SqlCmd command execution stops - sql

Question

Iam new to sqlcmd and i'm trying to execute this sql cmd code:
:Connect SERVERNAME
!!if exist $(FullBackup) del $(FullBackup)
GO
!!if exist $(TransactionLog) del $(TransactionLog)
GO
I am passing variables $(FullBackup) and $(TransactionLog) through a powershell script:
& $app -i $syncFileLocal -E -b -v FullBackup=("""$fullbackup""") TransactionLog=("""$transactionLog""");
where syncFileLocal contains the above sqlcmd command.
Somehow the execution stops after the second :Connect PROD-SQLMASTER
UPDATE:
When i use harcorded values for $(FullBackup) and $(TransactionLog)
the script seems to work. Is there anyway i could do it by passing variables through powershell?

Answer 1

Instead of:
FullBackup=("""$fullbackup""") TransactionLog=("""$transactionLog""")
try:
FullBackup="""$fullbackup""" TransactionLog="""$transactionLog"""
If you use (), the grouping operator, its output is passed as a separate argument, which is not what you want.
Do note, however, that even the solution above relies on PowerShell's fundamentally broken argument-passing to external programs, as of v7.0 - see this answer.
If sqlcmd is implemented properly (I don't know if it is), the right way to pass the arguments is:
FullBackup=$fullbackup TransactionLog=$transactionLog
That way, you would rely on PowerShell's on-demand, behind-the-scenes re-quoting of arguments, where if $fullbackup or $translactionLog contained spaces, the arguments would be passed as, for instance, "FullBackup=c:\path\to\backup 1" and "TransactionLog=c:\path\to\log 1"

Answer 2

I found a solution. I recommend using this with appropriate validations
:Connect $(ServerMaster)
DECLARE #resultBkp INT
EXEC master.dbo.xp_fileexist N'$(FullBackup)', #resultBkp OUTPUT
IF (#resultBkp = 1)
BEGIN
DECLARE #resultDeleteBkp INT
EXECUTE master.sys.xp_cmdshell '$(FullBackup)'
EXEC master.dbo.xp_fileexist N'$(FullBackup)', #resultDeleteBkp OUTPUT
IF (#resultDeleteBkp = 0)
BEGIN
PRINT 'Backup Deleted'
END
ELSE
BEGIN
SELECT ERROR_NUMBER(), ERROR_MESSAGE();
RETURN;
END
END
ELSE
BEGIN
PRINT 'Backup file not found'
END
I used the master.dbo.xp_fileexist to check whether the file exists and then used
master.sys.xp_cmdshell command to delete the file.
To enable master.sys.xp_cmdshell for the database server please use this solution:
Enable 'xp_cmdshell' SQL Server
I have tested it and it works fine when i pass the arguments via powershell.