In this blog, sharing the code to find the first repeated Character in a string. Consider a String “allabouttechnologies“, here l and t are the repeated Characters but l is the first repeated Character. str=”allabouttechnologies” ## Sample Stringn=${#str} ##Length of a StringPrevChar=${str:0:1} ## Set PrevChar as first character of a Stringi=1while [[ $i -lt $n ]] ## Looping through each character of a stringdoNextChar=${str:$i:1} ## Assigning NextChar equals to current Character in the Loopif [[ $PrevChar == $NextChar ]] ## Comparing consecutive Characters of a string in a loop, if…