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Arithmetic syntax error

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# 1  
Old 10-05-2016
Arithmetic syntax error
Hello,

I am new to shell scripting and getting the error "arithmetic syntax error" on line 55 of my script.

Below is line 55 and 56

Code:
    Backup=$ (( $Year*365+$Day ))
if [[ $PrevHostname = '' ]] then PrevHostname=$Hostname; PrevBackup=$Backup

Error:

Code:
./mksysbChk.ksh: line 56:  *365+as : arithmetic syntax error

Any help to fix this will be appreciated.


Thanks,
Last edited by Don Cragun; 10-05-2016 at 05:48 PM.. Reason: Add CODE tags.
# 2  
Old 10-05-2016
Code:
(( Backup = Year * 365 + Day ))

# 3  
Old 10-05-2016
Sorry, I did not get that. Remove the $ signs and include Backup with the brackets?

---------- Post updated at 03:51 PM ---------- Previous update was at 03:34 PM ----------

After the suggested edit; I get the below error
Code:
syntax error at line 56: `((' unexpected

Last edited by rbatte1; 10-06-2016 at 05:17 AM.. Reason: Added CODE tags for output/error
# 4  
Old 10-05-2016
You can't have a space between the $ and the ((. So, change:
Code:
    Backup=$ (( $Year*365+$Day ))

to:
Code:
    Backup=$(( $Year*365+$Day ))

Inside an arithmetic expansion (i.e., $((expression))), shell variable expansions that expand to numeric strings can be specified using $variable_name or variable_name, so the above can also be specified as:
Code:
    Backup=$(( Year*365+Day ))

and get the same results.
# 5  
Old 10-05-2016
The *365+as in the error message is a bit suspect. What be the contens of $Day?
# 6  
Old 10-05-2016
Code:
let Backup=$Year*365+$Day

# 7  
Old 10-05-2016
Code:
Day=`date|cut -c9-10`                          # into Month(Mmm), Day(##) & Year(##)

---------- Post updated at 04:06 PM ---------- Previous update was at 04:02 PM ----------

Backup=$Year*365+$Day works. Thanks

However, I get an email failure message;
Code:
Final-Recipient: RFC822; hasn318@****.com
Action: failed
Status: 5.0.0
Diagnostic-Code: SMTP; 550 Not permitted
Last-Attempt-Date: Wed, 5 Oct 2016 17:03:40 -0400

Last edited by Don Cragun; 10-05-2016 at 06:14 PM.. Reason: Add CODE and ICODE tags.
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