Hi,

I cobbled together this somewhat shoddy Bash script to migrate email accounts from our Cyrus server to a new dovecot system. Feel free to use, or laugh at it as you wish :)

#!/bin/bash

## # Migrate email accounts via IMAP from one server to another ##

trap "kill 0" SIGINT

workdir=/root/migrate

# Load list of users into array. The file "migration_map" should contain one user@domain.tld per line. mapfile userList < $workdir/migration_map

# Number of symultanious migrations num=10

index=0

# Loop over the array of user accounts function process_userlist { procs=$(ps aux | grep "dsync" | grep -v "grep" | wc -l) # Perform $num operations at a time for the length of the userList while [[ $procs -lt $num ]] && [[ ${#userList[@]} -gt $index ]]; do procs=$(ps aux | grep "dsync" | grep -v "grep" | wc -l) dsync -o mail_fsync=never mirror -f -R -u ${userList[$index]} imapc:& echo "procs: $procs user: ${userList[$index]} index: $index" let index++ done }

# Until the userList is empty, keep going until [ ${#userList[@]} -eq $index ]; do process_userlist done

exit 0