Shell Programming and Scripting

#!/bin/bash
while read -r line; do #I'm reading from a big wordlist
instructions using $line
done

#!/bin/bash
CPT=0
while read -r LINE #I'm reading from a big wordlist
do
       CPT=$((CPT+1))
       instructions using $LINE
       echo "CPT="$CPT > ~/interrupted_at_line.log #will be in your $HOME
done

#!/bin/bash

TMP_FILE="/tmp/currentLineNumber"                         # a constant

current_line_count=0                                      # track the current line number

processed_lines_count=0

# Verify if we have already processed some stuff.
if [ -r "${TMP_FILE}" ]; then
  processed_lines_count=$(cat ${TMP_FILE})
fi

while read -r line; do                                    # I 'm reading from a big wordlist

    # Skip processing till we reach the line that needs to be processed.

    if [ $current_line_count -le $processed_lines_count ]; then

      # do nothing as this line has already been processed
      current_line_count=$((current_line_count+1))        # increment the counter
      continue

    fi

    current_line_count=$((current_line_count+1))
    echo $current_line_count > ${TMP_FILE}                # cache the line number

    # perform your operations
    command1 using $line
    command2 using $line

done