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Use of expr to calc differenc ein to epoch values

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Top Forums Shell Programming and Scripting Use of expr to calc differenc ein to epoch values
# 15  
Old 05-02-2018
please use code tags.
# 16  
Old 05-02-2018
If the numbers involved are simple integers (which seconds from the Epoch should be) then why not do something smarter, such as replacing
Code:
DATE_DIFF=`expr ${CHECK_DATE_1} - ${INSERT_TIME}`

with
Code:
((DATE_DIFF=${CHECK_DATE_1}-${INSERT_TIME}))

You can probably use a let statement or other shell coding and these save the effort of creating a subshell to run expr in.


It might not solve your problem, but it could be a better practice, especially if you are reading large files and doing lots of calculations.



Robin
# 17  
Old 05-02-2018
is there an exit i should be using somewhere?

It seems to be trying to use another empty line but I cant see one anywhere
# 18  
Old 05-02-2018
Can you post the output from this little script:-
Code:
#!/bin/bash

while read line
do
   printf "I have read \"${line}\" from the file.\n\n"
done < /tmp/longrunmon.out


Please carefully wrap it in CODE tags so we can be clear what the output is.


Thanks, in advance,
Robin
# 19  
Old 05-02-2018
Code:
> 
server:/home/oracle>while read line
> do
>    printf "I have read \"${line}\" from the file.\n\n"
> done < /tmp/longrunmon.out

output
Code:
I have read "testinst2,10,1525186184" from the file.

I have read "testinst,10,1525186184" from the file.

server:/home/oracle>

Maybe its that empty lines that has appeared? not quite sure how they appear?
Last edited by jonnyd; 05-02-2018 at 01:01 PM..
# 20  
Old 05-02-2018
are there any ^M-s in the file you're reading from?
do cat -vet /tmp/longrunmon.out and post the output (in code tags).
# 21  
Old 05-02-2018
there are $ signs:

Code:
lit-dbracm01-p002:/home/oracle>cat -vet /tmp/longrunmon.out
testinst2,10,1525186184$
testinst,10,1525186184$

is that normal?
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