Shell Programming and Scripting

 
for DETAIL_FILE in `find ${MY_DATAFILE_LOCATION} -type f`
do
  grep -a TIMESTAMP ${DETAIL_FILE} |cut -d: -f2 |grep -v "-" |sed 's/^ *//' |sort -un > ${MY_DATAFILE_LOCATION}timestamp.txt
  while read UNIQUE_TIMESTAMP
  do
    HUMAN_READABLE_TIMESTAMP=`date +%F" "%T -d@${UNIQUE_TT_TIMESTAMP}`
    sed -i "s/TIMESTAMP: ${UNIQUE_TT_TIMESTAMP}/TIMESTAMP: ${HUMAN_READABLE_TIMESTAMP}/g" ${DETAIL_FILE}
  done<${MY_DATAFILE_LOCATION}timestamp.txt
done

OLDIFS=$IFS
IFS=$': \t'
grep -d recurse "TIMESTAMP: [0-9]*$" ${MY_DATAFILE_LOCATION} | while read DETAIL_FILE ignore UNIQUE_TIMESTAMP
do
   HUMAN_READABLE_TIMESTAMP=`date +%F" "%T -d@${UNIQUE_TIMESTAMP}`
   sed -i "s/TIMESTAMP: ${UNIQUE_TIMESTAMP}/TIMESTAMP: ${HUMAN_READABLE_TIMESTAMP}/g" ${DETAIL_FILE}
done
IFS=$OLDIFS

grep -d recurse -l "TIMESTAMP: [0-9]*$" ${MY_DATAFILE_LOCATION} | xargs -r awk '
/TIMESTAMP: [0-9]*$/ { $0=$1 " " strftime("%F %T", $2) }
{ L[FILENAME]++; line[FILENAME,FNR]=$0 }
END { for(file in L) {
          for(i=1;i<=L[file];i++) print line[file,i] > file
          close(file) }}'