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PowerShell Oneliner Contest 2016 - working solutions
$oneliner = {([char[]](71..89)|?{!(gdr $_)2>0}|sort{[guid]::newguid()})[0]+':'}
#Posted by Sam Seitz to Happy SysAdm at October 25, 2016 at 8:02 AM
$oneliner = {([char[]](71..89)|?{!(gdr($_)2>0)}|sort{[guid]::newguid()})[0]+":"}
#Posted by Rick Humes to Happy SysAdm at November 3, 2016 at 11:01 AM
$oneliner = {((71..89|%{"$([char]$_):"|?{-not(gi $_ -EA Ig)}})|sort{[guid]::newguid()})[0]}
#Posted by Marco Schmid to Happy SysAdm at October 25, 2016 at 4:55 AM
$oneliner = {([char[]](71..89)|?{$_-notin(gdr -P "f*").Name}|sort{[guid]::NewGuid()})[0]+':'}
#Posted by cruz3r to Happy SysAdm at October 26, 2016 at 2:12 PM
$oneliner = {($l=[char[]](71..89)|?{$_-notin(gdr|% N*)})[[random]::new().Next($l.count)]+":"}
#Posted by ????? to Happy SysAdm at October 28, 2016 at 4:18 PM
$oneliner = {[char[]](71..89)|%{$_+':'}|?{(!(ls($_)-EA 0))}|sort{[guid]::NewGuid()}|select -F 1}
#Posted by Anders Aspnäs to Happy SysAdm at November 1, 2016 at 1:09 AM
$oneliner = {,([char[]](71..89)|?{$_-NotIn(gdr).Name})|%{$_[[Random]::new().Next(0,$_.count)]+':'}}
#Posted by Christophe K. to Happy SysAdm at October 29, 2016 at 6:08 AM
$oneliner = {,((ls -Pa Function:[a-z]: -N) -match "['G-Y']")|%{$_[[Random]::new().Next(0,$_.count)]}}
#Posted by Micky Balladelli to Happy SysAdm at October 24, 2016 at 2:05 PM
$oneliner = {[char[]](71..89)|sort{[guid]::NewGuid()}|%{if(!(ls($_+':')-EA Ignore)){$_+':'}}|select -F 1}
#Posted by Anders Aspnäs to Happy SysAdm at October 27, 2016 at 4:35 AM
$oneliner = {[char](,(71..89|?{!(gi "$([char]$_):" -ea Si) })|%{$_[[Random]::new().Next($_.count)]})+':'}
#Posted by Micky Balladelli to Happy SysAdm at October 28, 2016 at 12:55 PM
$oneliner = {do{$a="$([char]([random]::new().Next(71,90))):"}while(gwmi win32_logicaldisk|? deviceid -eq $a)$a}
#Posted by Anthony to Happy SysAdm at November 3, 2016 at 2:45 PM
$oneliner = {do{$a="$([char]([random]::new().Next(71,90))):"}while(gwmi win32_logicaldisk -F "deviceid='$a'")$a}
#Posted by Anthony to Happy SysAdm at November 3, 2016 at 2:36 PM
$oneliner = {begin{$x=71..89|?{!(ls -ea 0 "$([char]$_):")}}end{"$([char]$x[[random]::new().Next(0,$x.count)]):"}}
#Posted by Olof Blomqvist to Happy SysAdm at October 26, 2016 at 1:08 PM
$oneliner = {([char[]](71..89)|?{!(gdr $_ -ea 0)})[([random]::new()).next($(([char[]](71..89)|?{!(gdr $_ -ea 0)})).count)]+":"}
#Posted by Ben Himsel to Happy SysAdm at October 25, 2016 at 1:34 PM
$oneliner = {(ls function:[g-y]:|%{$_|select -ov x|%{try{sl $x.name -ea st}catch{write @{[guid]::NewGuid()=$x.name}}}}|sort Keys)[0].values}
#Posted by Sam Hays to Happy SysAdm at October 31, 2016 at 4:25 PM
$oneliner = {71..89|%{if(!(ls "$([char]$_):" -ea 4)){@{([char]$_+":")=[Guid]::NewGuid().GetHashCode()}.GetEnumerator()}}|sort value|select -exp name -f 1}
#Posted by mario arizzi to Happy SysAdm at October 24, 2016 at 10:13 AM
$oneliner = {(71..89|%{[char]$_+":"}|%{if($_-NotIn(gwmi win32_logicaldisk).DeviceID){$_}})[[System.Random]::new().Next(0,(71..89|%{[char]$_+":"}|%{if($_-NotIn(gwmi win32_logicaldisk).DeviceID){$_}}).length)]}
#Posted by Nexxicon to Happy SysAdm at October 24, 2016 at 12:57 PM
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