Question

How to increment and decrement variable in Bash

Answer 1

i=12

i=$((i+1))

echo $i

i=$((i-3))

echo $i  
  

  
  
# run:
#
# 13
# 10
#

 

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Answer 2

i=12

((i=i+1))

echo $i

((i=i-3))

echo $i  
  

  
  
# run:
#
# 13
# 10
#

 

70+ SQL courses for beginners and professionals

Answer 3

i=12
 
((i+=1))
 
echo $i
 
((i-=3))
 
echo $i  
   
 
   
   
# run:
#
# 13
# 10
#

 

70+ SQL courses for beginners and professionals