purgezfs is created to purge/delete ZFS snapshot of a user (Solaris 10+, Linux ZOL project, tested EL/RHEL 6x, 7x, 8x)
(C)  Rejean Lepage, from April 2008 to April 2023.

lepage (at) grm.polymtl.ca
GRM, Ecole Polytechnique de Montreal.
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Latest devel in progress...


 version purgezfs 2.74 (April 04, 2023)
  2023-04-04: can find nextcloud in mypool/home2/nextcloud if getent home is not local and set in /users2/nextcloud

 version purgezfs 2.73 (August 26, 2022)
  - # version 2.73: 2022-08-26:   ## BUG EL6: df will not show /usr/local in the mount list
  - EL6 # % df -l -h /usr/local == df: no file systems processed

 version purgezfs 2.72 (Mars 30, 2021)
  - # version 2.72: 2021-03-30: '/users/nnnnnn': not a ZFS filesystem - bug apres update zfs ??? back to df ligne 474

 version purgezfs 2.71 (June 20, 2019)
  - add option -D to disable auto snapshot @purgezfs_auto

 version purgezfs 2.70 (June 19, 2019)
  - add option -P to select zpool

 version purgezfs 2.68 (oct 29, 2018)
  - add option --nc | -nocheck | --nocheck will not check for updates 
  - el6 /bin/tail missing while el7 /usr/bin/tail and /bin/tail exist
  - modif echo and Echo
  - add option -n | --dry | --dry-run  will actually do nothing 

 version purgezfs 2.67 (oct 25, 2018)
  - sudoer user message
  - versose forgot to shift
  - ignore mounted snapshot home@snapshot
  - test for params in while with quote "" = "unary operator expected"
  - test for params -h as user fail to display usage

 version purgezfs 2.66 (Aug 16, 2018)
      - bug fix with EL6, EL7 does not react the same with df
      - bug fix when no getent = quit.
      - add verbose for debug
      - bug fix when reply is n (ok y or q) return 0 (-1 fail on linux)

 version purgezfs 2.65 (Aug 15, 2018)
      - bug fix  BUG: confused zfs et nfs (nfs:/mypool/users vs /mypool/users)
      - better explain what is what. display of msg.

 version purgezfs 2.64 (July 11, 2018)
      - bug fix  BUG: /CMC trouve pas... 
      - Add a requirement: each FS/ZFS should have a username assiated with

 version purgezfs 2.63 (July 11, 2018)
      - bug fix  BUG: because of user 4205_1 having a home in 4205/1

 version purgezfs 2.62 (March 18, 2014)
      - bug fix looking for user lepage will also find user lepage2 - fixed with egrep end of word '\>'

 version purgezfs 2.61 (March 18, 2014)
      - bug fix looking for user lepage will also find user lepage2 - fixed

 version purgezfs 2.60 (March 17, 2014)
      - now support ZOL and Linux
      - added support for ZOL (ZFS on Linux) and little clean up

 version purgezfs 2.52 (March 17, 2014)
      - minor bug when find several home zfs
      - adding warning and messages updates 

 version 2.51: May 27, 2013
      - set auto snapshot name to purgezfs_auto
      - delete it before creation.

 version 2.5: March 4, 2013
      - decide to name 2.5 since it's a big change
      - add month snapshot after purge
      - message update
      - version text typo

 version 2.4: August 25, 2009.
      - added a more specific message to go on the ZFS server.
      - performance fixed issue with sorting zfs list while searching for the home directory.

 version 2.3: April 9, 2009.
      - added a message that it could take a while to search for snapshot.

 version 2.2: Sept 11, 2008.
      - bug fix, when no snapshot available do nothing.

 version 2.1: June 9, 2008.
      - add GPL
      - bug fix, grep something that does not exist will return all snapshot.
      - display header to snapshot size only if we are in validation mode.
      - Snapshot deletion message change.

 version 2.0: June 6, 2008.
      - auto find the user zfs pool if user_zpool not defined
      - display snapshot refering size and referer in a format
      - bug fixed with error display when unkown user "cannot open '': dataset does not exist"
      - mod using zfs command with correct option to get zpool, zfs, size
      - optimizing speed to display snapshot and size with zfs command 
      - Defining all shell command thru vars
      - remove message about no new version
      - addind size info header

 version 1.4: June 5, 2008.
      - automatically relaunch with sudo when user forget to type sudo
      - renaming of some vars
      - split version into (purgezfs version_no version date)

 version 1.3.1: Mai 22, 2008.
      - minor testing for auto find the user zfs pool
      - typo Download it...

 version 1.3: Mai 20, 2008.
      - just "sudo purgezfs" will cause missing parameter for normal users, fixed.
      - check for latest version with wget
      - --update | -u | -update option added
      - add project web page in usage
      - typo on date
      - typo on option detected.
      - version number modif
      - web site must have 2 files for wget to work. version and purgezfs
      - user must have wget installed 

 version 1.2: Mai 12, 2008. 
      - typo
      - change quote in grep string
      - when in user mode with sudo do not require a username, do only the current user 

 version 1.1: Mai 9, 2008. 
      - add --version option
      - modify usage
      - detect sudo
      - allow user to remove their own snapshot only when using sudo
      - tcsh script can be setuid but bash and sh script cannot be setuid, not sure why?
      - force bash directory

 version 1.0.3: April 17, 2008. 
      - set full path for whoami 
      - ajusting usage

 version 1.0.2: April 16, 2008. 
      - trap unknown option and only '-' as an option
      - trap -- option to treat rest as a user

 version 1.0.1: April 14, 2008. 
      - change grep for egrep so we ca use '(str1|str2)'
      - set full path
      - change usage for egrep and version

 version 1.0: April 11, 2008.
      - first working release

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No Known critical Bugs
No Known Bugs


Future feature
 - any suggestions ? Please feel free to ask.