fgp@node1:~/tmp$ echo"Hello World">test.rawfgp@node1:~/tmp$truncate-s 1G test.rawfgp@node1:~/tmp$ ls -slhtotal 68K4.0K -rw-rw-r-- 1 fgp fgp 1.0G May 28 14:52 test.rawfgp@node1:~/tmp$ sed -i's/Hello/HELLO/g'test.rawfgp@node1:~/tmp$ ls -slhtotal 1.1G1.1G -rw-...
-t, --truncate-set1 first truncate SET1 to length of SET2---替换 --help display this help and exit --version output version information and exit SETs are specified as strings of characters. Most represent themselves. Interpreted sequences are: \NNN character with octal value NNN (1 to 3...
SET1 [SET2] 转换和删除字符 -c –C --complement 取字符集的补集 -d --delete 删除SET1的字符 -s --squeeze-repeats 把连续重复的字符以单独一个字符表示 -t --truncate-set1 将SET1转化为SET2 tr -d a < filename 删除文件filename标准输出中的a tr -s '\n' < filename 删除文件filename标准...
但可惜的是–sparse参数和–inplace参数不能同时使用。通常做法是第一次传输文件时,使用–sparse参数,之后如果对文件进行了修改,需要同步远程时,使用–inplace参数,它只会在原文件的基础上传输更新的块。(可以先在远程目标机器上先使用truncate命令创建一个同名的sparse文件,再使用–inplace参数传递)。 当然如果我们传...
files that reside on remote file systems. inotify is not used in this case because it would miss any updates to the file that were not initiated from the local system. any_non_remote_file() checks if the user has specified any files that don't reside on remote file systems. inotify is...
It receives events and, based on those events, runs jobs that can in turn produce more events, causing Upstart to run more jobs, and so on. systemd是目标导向的。你定义一个目标,以及它的依赖关系和你想要达到目标的时间。systemd满足依赖关系并解决目标。systemd还可以推迟启动服务,直到绝对需要时再...
*/ void * vm_private_data; /* was vm_pte (shared mem) */ unsigned long vm_truncate_count;/* truncate_count or restart_addr */ #ifndef CONFIG_MMU struct vm_region *vm_region; /* NOMMU mapping region */ #endif #ifdef CONFIG_NUMA struct mempolicy *vm_policy; /* NUMA policy for ...
This works with most ASCII log files because almost always, process log files are 100% write-only, read-never. This makes the files safe to copy and truncate in place without ever interrupting the process. In fact, the process never even knows that the file has been manipulated! It is th...
函数vmtruncate所完成的操作以及它的代码都与文件的读写关系更为密切,所以我们打算把这个函数留到文件的读写博客中再深入阅读。 最后,由于inode结构的内容改变了,所以要通过mark_inode_dirty把它挂入到所属super_block结构中的s_dirty队列中。 至此对目标文件所进行的操作都已完成,但是代表着当前进程与目标文件的...
This command produces a lot of output, because a typical system has numerous active units, but it will still be abridged because systemctl truncates any really large unit names. To see the full names of the units, use the --full option, and to see all units (not just active), use th...