How to jump to previous page or next page in vim?
Answer:
To move to previous page or next page in vim, you can use the ctrl+b or ctrl+f combinations.
Jul 282012
Linux Ask!
Jul 232012
How to get absolute path in Python?
Answer:
To return the absolute path when you provide shortcut path such as ".", e.g.
import os
print os.path.abspath(".") # print the full path of ., depending where you execute the program
Jul 202012
How to find file by inode number
Answer:
To find a file by its inode number, you can use the argument -inum with the find command. e.g.
# find -inum 8232976
./test.txt
./hard_link.txt
Jul 172012
Create hard link in Linux
Answer:
To create a hard link in Linux, use the ln command, e.g.
# echo "test" > test.txt
# ln test.txt hard_link.txtTo show they are pointing to the same thing, we can check the inode, e.g.
# ls -i
8232976 hard_link.txt 8232976 test.txt
Jul 152012
How to recover a deleted file (but still being opened) in Linux?
Answer:
If you have a file which is deleted but is still opening in another program, it is possible to recover it.
Let do a quick experiment:
# echo "hello" > /tmp/test.txt
# less /tmp/test.txt # Open this file
Now, in another terminal, we delete it
# rm /tmp/test.txt
To recover it, we need to find the pid of the program (less in our example) which is opening this file
# ps ax | grep less
31314 pts/0 S+ 0:00 less test
Then we list the file descriptor being used by this program
# ls -l /proc/31314/fd
lr-x------ 1 joe joe 64 2012-07-05 08:56 4 -> /tmp/test (deleted)
Finally we can easily recover the content by
# cp /proc/31314/fd/4 /tmp/test.txt
