摘要： shell is a program that takes keyword commdands and passes them tothe operating system to carry out.when you use GUI,KDE uses konsole and GNOME usesgnome-terminal. $ is called a shell prompt and it will appear whenever the shell is ready to accept input.# means you logged in as the root us... 阅读全文

摘要： typedef struct { int counter;} atomic_t;#ifdef CONFIG_64BITtypedef struct { long counter;} atomic64_t;#endiflinux 内核使用特殊的数据类型atomic_t来代替直接使用C语言的整型，是出自以下几个原因：（1）关于atomic_t的函数只接受atomic_t类型（2）使用atomic_t类型可以避免编译器的优化，原子操作对于使用正确的内存地址很重视。（3）可以避免CPU的体系结构的问题这里就有个问题，为什么使用结构体就可以避免原因（2），编译器没有优化之，g... 阅读全文

摘要： 用法： python test.py /home/lx/c/test#test how much lines in a directory.import os,sysdef cout( current_doc ): os.chdir( current_doc ) doc_list = os.listdir( current_doc ) for i in doc_list: if os.path.isfile( i ): os.system( 'wc -l ' +... 阅读全文

摘要： #include <locale.h>#include <stdlib.h>#include <stdio.h>intmain( void ){ printf( "%s\n", setlocale( LC_ALL, "" ) ); exit(0);} 阅读全文

摘要： in_cksum(addr, len)u_short *addr;int len;{ register int nleft = len; register u_short *w = addr; register u_short answer; register int sum = 0; /* * Our algorithm is simple, using a 32 bit accumulator (sum), * we add sequential 16 bit words to it,... 阅读全文

摘要： #author=lx#date=2011-12-27import osimport sysclass node: "store the information of a node in bnt" def __init__( self, nodename=None, cptnum=2, pnum=0, cnum=0, parename=None, childname=None ): self.node_name = nodename self.cpt_num = cptnum s... 阅读全文

摘要： #! /bin/bashLX=100for i in 1 2 3do c=$(echo "scale=2;$i/$LX"|bc) echo -n "0$c ";doneecho; 阅读全文

摘要： #include <stdio.h>#include <stdlib.h>typedef unsigned char *byte_pointer;void show_bytes( byte_pointer start, int len ){ int i; for ( i = 0; i < len; i++ ) { printf( "%.2x", start[i] ); } printf( "\n" );}void show_int( int x ){ show_bytes( (by... 阅读全文

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