Linux C语言 检测文件是否存在 头文件unistd.h if(access(file_name, F_OK ) != -1) {//file exists}else{//file doesn't exist} You can also useR_OK,W_OK, andX_OKin place ofF_OKto check for read permission, write permission, and execute permission (respectively) rather than existence, ...
Linux C语言 检测文件是否存在 头文件unistd.h if(access(file_name, F_OK ) != -1) {//file exists}else{//file doesn't exist} You can also useR_OK,W_OK, andX_OKin place ofF_OKto check for read permission, write permission, and execute permission (respectively) rather than existence, ...
if (access(file_name, F_OK) != -1):调用access函数,传入文件名和检查选项F_OK。如果文件存在,access函数返回0(不等于-1),否则返回-1。 根据access函数的返回值,打印相应的消息。 4. 给出编译和运行代码的方法 编译代码:在终端中,使用gcc编译器编译代码。例如,如果代码保存在check_file.c文件中,可以使用...
下面给出一个简单的示例代码来演示如何使用`access()`函数判断文件是否存在: ```c #include #include int main() { const char* file_path = "test.txt"; // 判断文件是否存在 if (access(file_path, F_OK) != -1) { printf("File %s exists.\n", file_path); } else { printf("File %s do...
```c #include #include #include int main() { struct stat buf; if (stat("/path/to/file.txt", &buf) == 0) { printf("File exists\n"); } else { printf("File does not exist\n"); } return 0; } ``` 无论是使用`access`函数还是`stat`函数,都可以帮助我们判断文件是否存在。在实际...
遇到一个需求,执行shell脚本时需要用root来执行,所以我们需要在脚本执行之前判读是否是root用户 方法一: $UID的值,对于root是0,而其它用户的$UID值不是0,但是这种方式在阅读...shell脚本时不明显 方法二: 判读whoami的值,如下List-1,exit的值只能是0~255之间的,只有0表示成功,其它表示失败 List-1 if [ `who...
You might be tempted to experiment with a friendlier editor when you first start out, such as Pico or one of the myriad GUI editors out there, but if you tend to make a habit out of the first thing that you use, you don’t want to go down this route. ...
ext="${filename##*.}" if [[ "$ext" == "$filename" ]]; then echo "Extension absent" exit 1; fi # Check if there is a double extension base="${filename%.*}" ext2="${base##*.}" if [[ "$ext2" == "tar" ]]; then ...
# wget-url-check.shHTTP/1.1200OKGoogle.com is up 如果你想看多个网站的状态,使用下面的 shell 脚本: 代码语言:javascript 复制 # vi curl-url-check-1.sh #!/bin/bashforsiteinwww.google.com google.co.in www.xyzzz.comdoifwget--spider-S"$site"2>&1|grep-w"200\|301";then echo"$site is...
HTTP_ENDPOINT=$(az storage account show \ --resource-group $RESOURCE_GROUP_NAME \ --name $STORAGE_ACCOUNT_NAME \ --query "primaryEndpoints.file" --output tsv | tr -d '"') SMB_PATH=$(echo $HTTP_ENDPOINT | cut -c7-${#HTTP_ENDPOINT})$FILE_SHARE_NAME if [ -z "$(grep $SMB_PATH...