CODEWITHSUNDEEP
macosbashshelldatetimescripting
Geofferey
Geofferey

Reputation: 3422

Execute command in script based on year

I have a Powerbook with a dead laptop battery... Everytime I disconnect it from it's power source the date gets set back to the year 1969. This leads to some issues with network authentication, keychain access, etc. I wrote a launch daemon that executes this script in order to set the date to something more appropriate at boot, which works fantastically. 

  #!/bin/bash

  date 0101122014

Now I only want it to only run if the year is 1969, that way if the time is correct it won't get set back at all.

so something like... 

  #!/bin/bash

  YEAR="date +%Y"

  if [ $YEAR = 1969 ] ;
  then date  010112002014 
  else exit 0
  fi

I know the syntax is totally off, it's just to give an idea of what I want to do. Thanks for any help in advance.

Upvotes: 0

Views: 106

Answers (5)

Geofferey
Geofferey

Reputation: 3422

So I got everything setup with your guys help & it works great. I used one script and a launch daemon to set, save & set time via ntp. Here they are :) There are a million ways to skin a cat this is how I skinned mine.

Heres the script:

#!/bin/bash


#Load variables from .conf file 

. /usr/share/fixes/time/time.conf


#Variables

DATE=$(date +%m%d%H%M%Y)


#Check year & set time from variable in .conf file

[ $(date +%Y) = 1969 ] && date $TIME


#Update time via ntp server

ntpdate -u $(systemsetup -getnetworktimeserver|awk '{print $4}')


#Save time to variable in .conf file 

sed -i -e "s/^TIME=.*/TIME=$DATE/" /usr/share/fixes/time/time.conf


exit 0

& launch daemon .plist for OSX which runs script every 3 minutes:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>com.fix.settime</string>
    <key>ProgramArguments</key>
    <array>
        <string>./usr/share/fixes/time/time-fix.sh</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
    <key>StartInterval</key>
    <integer>180</integer>
</dict>

Thank you to all those that helped, I really appreciate it and feel I have learned something from all of you once again.

Upvotes: 0

clt60
clt60

Reputation: 63972

Another approach

#!/bin/bash

monfile="/tmp/.com.example.touchfile"

#if have OK (current) date set the file modification time
have_current_date() {
        date > "$monfile"
}

#set the date from the last file modification time
have_wrong_date() {
        [ -f "$monfile" ] || touch -t 201401010101 "$monfile"
        eval $(stat -s "$monfile")   #get the file modification time to shell variable
        date -f '%s' $st_mtime   #set the date to "last" file modification time
}

#main program
YEAR=$(date +%Y)
case "$YEAR" in
        2014) have_current_date ;;      
        *) have_wrong_date ;;
esac

what is doing

  • get the actual system date
  • if the year is 2014 - touch the $monfile - set the file modification time to current time
  • if the year isn't 2014 get the "last" file modification time and set the system date from it

Upvotes: 2

Farvardin
Farvardin

Reputation: 5424

simple one using if :

if [ $(date +%Y) = 1969 ]
then date 010112002014
else exit 0
fi

Upvotes: 1

Jonathan Leffler
Jonathan Leffler

Reputation: 754820

Use command substitution:

YEAR=$(date +%Y)

Or even:

[ $(date +%Y) = 1969 ] && date 010112002014

Or, using an if:

if [ $(date +%Y) = 1969 ]
then date 010112002014
fi

Upvotes: 1

Aaron Digulla
Aaron Digulla

Reputation: 328770

Execute this command to set the date:

sudo ntpdate -u time.apple.com

ntpdate will query the specified time server for the current date/time and then update the local time.

Note: The error in your script is YEAR="date +%Y": that just assigns the string date +%Y to YEAR. But you want to execute date +%Y and assign the result:

YEAR=$(date +%Y)

Related:

Upvotes: 3

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