用 sed 去掉 去掉windows下的回车符
(注意^M 在linux 下写法 按^M 是回车换行符,输入方法是按住CTRL+v,松开v,按m)
sed -i 's/^M//g' df.txt
Tuesday, 25 September 2012
Monday, 12 March 2012
check if a year is a leap year.
read this codes from Linux Device Driver, think it is good :)
record it here.
/*
* return 1 if year is leap year, 0 otherwise.
*/
static int inline
leap_year(int year)
{
return !(year % 400) || ( !(year % 4) && (year % 100)) ;
}
/* Number of days in each month (not leap year). */
static const char no_of_days[] =
{ 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
record it here.
/*
* return 1 if year is leap year, 0 otherwise.
*/
static int inline
leap_year(int year)
{
return !(year % 400) || ( !(year % 4) && (year % 100)) ;
}
/* Number of days in each month (not leap year). */
static const char no_of_days[] =
{ 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
标签:
c
Monday, 27 February 2012
usermod command
usermod command
the default path of the command is /usr/sbin
add one user to one group:
here use the option '-a'
from the manul
-a, --append append the user to the supplemental GROUPS
mentioned by the -G option without removing
him/her from other groups
/usr/sbin/usermod -a -G group1 user_name
remove one user from one group, you have to move that user to another group:
/usr/sbin/usermod -G group2 user_name
the default path of the command is /usr/sbin
add one user to one group:
here use the option '-a'
from the manul
-a, --append append the user to the supplemental GROUPS
mentioned by the -G option without removing
him/her from other groups
/usr/sbin/usermod -a -G group1 user_name
remove one user from one group, you have to move that user to another group:
/usr/sbin/usermod -G group2 user_name
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