Crontab with sh message "No MTA installed, discarding output"

[ruyzz]

Hi all:

I have a crontab as follows:
/etc/cron.d

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SHELL=/bin/bash
47 10 * * 2 root /bin/example.sh

but when viewing the status, the following appears:

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ene 08 10:47:01 cln-001 cron[703]: (*system*example) RELOAD (/etc/cron.d/example)
ene 08 10:47:01 cln-001 CRON[7152]: pam_unix(cron:session): session opened for user root by (uid=0)
ene 08 10:47:01 cln-001 CRON[7157]: (root) CMD (/bin/example.sh)
ene 08 10:47:01 cln-001 CRON[7152]: (CRON) info (No MTA installed, discarding output)
ene 08 10:47:01 cln-001 CRON[7152]: pam_unix(cron:session): session closed for user root

Can someone tell me if this message is normal or just can not run it as root?

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ene 08 10:47:01 cln-001 CRON[7152]: (CRON) info (No MTA installed, discarding output)

[gm10]

The facts aside that using sudo in a script run by root is superfluous and the idea of dropping caches via cron is, well, no comment, you didn't specifically configure MAILTO="", so cron is trying mail you the output created by your cron job. Output which is only getting created because of that unnecessary sudo tee construct btw. Also: sysctl vm.drop_caches=3.