#include <stdio.h> #include <stdbool.h> #include <sys/stat.h> bool file_exists(const char *filename) { struct stat buffer; return (stat(filename, &buffer) == 0); } int main() { if (file_exists("example.txt")) {
#include <QFile> #include <QDebug> void deleteFile(const QString &filePath) { QFile file(filePath); if (file.exists()) { if (file.remove()) { qDebug() << "文件删除成功:" << filePath; } else { qDebug() << "文件删除失败:" << filePath; } } else { qDebug() << "文件...
“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...
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...
if os.path.exists(src_path): if os.path.isdir(src_path): shutil.move(src_path, dest_path) elif os.path.isfile(src_path): shutil.copy(src_path, dest_path) os.remove(src_path) print(“Move successfully!”) else: print(“Source path does not exist!”) ...
if (request->fl_file != fl->fl_file) 865 continue; 866 if (request->fl_type == fl->fl_type) 867 goto out; 868 found = 1; 869 locks_delete_lock(before, &dispose); 870 break; 871 } 872 873 if (request->fl_type == F_UNLCK) { 874 if ((request->fl_flags & FL_EXISTS)...
Flush the TLB if a writable entry * potentially exists to avoid CPU writes after IO * starts and then write it out here. */ try_to_unmap_flush_dirty(); // 运行到这里,说明的确是在回收流程中出现的脏页,尝试将脏页换出 // 这里也只是将页写入到块中,并不是真正的写入到文件系统 // page...
Rocky linux 也更新到 9 了,准备试试可以用了不,还是继续用 xfce4 界面。官方有提供 xfce4 版的 Rocky linux,直接下来装就好:各个版本下载地址。题外话,...
-c –Do not create the file if it already exists. This avoids accidentally overwriting existing files. -m –Instead of creating a new file, update the timestamp on an existing file. This can be used to change the modified time.For example:touch /home/user/newfile.txt...
which means if the absolute path/$fis opened, then first check if/$fexists, and if it doesn't, then check ifo/$fexists, in which case open that instead. Blink uses this convention to open shared object tests. It favors the system version if it exists, but also downloadsld-musl-x86_...