I have a huge tab delimited file in this format: 

```
AN_NFE=6958     AC_SAS=1        AN_SAS=7704     AF=1.022e-05    
AC_OTH=0        AN_OTH=118      AC_SAS=6        AN_SAS=7360     
AN_NFE=2754     AC_OTH=0        AN_OTH=116      AC_SAS=14        

```

Each row contains a value for "AC\_SAS" but in different columns. I want to grep all records of "AC\_SAS" with its value from each row, and output as one column, like this: 

```
AC_SAS=1  
AC_SAS=6  
AC_SAS=14  

```