i printed the Tsql fron @cmddtring variable which is actually getting executed at last, kindly find the printed or actual executed text of @cmdstring below, i have not added any double quote just pasting same what i am getting.

""powershell.exe" "& Get-ChildItem 'D:\Dtest\' | where {$_.lastWriteTime -lt ((Get-Date).AddHours(-6))

-and ($_.Extension -match 'txt') } | Remove-Item -force "

below is the error :

Missing closing '}' in statement block.

At line:1 char:83

+ & Get-ChildItem 'D:\Dtest\' | where {$_.lastWriteTime -lt ((Get-Date).AddHour

s(-6)) <<<<

NULL