String[] args) {
Usched usc = new Usched();
/* Optional remote parameters. Not required for localhost requests */
usc.SetHostname("remote.usched.example.com");
usc.SetPort("7600");
usc.SetUsername("username");
usc.SetPassword("password");
/* Perform the request */
usc.Request("run 'df -h >> /tmp/disk.txt' now then every 30 seconds");
}
}
include("usched.php");
$usc = new Usched();
/* Optional remote parameters. Not required for localhost requests */
$usc->SetHostname("remote.usched.example.com");
$usc->SetPort("7600");
$usc->SetUsername("username");
$usc->SetPassword("password");
/* Perform the request */
$usc->Request("run 'df -h >> /tmp/disk.txt' now then every 30 seconds");
from usched import *
usc = Usched()
/* Optional remote parameters. Not required for localhost requests */
usc.SetHostname("remote.usched.example.com");
usc.SetPort("7600");
usc.SetUsername("username");
usc.SetPassword("password");
/* Perform the request */
usc.Request("run 'df -h >> /tmp/disk.txt' now then every 30 seconds")
uSched is licensed under the GNU General Public License version 3.
The best way to do it is through GitHub. Clone it, fork it, change it and improved it. Then check the project wiki for details regarding the submission of contributions.
- Tree v0.1 of the project is now considered stable.
- Tree v0.2 is under development and may not be fully functional.
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