# wget-S--spider https://www.magesh.co.in Spider mode enabled.Checkifremote file exists.--2019-11-1501:22:00--https://www.magesh.co.in/LoadedCAcertificate'/etc/ssl/certs/ca-certificates.crt'Resolving www.magesh.
(StandardCharsets.UTF_8); // 将字节序列转换为字符串 String encodedFilePath = new String(filePathBytes, StandardCharsets.ISO_8859_1); // 创建File对象并检查文件是否存在 File file = new File(encodedFilePath); if (file.exists()) { System.out.println("文件存在"); } else...
You don’t really need to understand the details of how to use run-parts; in fact, most people don’t know that run-parts even exists. The main things to remember are that it shows up in scripts from time to time and that it exists solely to run the programs in a given directory....
写法2:我们创建一个用户,将该用户在/etc/passwd里面的信息删除,当看到这里的时候我们似乎看出了点特点,这就是嵌套if语句的特点:之前学到如果if语句行的命令的退出状态为非0,所有的命令都会被跳过,但是会输出else和elif后面的语句,这就相当于是否则判断语句;但if语句行如果为0时,则后面的语句也不会再执行(如第一...
“mkdir”(Make directory)命令在命名路径下创建新的目录。然而如果目录已经存在了,那么它就会返回一个错误信息"不能创建文件夹,文件夹已经存在了"("cannot create folder, folder already exists") root@raspberrypi:/opt/labpark# mkdir raspbox 注意:目录只能在用户拥有写权限的目录下才能创建。mkdir:不能创建目录...
例如,带外部参数check运行此脚本,输出如下: [root@node4 ~]# bash update-kube-cert-master/update-kubeadm-cert.sh checkCERTIFICATE EXPIRES/etc/kubernetes/controller-manager.config Dec 5 13:22:20 2032 GMT/etc/kubernetes/scheduler.config Dec 5 13:22:20 2032 GMT/etc/kubernetes/admin.config Dec 5 ...
*/ if (free_pages <= min + z->lowmem_reserve[classzone_idx]) return false; /* If this is an order-0 request then the watermark is fine */ if (!order) return true; /* For a high-order request, check at least one suitable page is free */ for (o = order; o < MAX_ORDER;...
The shell creates file if it does not already exist. If file exists, the shell erases (clobbers) the original file first. (Some shells have parameters that prevent clobbering. For example, enter set -C to avoid clobbering in bash.) 如果文件不存在,shell会创建该文件。
if ! which jstack &> /dev/null; then[ -z "$JAVA_HOME" ] && {redEcho "Error: jstack not found on PATH!"exit 1}! [ -f "$JAVA_HOME/bin/jstack" ] && {redEcho "Error: jstack not found on PATH and $JAVA_HOME/bin/jstack file does NOT exists!"exit 1}! [ -x "$JAVA_HOME/...
ifconfig --help:查看网卡信息 man命令(命令说明书) man shutdown 注意:man shutdown打开命令说明书之后,使用按键q退出 二、目录操作命令 2.1 目录切换 cd 命令:cd 目录 cd / 切换到根目录 cd /usr 切换到根目录下的usr目录 cd ../ 切换到上一级目录 或者 cd .. ...