Simple Bash Script to automate restore backup of controlfile.

Came up with this very simple script to automate the restore of control file from given backup.
This was to answer a question posted on OTN,

https://community.oracle.com/message/13668456#13668456

 [oracle@prima ~]$ cat cnt_rst.sh  
 export ORACLE_HOME=/orahome/product/11.2.0/dbhome_1  
 export ORACLE_SID=DG1  
 bdate=20151214  
 rman target / cmdfile='to_os.scr' log='os_file.txt'  
 #bpc=`cat os_file.txt | grep -i $bdate | grep -i ncnn | cut -d '/' -f 2-` - to restore from piece  
 bpc=`cat os_file.txt | grep -i 20151214 | grep -i tag: | awk '{print $NF}'`  
 echo "run {" >> rst_cnt.scr  
 #echo "restore controlfile to '/home/oracle/cnt_$bdate.cnt' from '/$bpc';" >> rst_cnt.scr - to restore from piece  
 echo "restore controlfile to '/home/oracle/cnt_$bdate.cnt' from tag $bpc;" >> rst_cnt.scr  
 echo "}" >> rst_cnt.scr  
 rman target / cmdfile='rst_cnt.scr' log='rst_cnt.log'  
 rm -rf rst_cnt.scr os_file.txt  
 [oracle@prima ~]$ cat to_os.scr  
 list backup of controlfile;  
 [oracle@prima ~]$   

Can pass the backup date (bdate), or any other parameter in order to isolate a particular backup piece from bash using above script.