A command-line scheduler with an almost-natural language interpreter. It also delivers a powerful 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 specificied interval, and optionally stopping them at any other particular time.

It provides a simple and intuitive structured 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 operating system. There are some features that may not be enabled by default in the case that some non-portable calls being unavailable for 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/master.tar.gz
  ~# tar zxvf master.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

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

Reference Manual in HTML format:

• http://doc.usched.org/uSched_Reference_Manual.html

Reference Manual in PDF format:

• http://doc.usched.org/uSched_Reference_Manual.pdf

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:

• INSTALL.txt

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();
      
      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();
              
              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();
          
          usc.Request("run 'df -h >> /tmp/disk.txt' now then every 30 seconds");
      }
  }

  include("usched.php");
  
  $usc = new Usched();
  
  $usc->Request("run 'df -h >> /tmp/disk.txt' now then every 30 seconds");

  from usched import *
  
  usc = Usched()
  
  usc.Request("run 'df -h >> /tmp/disk.txt' now then every 30 seconds")

The current project revision is on an beta stage and shall not be used beyond testing purposes.