How to create the date wise backup file using T-SQL script - sql-server

Question

I wrote the following script but it shows an error due to the + sign in #command argument. Could anyone suggest how I can get rid of this error?
USE msdb;
GO
--add a job
EXEC dbo.sp_add_job
#job_name = N'FullBackup';
GO
USE msdb;
GO
--add jobsteps to jobsteps
DECLARE #fileName VARCHAR(90);
DECLARE #db_name VARCHAR(20);
DECLARE #fileDate VARCHAR(20);
DECLARE #commandtxt VARCHAR(100);
SET #fileName = 'D:\SQL server\BackUp\';
--SET #db_name = 'AdventureWorks_';
SET #fileDate = CONVERT(VARCHAR(8), GETDATE(),112);
SET #fileName = #fileName + #db_name + RTRIM(#fileDate) + '.bak';
SET #commandtxt = N'''BACKUP DATABASE [AdventureWorks2012] TO DISK =N''' + #fileName + ''' WITH INIT';
EXEC sp_add_jobstep
#job_name = N'FullBackup',
#step_name = N'Weekly Full Backup',
#subsystem = N'TSQL',
#command = 'BACKUP DATABASE [AdventureWorks2012] TO DISK =N''' + #fileName + ''' WITH INIT',
#retry_attempts = 5,
#retry_interval = 5;
GO
--Create a Schedule for this job, backup, occurs once a week each friday at 11:59
EXEC sp_add_schedule
#schedule_name = N'WeeklyBackup1',
#freq_type = 8,
#freq_interval = 32,
#freq_recurrence_factor = 1,
#active_start_time = 235900;
GO
--attach the schedule to the job
EXEC sp_attach_schedule
#job_name = N'FullBackup',
#schedule_name = N'WeeklyBackup1';
GO
EXEC dbo.sp_add_jobserver
#job_name = N'FullBackup';
GO

Answer 1

Try this
SET #commandtxt = N'BACKUP DATABASE [AdventureWorks2012] TO DISK =N''' + #fileName + ''' WITH INIT'
EXEC sp_add_jobstep
#job_name = N'FullBackup',
#step_name = N'Weekly Full Backup',
#subsystem = N'TSQL',
#command = #Commandtxt,
#retry_attempts = 5,
#retry_interval = 5;
GO
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