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Description of problem:
to quote bug 1325088#c8
"Yes, unfortunately cron has a bug that makes it to treat VAR= lines as erroneous although according to the manual page it should be accepted."
I came across this while trying various MAILTO= values ...
Version-Release number of selected component (if applicable):
cronie-1.4.11-17.el7
How reproducible:
always
Steps to Reproduce:
1. modify /etc/crontab to include 'MAILTO=' line and a job that produces some output
2. wait
3. check root's mail
Actual results:
root gets mail with output of the job
Expected results:
root shouldn't get the output of the job
Additional info:
`man 5 crontab`
An active line in a crontab is either an environment setting or a cron command. An environment setting is of the form:
name = value
where the white spaces around the equal-sign (=) are optional, and any subsequent non-leading white spaces in value is a part of the value assigned to name. The value string may be placed in quotes (single or double, but matching) to preserve leading or trailing white spaces.
...
If MAILTO is defined but empty (MAILTO=""), no mail is sent.
^ according to the way environment settings should be parsed, the following three should be equal:
MAILTO=""
MAILTO=''
MAILTO=
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2018:0738