אכן הברחה עם \ פתרה את הבעיה!
אבל לא מצאתי לזה שום אזכור בman.
בכל אופן, תודה רבה!
קוד:
$ man 5 crontab | grep -C5 slash
The ``sixth'' field (the rest of the line) specifies the com-
mand to be run. The entire command portion of the line, up to
a newline or % character, will be executed by /bin/sh or by
the shell specified in the SHELL variable of the crontab file.
Percent-signs (%) in the command, unless escaped with back-
slash (\), will be changed into newline characters, and all
data after the first % will be sent to the command as standard
input. There is no way to split a single command line onto
multiple lines, like the shell's trailing "\".
Note: The day of a command's execution can be specified by two