000 00290nam a2200121Ia 4500
008 220201s9999 xx 000 0 eng d
082 _a001.6425
_bAHM
100 _aAhmad, M.I.
245 0 _aUnix operating system
260 _aNew Delhi
_bDhanpat Rai
300 _a13.19
942 _2ddc
_cREF
999 _c63910
_d63910