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Old 5th May 2014, 02:48 PM
lsatenstein Offline
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Join Date: Jun 2005
Location: Montreal, Que, Canada
Posts: 4,287
Some Fedora related websites

The following websites are used for my education about Fedora. Thanks to arehtykitna (Mike) for great extras and feedback.[/B}
My favourite Remix distribution RFRemix.

A crontab template
Save as crontab.template
######      FOR ADDITIONAL INFORMATION REFER TO      man 5 crontab  ####
# string         meaning
# ------         -------
# @reboot        Run once, at startup.
# @yearly        Run once a year, "0 0 1 1 *".
# @annually      (same as @yearly)
# @monthly       Run once a month, "0 0 1 * *".
# @weekly        Run once a week, "0 0 * * 0".
# @daily         Run once a day, "0 0 * * *".
# @midnight      (same as @daily)
# @hourly        Run once an hour, "0 * * * *".
# Inherited Vars: $LOGNAME, $SHELL, $HOME, $MAILTO
# To install        cat crontab.template | crontab - 
#                crontab -l (list) crontab -e (edit) crontab -r (delete)
#mm     hh      DoM    Mon     Dow      COMMAND                
#+.......................................Minute of the hour (0..59)
#|      +--------------------------------Hour in the day (0..23)
#|      |       +........................Day of month, 1..31 
#|      |       |       +----------------Month (1.12) Jan, Feb.. Dec    
#|      |       |       |       +........day of the week 0-6  7==0 or (sun,mon,tue,wed,thu,fri,sat)     
#|      |       |       |       |        |command to be executed
#V      V       V       V       V        V
10      9       *       *       mon,thu  /usr/sbin/fstrim  -a #trim all SSDs every mon,thu @ 9:10am
0-30/5  */2  28-31      *       *        [ `date -d +'1 day' +\%d` -eq 1 ] && echo "$(date): RUN your month-end jobs today" >> ${HOME}/message
#0-30/5 --every multiple of 5 minutes in the first half hour of each hour, 0-23/2 (*/2) every other hour( for preceding line) 
1       *       2       *       *        rm ~/message                            #clean up
@daily                                   /usr/bin/find $HOME -name core 2>/dev/null | xargs rm -f >/dev/null 2>&1[
Man crontab for crontab -e , crontab -l and crontab -r
If you have a crontab template (see above) sudo cat crontab.template | crontab

Concerning the line used to generate an entry in "message". You should put in the range as for example, 0-59/5 , which is parsed as every other five minutes in the hour. SImilarly 0-23/2 means every other hour in the day. If you only wanted a message every 5 minutes of every other working hour, change */2 to 9-17/2. Note the rm ~/message for the 2nd of the month.

Burning on ISO to flashdrive (if you already have a Linux (You may also use a liveCD linux version

LiveCD only
If your live CD does not include Gparted, enter terminal mode to command line prompt.
logon root
To respond to password prompt, just hit enter. With Most liveCD versions, the root password is not required.
Use dnf or if you have Fedora version earlier than 22, use yum
dnf install gparted or yum install gparted and return to GUI interface

sudo su
gparted  # to determine the /dev/sdX for your flash drive.  
cd Downloads  # or where you have downloaded the ISO(s).
dd if=ISO_I_WANT_TO_PUT_TO_FLASH.iso  of=/dev/sdX  bs=1M   && sync  # Use 1meg buffer in place of default 512bytes
umount /dev/sdX
exit; exit
That flash drive is ready for booting.

If writing to a DVD, I use k3b -- well known to be excellent

Want to power down installed but rarely used spinning hard disks?
My system has 4 spinning disks A-D and one SSD. I use the SSD mostly, and one other disk for end of day backup.
I use the following hdparm command. hdparm - get/set SATA/IDE device parameters

 sudo /sbin/hdparm -q -S 6 /dev/sd{a,b,c,d}
#for /dev/sda, /dev/sdb, /dev/sdc,/dev/sdd
Optionally for Western Digital desktop drives which have a default setting, (heads park every 8 seconds after being idle, extend this to 30 seconds)

 sudo /sbin/hdparm -q -J 30  /dev/sd{a,b,c,d}
For more information about hdparm, try man hdparm, or HDPARM EXAMPLES


Leslie Satenstein is a "he" Leslie.
Leslie in Montreal

Interesting web sites list

Last edited by lsatenstein; 20th August 2017 at 08:55 AM. Reason: updates.
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