powershell - An empty pipe element is not allowed, Get-WinEvent -FilterHashtable -

i'm new powershell (v5) found on web way list non empty logs e.g. in last 30 minutes. however, cannot redirect output file. suggestions gratefully received.

$time1 = new-timespan -minutes 30 $logs = get-winevent -listlog * | where-object {$_.recordcount} |  select-object -expandproperty logname get-winevent -filterhashtable @{logname=$logs; level=1,2,3; starttime=(get-date)-$time1} | out-file c:\temp\test1.txt 

there 2 ways make powershell continuation of pipeline on next line:

• place | @ end of line.

  • more generally: statement invariably needs more tokens syntactically valid causes powershell keep parsing on next line.

• use explicit line continuation placing ` (powershell's escape character) @ very end of line (not whitespace allowed after).

  • note: unlike posix-like shells \, powershell retains newline follows `. between arguments difference doesn't matter, if use `<newline> in middle of argument, newline becomes part of argument.

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what tried:

powershell reads following two statements:

get-winevent -filterhashtable @{logname=$logs; level=1,2,3; starttime=(get-date)-$time1} | out-file c:\temp\test1.txt 

the get-winevent line syntactically complete itself, powershell considers own statement.

thus, powershell, next statement starts with |, prompts error message saw (there must command or expression before statement's first |).

^{that said, changing powershell's parsing | first (non-whitespace) character on next line has been suggested.}