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"hcron conv" program converts, in both directions, between crontab and hcron.

From cron to hcron

  • For each command and the preceding comments of the command of a crontab file are written to individual event files starting a name "0".
  • Variables and percent sign handling are ignored.
  • The hostname parameter of "hcron conv" is required in order to fill in the hcron host field.
  • Optionally, an email address can be provided using the --mail option in order to fill in the hcron notify_email field.


crontab -l > crontab.copy
mkdir crontab.conv
hcron conv --to-events hcron-server crontab.copy crontab-conv

The results are in crontab-conv/ .

In many cases, the conversion from crontab to hcron is lossless.

From hcron to cron

  • Each event file in a specified directory is used to generate a single crontab entry.
  • If the hcron host field is not empty, the command for the new crontab entry is prepended with ssh <host>.
  • Variables and comments are ignored.
  • Optionally, a remote shell other than ssh can be specified using the --remoteShell option.


hcron conv --to-crontab crontab.from_hcron hcron_dir

The results are in the crontab.from_hcron  file.

If variables are used, conversion from hcron to crontab may not produce useful results or will require a bit of massaging.