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Old 08-19-2014, 11:33 PM   #1
mdesh
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Submit a job or command at fix interval in hh:mm:ss


Hi,

I want to submit few jobs at fixed interval which is in hh:mm:ss format.

I created a script and able to submit the job by setting the crontabs. The number of crontabs will be equal to the number of jobs. But while submitting a job using crontab, the job is getting submitted in mm:hh:date:month:week format. Its not taking complete submit time format in hh:mm:ss format.

So is there any way that I can submit the jobs exactly using hh:mm:ss format.

Thanks

Mdesh
 
Old 08-19-2014, 11:58 PM   #2
notKlaatu
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I do not know of a tool that literally takes hh:mm:ss as its argument, but there is 'sleep', which takes seconds or minutes or hours. You could write a simple wrapper script to convert your input from hh:mm:ss to just seconds:

Code:
#!/bin/bash

H=$(echo $1 | cut -f1 -d":" )
M=$(echo $1 | cut -f2 -d":" )
S=$(echo $1 | cut -f3 -d":" )

HM=$(echo "$H * 60" | bc)
TM=$(echo "$HM + $M" | bc)
TS=$(echo "$TM * 60" | bc)
TOTAL=$(echo "$TS + $S" | bc)
echo $TOTAL

sleep $TOTAL && $2
That's pretty basic but it does the trick, ie, if I enter

./myscript.sh 00:01:14 'echo "hello world"'

then the shell waits for 74 seconds and then runs 'echo "hello world"' as expected.

If I run
(./myscript.sh 00:01:14 'echo "hello world"')
then it all happens in a subshell so I don't have to watch it sit there and wait. Not sure what your use case is.
 
Old 08-20-2014, 03:06 PM   #3
pwalden
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Try the "at" command.

at 4:23:33 PM <<EOF
my-command
next-command
EOF

at 16:22:01 <<EOF
another-command
EOF
 
1 members found this post helpful.
Old 08-21-2014, 06:49 AM   #4
bulrush15
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The 'at' command runs a job once at the time you specify. You can even run the job on a later day. If the time has passed, it will run the job the next day.

Using cron, you can run jobs every ten minutes, once a day, once an hour, etc. Do 'man crontab' for info and 'man 5 crontab' for the file format.

Make sure the user 'root' is in the /etc/cron.allow file! No documents I found mentioned this part.

Last edited by bulrush15; 08-21-2014 at 06:50 AM.
 
Old 08-21-2014, 08:28 AM   #5
pwalden
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Quote:
Originally Posted by bulrush15 View Post
The 'at' command runs a job once at the time you specify. You can even run the job on a later day. If the time has passed, it will run the job the next day.
Sounded like the hh:mm:ss format was the most important thing, which crontab files do not use. The requirements are not very clear.
 
  


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