eliminating bad emails from a file
You have a file, with an email on each line.
this is the newsletter database for a client.
the emails have been added in this file from a form on the client’s website.
Then he starts to send email to all his users.
20% of the email returned with serious problems. and you have to eliminate those addresses from the file.
So you end up with 2 files one with all emails, and another one with bad ones. One has 1000 lines, the other 200.
You want to automate it, and not to do it by hand. you can’t use diff, as the email addresses are not in the same order.
this script comes to rescue:
#!/bin/sh
declare -a emailsToBeDeleted
declare -a allEmails
emailsToBeDeleted=( `cat $1`)
allEmails=( `cat $2`)
declare -a idxDelete
let idx=0
for toBeDeleted in "${emailsToBeDeleted[@]}"; do
let ctx=0
for email in "${allEmails[@]}"; do
if [ "$email" == "$toBeDeleted" ]
then
idxDelete[$idx]=$ctx
echo "deleting… $ctx $email $toBeDeleted "
idx=$((idx+1))
fi
ctx=$((ctx+1))
done
done
for emailIdx in ${idxDelete[@]}; do
unset allEmails[$emailIdx]
done
for email in ${allEmails[@]}; do
echo $email;
done
$1 represents the argument for the file with all the emails, $2 the file with the email to be deleted.
usage: stripmails.sh allemails.dat bademails.dat > goodemails.dat