MobileRead Forums - View Single Post - Kindle 3 as Morning Alarm and other things! ( crontab utility does)

kt23 · 11-09-2011, 09:10 AM

I have a kindle 3, now it can play a sound at morning, so I say kindle is used as an alarm. Yes, I use the crontab. Maybe you can use it to do other useful and interesting things.

Steps:

1. jailbreak. thanks NiLuJe and others
Font and Screensaver Hacks - The current jailbreak and USBNetworking hacks are also included here
https://www.mobileread.com/forums/showthread.php?t=88004

2. Kindle SSH over WIFI instructions. thanks badbob001
https://www.mobileread.com/forums/sho...85&postcount=8

3. mplayer install to /mnt/us/system/mplayer ; then copy a sound file (ex. miaoyin.mp3) to /mnt/us/music/miaoyin.mp3
mplayer can get at https://www.mobileread.com/forums/showthread.php?t=147854&highlight=mplayer thanks for sharing

4. Now suppose you get the root shell. the key is to change the crontab file: /etc/crontab/root, pls see below

Code:

#################################################
#  N O T I C E  *  N O T I C E  *  N O T I C E  #
#################################################
Rootfs is mounted read-only. Invoke mntroot rw to
switch back to a writable rootfs.
#################################################
[root@kindle root]# mntroot rw
system: I mntroot:def:Making root filesystem writeable
[root@kindle root]# chmod +w /etc/crontab/root
[root@kindle root]# vi /etc/crontab/root
### use vi to edit the file , to add a line 

[root@kindle root]# cat /etc/crontab/root
*/15 * * * * /usr/sbin/checkpmond
*/15 * * * * /usr/sbin/tinyrot
*/60 * * * * /usr/sbin/loginfo tmpfs
*/60 * * * * /usr/sbin/loginfo localVars
*/60 * * * * /usr/sbin/loginfo memusedump
*/15 * * * * /usr/sbin/loginfo powerdcheck
8 6 * * 1-5 /mnt/us/system/mplayer /mnt/us/music/108.mp3
[root@kindle root]# /etc/init.d/cron restart
system: I cron:def:stopping crond
start-stop-daemon: lseek: Invalid argument
system: I cron:def:starting crond
[root@kindle root]# mntroot ro
system: I mntroot:def:Making root filesystem read-only
[root@kindle root]#

5. OK now at 6:08 AM from Mon. to Fri., Kindle 3 will play the file miaoyin.mp3.

6. Done. I know little about shell, maybe you can do more for yourself.

WARNING: DO THIS ON YOU OWN RISK.

Good luck :)

crontab can do more fun things? please post it!

11-09-2011, 09:10 AM	#1
kt23 Junior Member Posts: 6 Karma: 10 Join Date: Nov 2011 Device: none	Kindle 3 as Morning Alarm and other things! ( crontab utility does) I have a kindle 3, now it can play a sound at morning, so I say kindle is used as an alarm. Yes, I use the crontab. Maybe you can use it to do other useful and interesting things. Steps: 1. jailbreak. thanks NiLuJe and others Font and Screensaver Hacks - The current jailbreak and USBNetworking hacks are also included here https://www.mobileread.com/forums/showthread.php?t=88004 2. Kindle SSH over WIFI instructions. thanks badbob001 https://www.mobileread.com/forums/sho...85&postcount=8 3. mplayer install to /mnt/us/system/mplayer ; then copy a sound file (ex. miaoyin.mp3) to /mnt/us/music/miaoyin.mp3 mplayer can get at https://www.mobileread.com/forums/showthread.php?t=147854&highlight=mplayer thanks for sharing 4. Now suppose you get the root shell. the key is to change the crontab file: /etc/crontab/root, pls see below Code: ################################################# # N O T I C E * N O T I C E * N O T I C E # ################################################# Rootfs is mounted read-only. Invoke mntroot rw to switch back to a writable rootfs. ################################################# [root@kindle root]# mntroot rw system: I mntroot:def:Making root filesystem writeable [root@kindle root]# chmod +w /etc/crontab/root [root@kindle root]# vi /etc/crontab/root ### use vi to edit the file , to add a line [root@kindle root]# cat /etc/crontab/root /15 * * * /usr/sbin/checkpmond /15 * * * /usr/sbin/tinyrot /60 * * * /usr/sbin/loginfo tmpfs /60 * * * /usr/sbin/loginfo localVars /60 * * * /usr/sbin/loginfo memusedump /15 * * * /usr/sbin/loginfo powerdcheck 8 6 * * 1-5 /mnt/us/system/mplayer /mnt/us/music/108.mp3 [root@kindle root]# /etc/init.d/cron restart system: I cron:def:stopping crond start-stop-daemon: lseek: Invalid argument system: I cron:def:starting crond [root@kindle root]# mntroot ro system: I mntroot:def:Making root filesystem read-only [root@kindle root]# 5. OK now at 6:08 AM from Mon. to Fri., Kindle 3 will play the file miaoyin.mp3. 6. Done. I know little about shell, maybe you can do more for yourself. WARNING: DO THIS ON YOU OWN RISK. Good luck :) crontab can do more fun things? please post it!