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problem in algebraic expression

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# 1  
Old 04-25-2012
problem in algebraic expression
Code:
count=`cat /filecount.txt | tail -1 |head -1| awk '{print $1}'`

exact_count=`expr $value \* 24`

i want to subtract
Code:
a="$exact_count" - "$count"

but its not taking o/p of "count" as number
$a is wrong answer

hence not getting proper output.

plz help me out

Smilie

Moderator's Comments:
Mod Comment Please use [code] tags. Video tutorial on how to use them
# 2  
Old 04-25-2012
In ksh:
Code:
# value=4                        
# (( exact_count = value * 24 )) 
# echo $exact_count
96
# count=10
# (( a = exact_count - count  ))    
# echo $a
86

# 3  
Old 04-25-2012
Try:
Code:
a=$(( exact_count - count ))

# 4  
Old 04-25-2012
Quote:
Originally Posted by Klashxx
In ksh:
Code:
# value=4                        
# (( exact_count = value * 24 )) 
# echo $exact_count
96
# count=10
# (( a = exact_count - count  ))    
# echo $a
86

its not working

i think there is problem in command
Code:
count=`cat /home/bsnl/sagar/filecount.txt | tail -1 |head -1| awk '{print $1}'`

its not taking o/p as number plz suggest some thing

---------- Post updated at 04:47 AM ---------- Previous update was at 04:46 AM ----------

Quote:
Originally Posted by Scrutinizer
Try:
Code:
a=$(( exact_count - count ))


ts not working

i think there is problem in command

Code:
count=`cat /home/bsnl/sagar/filecount.txt | tail -1 |head -1| awk '{print $1}'`

its not taking o/p of this as "number"

hence not working

o/p of script is like this

Quote:
actual count = 528
exact_count= 528
temp[52]: 528: not found.
temp[55]: exact_count: not found.
value is &a
Last edited by sagar_1986; 04-25-2012 at 07:16 AM.. Reason: Please use code tags
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