This file is indexed.

/etc/crontab is in systemd-cron 1.5.3-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# Start @daily/@weekly/@monthly jobs at 6 o'clock
# instead of midnight
#START_HOURS_RANGE=6

# m h dom mon dow user	command
#17 *	* * *	root    cd / && run-parts --report /etc/cron.hourly
#25 6	* * *	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
#47 6	* * 7	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
#52 6	1 * *	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )

# when using systemd-cron, these 4 standard cron jobs are disabled
# because this is already handled natively by
# /lib/systemd/system/cron-{hourly,daily,weekly,month}.*
# these are only left here as an example of how to write a crontab