Compare two variables and print the difference


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# 8  
Please become accustomed and tightly adhere to telling people in here your OS and shell versions with every new thread! Solutions given above rely on being run with a recent bourne shell, like bash or ksh.
Using shell arrays is an apt approach for tasks like given, eliminating "horizontal" and "vertical" problems. Both rdrtx1 and Chubler_XL use it, (set -A being ksh- specific). Make sure your shell provides arrays. If you run your scripts in e.g. sh, none of the proposals will work.

Try (recent bash required)


Code:
PRIM_SEQ=($(some sql code))
STDBY_SEQ=($(some sql code))
for i in ${!PRIM_SEQ[*]}; do echo $(( PRIM_SEQ[i] - STDBY_SEQ[i] )); done
150
80


Last edited by RudiC; 08-06-2019 at 10:17 AM.. Reason: correction of typo (STB <-> STDBY), thanks to wisecracker!
This User Gave Thanks to RudiC For This Post:
# 9  
Hi amar1208...

Just a note reference rdrtx1's post #2:
The first line should read something like #!/bin/bash as 'sh' assumes POSIX compatibility so ARRAYS are technically not possible.
Make sure you are using bash, ksh or another advanced shell to get that facility.

--- Post updated at 02:26 PM ---

I hope this does not attach itself to my previous:
RudiC's code works absolutely fine on bash version:
Code:
GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin18)
Copyright (C) 2007 Free Software Foundation, Inc.

Modified with real commands and fixed values:
Code:
#!/bin/bash
PRIM_SEQ=($( python -c "print('200 100')" ))
STDBY_SEQ=($( echo "50 20" ))
for i in ${!PRIM_SEQ[*]}; do echo $(( PRIM_SEQ[i] - STDBY_SEQ[i] )); done

Note to RudiC:
'STB_SEQ' should read 'STDBY_SEQ'...

Last edited by wisecracker; 08-06-2019 at 09:42 AM.. Reason: Sigh, second upload attached to my previous!
This User Gave Thanks to wisecracker For This Post:
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