if [ -e "/path/to/file" ]; then echo "File exists" else echo "File does not exist" fi 复制代码 在上面的示例中,-e选项用于检查文件是否存在。如果文件存在,则打印"File exists";如果文件不存在,则打印"File does not exist"。您可以根据实际情况修改文件的路径来判断其他文件是否存在。 0 赞 0 ...
[ FILE1 -nt FILE2 ] 如果 FILE1 has been changed more recently than FILE2, or 如果 FILE1 exists and FILE2 does not则为真。 [ FILE1 -ot FILE2 ] 如果 FILE1 比 FILE2 要老, 或者 FILE2 存在且 FILE1 不存在则为真。 [ FILE1 -ef FILE2 ] 如果 FILE1 和 FILE2 指向相同的设备和节...
book@book-desktop:/work/tmp/unp$ mkfifo my_file mkfifo: cannot create fifo `my_file': File exists //由于命名管道已经存在,所以此时的mkfifo命令失败 创建方法二mkfifo函数: 将上面的命名管道删除后,利用以下的语句又一次创建my_file命名管道。 int res = mkfifo("my_file", 0777); if(res == 0) p...
// 如果Socket文件已存在,则先删除 if (System.IO.File.Exists(SocketFilePath)) { System.IO.File.Delete(SocketFilePath); } // 绑定并开始监听UNIX Socket socket.Bind(new UnixDomainSocketEndPoint(SocketFilePath)); socket.Listen(1); await Task.Run(() => { while (true) { var clientSocket = ...
Open the file in read only mode. $ vim -R /etc/passwd More vim examples: How To Record and Play in Vim Editor 8. diff command examples Ignore white space while comparing. # diff -w name_list.txt name_list_new.txt 2c2,3 < John Doe --- > John M Doe > Jason Bo...
if file2 exists prompt for confirmation before overwritting it. $ cp -i file1 file2 29. mv command examples Rename file1 to file2. if file2 exists prompt for confirmation before overwritting it. $ mv -i file1 file2 Note: mv -f is just the opposite, which will overwrite file2 ...
$ vim +143 filename.txt Go to the first match of the specified $ vim +/search-term filename.txt Open the file in read only mode. $ vim -R /etc/passwd More vim examples:How To Record and Play in Vim Editor 8. diff command examples ...
IV. If an old passwordfile exists then you can overwrite it with FORCE=Y or you have to remove it from the current directory before recreating the passwordfile. 可以使用FORCE=Y选项覆盖当前密码文件,或者移走当前的密码文件后重新生成一个新的密码文件。
if(!upFile.exists()) { upFile.mkdir(); } File file = new File(upFile, k8sYamlName); //替换参数 t.process(model, new FileWriter(file)); //todo 使用yaml资源清单创建或替换资源 //TODO 从tmp下读取替换后的文件 File yaml = ResourceUtils.getFile(upFile + k8sYamlName); ...
*Test if a file exists */fd =open("/tmp/test.txt",O_CREAT|O_EXCL);printf("The file exists,so the open result is %d\n",fd); } fd参数把open和openat区分开,共有三种可能: path参数指定的是绝对路径名,在这种情况下,fd参数被忽略,openat就相当于open. ...