generic blog of schmidi2

If you wanna to someting like this:

for I in $(zgrep -H “from=<test@google.com>” /var/logs/*.gz 2>/dev/null)
do
  LOG_FILE=”`echo $I | cut -d ‘:’ -f 1`”
  DATETIME=”`echo $I | cut -d ‘:’ -f 2-4 | cut -d ‘ ‘ -f 1-3`”
  MAILID=”`echo $I | cut -d ‘:’ -f 5 | cut -d ‘ ‘ -f 2`”
  RECIPIENT_ADDR=”`zgrep $MAILID $LOG_FILE | grep ‘to=’ | cut -d ‘<’ -f 2 | cut -d ‘>’ -f 1`”
  echo “$DATETIME $RECIPIENT_ADDR”
done

You will notice sooner or later that this doesn’t work this way: The for-loop doesn’t only treat line-breaks as a new element but also space-characters. Well, how can that be solved, fast and easy. This way:

zgrep -H “from=<test@google.com>” /var/logs/*.gz 2>/dev/null | while read I
do
  LOG_FILE=”`echo $I | cut -d ‘:’ -f 1`”
  DATETIME=”`echo $I | cut -d ‘:’ -f 2-4 | cut -d ‘ ‘ -f 1-3`”
  MAILID=”`echo $I | cut -d ‘:’ -f 5 | cut -d ‘ ‘ -f 2`”
  RECIPIENT_ADDR=”`zgrep $MAILID $LOG_FILE | grep ‘to=’ | cut -d ‘<’ -f 2 | cut -d ‘>’ -f 1`”
  echo “$DATETIME $RECIPIENT_ADDR”
done

for L in $(cat lines.txt); do
   grep “$L” second-file.txt;
done

or

cat lines.txt | while read L; do
   grep “$L” second-file.txt
done

it does ONLY work if you use the UNIX line separator (\n). If you access a file, which was created on a windows system, such commands will not return the expected result. You have to convert the input file first. Do that with the little tool called “dos2unix”.