lsof恢复误删文件

用 lsof 恢复 误删除文件实验:
先模拟一个进程:
[tiger@root:/home/tiger]$  echo "hello deletede" >> test.txt  
[tiger@root:/home/tiger]$  cat >> test.txt                                                                                                                                          
模拟恢复实验：
[tiger@root:/home/tiger]$  lsof | grep test.txt                                                                                                                                                       
cat       2982671 tiger    1w      REG              253,2       15     2673 /home/tiger/test.txt                                                                                                            
[tiger@root:/home/tiger]$  rm test.txt                                                                                                                                                                
rm: remove regular file `test.txt'? y                                                                                                                                                                             
[tiger@root:/home/tiger]$  lsof | grep test.txt                                                                                                                                                       
cat       2982671 tiger    1w      REG              253,2       15     2673 /home/tiger/test.txt (deleted)                                                                                                  
[tiger@root:/home/tiger]$  cd /proc/2982671/fd/1                                                                                                                                                      
-bash: cd: /proc/2982671/fd/1: Not a directory                                                                                                                                                                    
[tiger@root:/home/tiger]$  cd /proc/2982671/fd                                                                                                                                                        
[tiger@root:/proc/2982671/fd]$                                                                                                                                                                           
[tiger@root:/proc/2982671/fd]$  ll                                                                                                                                                                       
total 0                                                                                                                                                                                                           
lrwx------ 1 tiger tiger 64 Jan 27 02:12 0 -> /dev/pts/1                                                                                                                                                    
l-wx------ 1 tiger tiger 64 Jan 27 02:12 1 -> /home/tiger/test.txt (deleted)                                                                                                                             
lrwx------ 1 tiger tiger 64 Jan 27 02:12 2 -> /dev/pts/1                                                                                                                                                    
[tiger@root:/proc/2982671/fd]$  cd 1                                                                                                                                                                     
-bash: cd: 1: Not a directory                                                                                                                                                                                     
[tiger@root:/proc/2982671/fd]$  cat 1                                                                                                                                                                    
hello deletede                                                                                                                                                                                                    
[tiger@root:/proc/2982671/fd]$  cp 1 /home/tiger/test.txt                                                                                                                                             
[tiger@root:/proc/2982671/fd]$  ls -lrt | grep test.txt                                                                                                                                                  
l-wx------ 1 tiger tiger 64 Jan 27 02:12 1 -> /home/tiger/test.txt (deleted)                                                                                                                             
[tiger@root:/proc/2982671/fd]$  cat 1                                                                                                                                                                    
hello deletede                                                                                                                                                                                                    
[tiger@root:/proc/2982671/fd]$  cat 1 >  /home/tiger/test.txt                                                                                                                                         
[tiger@root:/proc/2982671/fd]$  ls -lrt | grep test.txt                                                                                                                                                  
l-wx------ 1 tiger tiger 64 Jan 27 02:12 1 -> /home/tiger/test.txt (deleted)                                                                                                                             
[tiger@root:/proc/2982671/fd]$  ll /home/tiger                                                                                                                                                        
total 32                                                                                                                                                                                                          
-rwxr-x--- 1 tiger tiger 147 Jan  4 09:45 def.py                                                                                                                                                            
-rw-r----- 1 tiger tiger  42 Jan 18 06:19 hello.txt                                                                                                                                                         
-rwxr-x--- 1 tiger tiger 142 Jan  4 03:43 if.py                                                                                                                                                             
-rwxr-x--- 1 tiger tiger 346 Jan 20 07:40 open.py                                                                                                                                                           
-rwxr-x--- 1 tiger tiger 179 Jan 20 08:00 os.py                                                                                                                                                             
-rwxr-x--- 1 tiger tiger 112 Jan 20 07:41 sort.py                                                                                                                                                           
-rw-r----- 1 tiger tiger  15 Jan 27 02:15 test.txt                                                                                                                                                          
-rwxr-x--- 1 tiger tiger 410 Jan 26 06:27 try.py                                                                                                                                                            
[tiger@root:/proc/2982671/fd]$  cat test.txt                                                                                                                                                             
cat: test.txt: No such file or directory                                                                                                                                                                          
[tiger@root:/proc/2982671/fd]$  cat test.txt                                                                                                                                                             
cat: test.txt: No such file or directory                                                                                                                                                                          
[tiger@root:/proc/2982671/fd]$  cat /home/tiger/test.txt  
hello deletede