# My huge file 297 points>I have a very big file for you. I hid a present inside.>Classic tools wont be useful here.>Connect with ssh [email protected] -p 9000. Password : big.>Creator : Nofix
SSH into it:```bashbig@ee6e73167aa0:~$ls -lhtotal 256K-rw-r--r-- 1 root root 31G May 11 23:13 my_huge_filebig@ee6e73167aa0:~$```Notice the `my_huge_file` is **31G!!!**
I tried to use `tr` `cat | grep` but it takes to much time so it been killed
Then do some research on `grep all except null` found:[Remove blank lines with grep](https://stackoverflow.com/questions/3432555/remove-blank-lines-with-grep)
Then i try:```bashgrep -v -e '^$' my_huge_fileBinary file my_huge_file matches```
Then i do more research found this link:[Grep 'binary file matches'](https://stackoverflow.com/questions/23512852/grep-binary-file-matches-how-to-get-normal-grep-output)
Need add `-a` option
But i tried, it been killed```bashgrep -av -e '^$' my_huge_file Killed```
Then i look at the man page of `grep`, notice an option:```-z, --null-data
Treat input and output data as sequences of lines, each terminated by a zero byte (the ASCII NUL  character)  insteadof  a newline.  Like the -Z or --null option, this option can be used with commands like sort -z to process arbitraryfile names.
```
Then I quickly test it out:```grep -avz -e '^$' my_huge_file ?shkCTF{sp4rs3_f1l3s_4r3_c001_6cf61f47f6273dfa225ee3366eacb8eb}```
Yes!! We get the damn flag!!
## Flag```shkCTF{sp4rs3_f1l3s_4r3_c001_6cf61f47f6273dfa225ee3366eacb8eb}```
## Other solutionsAfter the CTF ends, I notice this is a sparse file (Means physically the file is not 31G)
[Use tail command](https://github.com/TheLeagueOfSociallyDistancedGentlemen/SharkyCTF2020/blob/master/Misc.md)
[Sparse file](https://github.com/LibWTF/ctf_writeups/blob/master/SharkyCTF-2020/MyHugeFile.md)