If you are writing a bash script and you want to increment a counter variable, below are five ways in which you can do it.
Option 1: Using += operator
#!/bin/bash
counter_variable=0
((counter_variable+=1))
echo $counter_variable
Output:
Option 2: Using let command
#!/bin/bash
counter_variable=0
let "counter_variable=counter_variable+1"
echo $counter_variable
Output:
Option 3: Using arithmetic expansion
#!/bin/bash
counter_variable=2
((counter_variable++))
echo $counter_variable
Output:
Option 4: Using expr command
#!/bin/bash
counter_variable=5
counter=$(expr $counter_variable + 1)
echo $counter_variable
Output:
Option 5: Using (( )) construct
#!/bin/bash
counter_variable=9
((counter_variable++))
echo $counter_variable
Output:
![Example - Increment counter variable in bash Example - Increment counter variable in bash](https://code2care.org/howto/ways-to-increment-counter-variable-in-bash-script/images/Example - Increment counter variable in bash.jpg)
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