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heyyy
July 13th, 2009, 12:36 PM
i'm just curious about what does this line mean...


CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)

prshah
July 13th, 2009, 12:39 PM
CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)

execute the following command

check if /usr/sbin/update-motd exists (message of the day)

AND (if it exists, then)

execute it, and

redirect errors to null

Essentially, it probably updates the Message Of The Day (MOTD) which is displayed usually during logon.

JohnFH
July 13th, 2009, 01:11 PM
execute the following command

check if /usr/sbin/update-motd exists (message of the day)

AND (if it exists, then)

execute it, and

redirect errors to null

Essentially, it probably updates the Message Of The Day (MOTD) which is displayed usually during logon.

Slight correction: -x tests if the file is executable.

update-motd: https://wiki.ubuntu.com/UpdateMotd

heyyy
July 13th, 2009, 03:12 PM
so i guess its a default function from the system...but im still curious on what exactly does...? here are some more details


.... ... (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)
/USR/SBIN/CRON[9424]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)
/USR/SBIN/CRON[10002]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd hourly 2>/dev/null)
/USR/SBIN/CRON[10005]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)
/USR/SBIN/CRON[10759]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)
/USR/SBIN/CRON[11280]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
/USR/SBIN/CRON[11571]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)
/USR/SBIN/CRON[12235]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)
/USR/SBIN/CRON[12978]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)
/USR/SBIN/CRON[13695]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)
/USR/SBIN/CRON[14436]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd hourly 2>/dev/null)
/USR/SBIN/CRON[14439]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)
/USR/SBIN/CRON[15314]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)
/USR/SBIN/CRON[15926]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
/USR/SBIN/CRON[16222]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)
/USR/SBIN/CRON[17009]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)
/USR/SBIN/CRON[17783]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)
/USR/SBIN/CRON[18565]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)
/USR/SBIN/CRON[19335]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd hourly 2>/dev/null)
/USR/SBIN/CRON[19338]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)
......

JohnFH
July 13th, 2009, 03:23 PM
Did you read the link in my last post?

Here's another link: https://help.ubuntu.com/9.04/serverguide/C/update-motd.html