00291nam a2200109 a 450000500170000002000150001708200230003210000350005524500330009026000400012330000180016320251203091849.0  a8120304993  a001.6424u,bD, ker  aKernighan, Brian W., Pike, Rob  aUnix programming environment  aDelhibPrentice-Hall of Indiac1984  ax, 358p, 24cm