TY  - BOOK
AU  - Das Sumitabha. 
TI  - Unix concepts and application
SN  - 13:978-0-07-063546-3 
U1  - 005.422 
PY  - 2012///
CY  - New delhi
PB  -  Tata Mcgraw Hill, 
KW  - Engineering
ER  -