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How does password salt help against a rainbow table attack?
...ee what purpose the salt serves,
A rainbow table attack always needs /etc/passwd (or whatever password database is used), or else how would you compare the hashes in the rainbow table to the hashes of the actual passwords?
As for the purpose: let's say the attacker wants to build a rainbow table fo...
Allow user to set up an SSH tunnel, but nothing else
... may be tunneling, without an interactive shell, to set that shell in /etc/passwd to /usr/bin/tunnel_shell.
Just create the executable file /usr/bin/tunnel_shell with an infinite loop.
#!/bin/bash
trap '' 2 20 24
clear
echo -e "\r\n\033[32mSSH tunnel started, shell disabled by the system administr...
How to search file text for a pattern and replace it with a given value
...ile. This is catastrophic if you're doing something like writing out /etc/passwd files as part of system configuration management.
Note that in-place file editing like in the accepted answer will always truncate the file and write out the new file sequentially. There will always be a race conditio...
FTP/SFTP access to an Amazon S3 Bucket [closed]
...our security credentials in a form access-key-id:secret-access-key to /etc/passwd-s3fs
Add a bucket mounting entry to fstab:
<bucket> /mnt/<bucket> fuse.s3fs rw,nosuid,nodev,allow_other 0 0
For details, see my guide Setting up an SFTP access to Amazon S3.
Use S3 Client
Or use any...
Read user input inside a loop
...
read input
echo $input;
done
Unit test:
for line in $(cat /etc/passwd); do
read input
echo $input;
echo "[$line]"
done
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Add Keypair to existing EC2 instance
...
[ubuntu@ip-11-111-111-111 ~]$ sudo su -
[root@ip-11-111-111-111 ubuntu]# passwd john
Add “john” to sudoer’s list by:
[root@ip-11-111-111-111 ubuntu]# visudo
.. and add the following to the end of the file:
john ALL = (ALL) ALL
Alright! We have our new user created, now you need ...
How to make the 'cut' command treat same sequental delimiters as one?
... for parsing files where the separator is not whitespace (for example /etc/passwd) and that have a fixed number of fields. Two separators in a row mean an empty field, and that goes for whitespace too.
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SSH to Vagrant box in Windows?
...: 127.0.0.1
Port: 2222
When you connect(Terminal Screen):
User: vagrant
Passwd: vagrant
Before you try to connect, verify your VM using cmd.exe:
vagrant status
If it is down use:
vagrant up
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How to export and import a .sql file from command line with options? [duplicate]
... check and confirm: grant all privileges on *.* to root@"%" identified by "Passwd";
ERROR 2006 (HY000) at line 866: MySQL server has gone away
mysqldump: Got errno 32 on write
# set this values big enough on destination mysql server, like: max_allowed_packet=1024*1024*20
# use compress parameter ...
In Windows cmd, how do I prompt for user input and use the result in another command?
...ping? Like if you wanted to do a: set /p id=Enter ID:\r\n set /p pw=Enter Passwd: and didn't want the password text to show in the window, let alone, show in the "DosKey" command buffer? I've tried several different ways, and haven't been able to find a way to do this, outside of writing a little ...