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There are two ways to use "here documents" with bash to fill stdin:
The following example shows use with the "bc" command.
a) Using a delimiter at the end of data:
$ less-than less-than eeooff bc
> k=1024
> m=k*k
> g=k*m
> g
> eeooff
1073741824
b) using the "inline" verion with three less-than symbols:
$ less-than less-than less-than "k=1024; m=k*k; g=k*m; g" bc
1073741824
One nice advantage of using the triple less-than version is that the command can easily be recalled
from command line history and re-executed.
PS: in this "description", I had to use the name "less-than" to represent the less-than symbol because the commandlinefu input text box seems to eat up the real less-than symbols. Odd.
This uses PV to monitor the progress of the MySQL import and displays it though Zenity. You could also do this
pv ~/database.sql | mysql -u root -pPASSWORD -D database_name
and get a display in the CLI that looks like this
2.19MB 0:00:06 [ 160kB/s] [> ] 5% ETA 0:01:40
My Nautalus script using this command is here
http://www.daniweb.com/forums/post1253285.html#post1253285
The lastb command presents you with the history of failed login attempts (stored in /var/log/btmp). The reference file is read/write by root only by default. This can be quite an exhaustive list with lots of bots hammering away at your machine. Sometimes it is more important to see the scale of things, or in this case the volume of failed logins tied to each source IP.
The awk statement determines if the 3rd element is an IP address, and if so increments the running count of failed login attempts associated with it. When done it prints the IP and count.
The sort statement sorts numerically (-n) by column 3 (-k 3), so you can see the most aggressive sources of login attempts. Note that the ':' character is the 2nd column, and that the -n and -k can be combined to -nk.
Please be aware that the btmp file will contain every instance of a failed login unless explicitly rolled over. It should be safe to delete/archive this file after you've processed it.
Searches all log files (including archived bzip2 files) for invalid user and PAM authentication errors, both of which are indicative of brute force attempts at logging into computer. A list of all unique IP addresses and domain names is appended to hosts.deny. The command (and grep error messages) will work on Mac OS X 10.6, small adjustments may be needed for other OSs.
This command modifies the preferences file of Firefox that is located in .mozilla/firefox/*.default/prefs.js. It edits the file with sed and the -i option. Then it searches the string "browser.startup.homepage", and the string next to it (second string). Finally, it replaces the second string with the new homepage, that is http://sliceoflinux.com in the example.
It doesn't work if you haven't set any homepage.
sed can be used deleting the last line and with -i option, there's no need to for temp files, the change is made on the actual file
trap is the bash builtin that allows you to execute commands when the current script receives a particular signal.
Uses $0 for the script name, $$ for the script PID, tee to output to STDOUT as well as a log file and ps to log other running processes.
Look for an rpm that supplies a specific file that you don't yet have installed.
extremely useful when you need something and don't know where it is.. or what its called.
note: uses grep like syntax.
You can simply run "largest", and list the top 10 files/directories in ./, or you can pass two parameters, the first being the directory, the 2nd being the limit of files to display.
Best off putting this in your bashrc or bash_profile file
