bash for loop variable counter code example

Example 1: increment number bash

i=$((i+1))
((i=i+1))
let "i=i+1"

Example 2: bash loop counter

TEMPFILE=/tmp/$$.tmp
echo 0 > $TEMPFILE

# Loop goes here
  # Fetch the value and increase it
  COUNTER=$[$(cat $TEMPFILE) + 1]

  # Store the new value
  echo $COUNTER > $TEMPFILE

# Loop done, script done, delete the file
unlink $TEMPFILE

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