finding an email address inside an mbox file
Assuming the mbox has been saved into a file called thefile.txt:
grep -E -o "\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,6}\b" thefile.txt
ZFS syntax (updated)
Introduction ZFS is an alternative filesystem. It allows RAID, deduplication and compression. You create a collection of drives as a 'pool'. That's useful if you want many drives as one big drive. Suppose you have two spare drives, sdc1 and sdd1. To make them into one big drive with deduplication and no compression, do this. Deduplication = where it doesn't make multiple copies of identical files, just marks them as copies. Creating a ZFS pool (drive collection) zpool create -f zfspool /dev/sdc1 /dev/sdd1 zfs set compression= off zfspool zfs set dedup= on zfspool zpool list df -h you'll see it is mounted as /zfspool A zfs snapshot is a read-only copy of zfs file system or volume. They consume no extra space in the zfs pool and can be created instantly. They can be used to save a state of file system at particular point of time and can later be rolled back to exactly same state. LVM is similar to ZFS but doesn't offer all these other features. (In my e