我已经有目的地删除了结构的分配,并想了解瓦兰如何计算内存泄漏。
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
struct Person{
char *name;
int age;
int height;
int weight;
};
struct Person *Person_create(char *name, int age, int height, int weight){
struc
我正在学习shell编程的基础知识,使用了一本叫做“开始Linux编程”(第4版)的书。我对这个脚本和一个until-clause感到困惑:
#!/bin/bash
until who | grep "$1" > /dev/null
do
sleep 60
done
# Now ring the bell and announce the unexpected user.
echo -e '\a'
echo "***** $1 has just logged in *****"
exit 0
我的问题是who | grep &
我编写了以下bash脚本
#!/bin/bash
serverlist=server_list.txt
for server in `cat $serverlist`
do
out="hostnamectl | egrep 'Kernel|Server|hostname';who -b"
ssh -q $server $out
我得到了下面的输出~
Static hostname: mshost25
Operating System: Red Hat Enterprise Linux Server 7.9 (Maipo)
Kernel: Linux 3
当运行我的tcl脚本的一部分时,我想警告某些打开终端的用户正在发生的事情。同时让他们知道消息是从哪个终端发送的。到目前为止,我有:
set who [exec who]
set user [lindex $who 0]
set who [split $who "\n"]
for { set i 0 } { $i < [llength $who] } { incr i } {
set current [lindex $who $i]
exec write $user [lindex $current 1]
# I would now like to
据我所知,Linus拥有Linux的版权。
在查看内核源代码时,我发现几乎每个文件都有自己的版权所有者。例如,Linux内核中的文件module.c包含:
Copyright (C) 2002 Richard Henderson Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty
根目录中的复制文件包含:
NOTE! This copyright does *not* cover user programs that use kernel
services by normal system calls - this is merely
我正在使用execl函数从C运行Linux进程,例如:
int cmd_quem() {
int result;
result = fork();
if(result < 0) {
exit(-1);
}
if (result == 0) {
execl("/usr/bin/who", "who", NULL);
sleep(4); //checking if father is being polite
exit(1);
}
else {
// father's t
我有一个带有两个NIC的Linux虚拟服务器。
eth0 <IP1>
eth1 <IP2>
arp_filter被打开,rp_filter被设置为2(松散模式)。
策略路由配置如下:
table T1
default via <GW> dev eth0 src <IP1>
127.0.0.0/8 dev lo
<LAN> dev eth0 src <IP1>
table T2
default via <GW> dev eth1 src <IP2>
127.0.0.0/8 dev lo
<LA
我正在尝试创建简单的聊天应用程序,但我无法获得换行文本的一部分。
<aiml version="1.0">
<!-- basic_chat.aiml -->
<category>
<pattern>WHO INVENTED LINUX</pattern>
<template>
Linus Torvalds, along with many open source developers, and the Free Software Foundation, GNU invented Linux.<
unix haters handbook说:
/etc/getty, which asks for your username, and /bin/login, which asks for your pass-
word, are no different from any other program. They are just programs.
They happen to be programs that ask you for highly confidential and sensi-
tive information to verify that you are who you
我从我的教授那里收到了这个linux脚本,我试着理解它能做什么,我想我知道它的大部分功能。然而,有一部分让我感到困惑。junk在这一行中做了什么:
who | while read user junk
其目的是什么?我试过搜索它,但除了引用垃圾字符之外,我似乎找不到它,从我所能看出的情况来看,这是另一回事。整个剧本是:
#!/bin/bash
#Run a while loop using input of user command
who | while read user junk
do
#Get users real name from /etc/passwd file
re