符号链接可以建立对付文件和目录的链接。符号链接可以跨文件系统，即可以跨磁盘分区。符号链接的文件类型位是l，链接文件具有新的i节点。
硬链接不可以跨文件系统。它只能建立对文件的链接，硬链接的文件类型位是-，且硬链接文件的i节点同被链接文件的i节点相同。
[hadoop@localhost dzztest]$ lltotal 36-rw-r--r-- 2 hadoop hadoop 345 Sep 22 20:31 1111-rw-rw-r-- 1 hadoop hadoop 293 Sep 21 23:01 44-rwxrwxrwx 1 hadoop hadoop 109 Sep 9 20:10 a.sh-rwxrwxrwx 1 hadoop hadoop 128 Sep 10 03:03 b.sh-rwxrwxrwx 1 hadoop hadoop 204 Sep 10 03:24 c.shdrwxrwxr-x 2 hadoop hadoop 51 Sep 22 23:54 d11drwxrwxr-x 2 hadoop hadoop 52 Sep 22 23:55 d12drwxrwxr-x 2 hadoop hadoop 72 Sep 22 20:15 d3drwxrwxr-x 9 hadoop hadoop 4096 Sep 17 22:49 d4drwxrwxr-x 5 hadoop hadoop 73 Sep 22 01:00 d5-rw-r--r-- 2 hadoop hadoop 345 Sep 22 20:31 ln1111lrwxrwxrwx 1 hadoop hadoop 4 Sep 24 19:02 lns1111 -> 1111lrwxrwxrwx 1 hadoop hadoop 2 Sep 24 19:00 lns_d4 -> d4
[hadoop@localhost dzztest]$ stat 1111File: ?111?Size: 345 Blocks: 8 IO Block: 4096 regular fileDevice: 803h/2051d Inode: 1009801 Links: 2Access: (0644/-rw-r--r--) Uid: ( 1002/ hadoop) Gid: ( 1002/ hadoop)Access: 2022-09-22 20:31:07.528855297 -0700Modify: 2022-09-22 20:31:04.529855395 -0700Change: 2022-09-24 19:01:57.475032278 -0700Birth: -
[hadoop@localhost dzztest]$ stat ln1111 #文件1111的硬链接File: 鈒n1111?Size: 345 Blocks: 8 IO Block: 4096 regular fileDevice: 803h/2051d Inode: 1009801 Links: 2Access: (0644/-rw-r--r--) Uid: ( 1002/ hadoop) Gid: ( 1002/ hadoop)Access: 2022-09-22 20:31:07.528855297 -0700Modify: 2022-09-22 20:31:04.529855395 -0700Change: 2022-09-24 19:01:57.475032278 -0700Birth: -
[hadoop@localhost dzztest]$ stat lns1111 #文件1111的符号链接File: 鈒ns1111?-> ?111?Size: 4 Blocks: 0 IO Block: 4096 symbolic linkDevice: 803h/2051d Inode: 12499792 Links: 1Access: (0777/lrwxrwxrwx) Uid: ( 1002/ hadoop) Gid: ( 1002/ hadoop)Access: 2022-09-24 19:02:50.143155032 -0700Modify: 2022-09-24 19:02:50.129155032 -0700Change: 2022-09-24 19:02:50.129155032 -0700Birth: -
[hadoop@localhost dzztest]$ stat d4File: 鈊4?Size: 4096 Blocks: 8 IO Block: 4096 directoryDevice: 803h/2051d Inode: 36885857 Links: 9Access: (0775/drwxrwxr-x) Uid: ( 1002/ hadoop) Gid: ( 1002/ hadoop)Access: 2022-09-24 18:50:38.705990959 -0700Modify: 2022-09-17 22:49:05.521926065 -0700Change: 2022-09-17 22:49:05.521926065 -0700Birth: -
[hadoop@localhost dzztest]$ stat lns_d4/#目录d4的符号链接File: 鈒ns_d4/?Size: 4096 Blocks: 8 IO Block: 4096 directoryDevice: 803h/2051d Inode: 36885857 Links: 9Access: (0775/drwxrwxr-x) Uid: ( 1002/ hadoop) Gid: ( 1002/ hadoop)Access: 2022-09-24 18:50:38.705990959 -0700Modify: 2022-09-17 22:49:05.521926065 -0700Change: 2022-09-17 22:49:05.521926065 -0700Birth: -
总结：文件的硬链接和原文件具有相同的i节点，符号链接具有新的i节点
目录的符号链接和原目录具有相同的i节点
2022-9-25
