TEE Command is beautiful

$ ls –l | tee dir.txt ## list as well as store in a file
total 141 
-rwxrwxrwx 1 mjb group 16850 Apr 12 16:13 SMALL01.DOC 
-rwxrwxrwx 1 mjb group 14881 Apr 12 20:51 SMALL02.DOC 
-rwxrwxrwx 1 mjb group 17758 Jun 13 01:29 Small03.doc 


$ cat dir.txt 
total 141 
-rwxrwxrwx 1 mjb group 16850 Apr 12 16:13 SMALL01.DOC 
-rwxrwxrwx 1 mjb group 14881 Apr 12 20:51 SMALL02.DOC 
-rwxrwxrwx 1 mjb group 17758 Jun 13 01:29 Small03.doc 


## -a switch to append to existing file
echo "Those are all the files“ | tee -a dir.txt