Shell Programming and Scripting

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while read line; do
((half=${#line}/2))
echo $line | awk '{print substr($0,1,$half)}'
done < $TEMP_1

grep '^\(.*\)\1$' file

while read line; do
   ((half=${#line}/2))
   halfline=`echo $line | awk '{print substr($0,1,$half)}'`
   if [ "${halfline}${halfline}" = "${line}" ]
   then
      echo "${line} is a duplicated entry"
   else
      echo "${line} is not repeated"
   fi
done < $TEMP_1 > logfile

while read line; do
   ((half=${#line}/2))
   h=1                                           # Set a counter
   mask=                                         # Null the variable
   until [ $h -gt $half ]                        # Loop until counter is right
   do
      mask="${mask}?"                            # Add a ? (single character wildcard)
      ((h=$h+1))
   done
   halfline="${line#${mask}}"                    # Split the line
   if [ "${halfline}${halfline}" = "${line}" ]   # Match twice the split line with the original
   then
      echo "${line} is a duplicated entry"
   else
      echo "${line} is not repeated"
   fi
done < $TEMP_1 > logfile

grep 'somestuff' | sed 's/afew bits/g' | grep '^\(.*\)\1$' |

while read line; do
echo $line | grep '^\(.*\)\1$'
done < $TEMP_1

#!/bin/bash

while read value; do 
 len=${#value}
 center=`expr $len / 2`
 firsthalf=${value:0:center}
 secondhalf=${value:center:len}
  if [ "$firsthalf" == "$secondhalf" ]; then
   echo "$value"
  fi
done <values >truedupes