$ crontab -?
crontab: illegal option -- ?
crontab: proper usage is:
crontab [file | -e | -l | -r ] [user]
$
Here is the usage according to the man page:
SYNOPSIS
crontab [filename]
crontab [-elr] username
In particular, I tried following the usage string with:
crontab file user
and it failed.
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