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more /etc/httpd/
vi hello
ls
date
whoami
pwd
date;whoami;pwd
ÔÚhelloÀïдÉÏ
#/bin/bash
#this script is display current user,time and path
#it is display current time
echo "current time is"
date
#it is display current user
echo "current user is"
whoami
#it is display current path
echo "current path is"
pwd
Ö´ÐÐbash hello
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ls -l
-rwxr-xr--  Root IT    abctxt  
Root ×÷ΪËùÓÐÕß  ¿´Ç°ÈýÏî rwx
Ö´ÐÐchmod u+x hello
ls -l hello
IT   ×÷ΪËùÓÐ×é  ¿´ÖмäÈýÏî r-x
     ÆäËûËùÓÐ×é  ¿´ºóÈýÏî   r--
³£¼ûµÄ»·¾³±äÁ¿
HOME Óû§Ö÷Ŀ¼
PATH ÃüÁîËÑË÷·¾¶
PS1  ÃüÁîÌáʾ·ûºÅ
PWD  Óû§µ±Ç°¹¤×÷·¾¶
SHELL Óû§shellÀàÐÍ
TERM  ÖÕ¶ËÀàÐÍ
LANG  ÓïÑÔ»·¾³
x=abc
echo x
echo $x
x=asdfsaf
echo $x
echo $SHELL
echo $PATH
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PATH=$PATH:/root
echo $hello


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#include <fcntl.h>
int main(void)
{
    typedef union un{
        short s;
        char c[sizeof(short)];
    }un;
    un myun;
    myun.s = 0x0102;
  ......

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