Check These Out
I always add this to my .profile rc so I can do things like: "vim *.c" and the files are opened in tabs.
It's quite fun to invert text using "flip.pl" (ref: http://ubuntuforums.org/showthread.php?t=2078323 ).
Slightly more challenging is to flip a whole "cowsay". :-)
Imagine you've started a long-running process that involves piping data,
but you forgot to add the progress-bar option to a command.
e.g.
$ xz -dc bigdata.xz | complicated-processing-program > summary
.
This command uses lsof to see how much data xz has read from the file.
$ lsof -o0 -o -Fo FILENAME
Display offsets (-o), in decimal (-o0), in parseable form (-Fo)
This will output something like:
.
p12607
f3
o0t45187072
.
Process id (p), File Descriptor (f), Offset (o)
.
We stat the file to get its size
$ stat -c %s FILENAME
.
Then we plug the values into awk.
Split the line at the letter t: -Ft
Define a variable for the file's size: -s=$(stat...)
Only work on the offset line: /^o/
.
Note this command was tested using the Linux version of lsof.
Because it uses lsof's batch option (-F) it may be portable.
.
Thanks to @unhammer for the brilliant idea.
If you frequently need to connect to your ubersecure mainframe from various uberunsafe machines, you have to face difficult decision: (a) type the password everytime during the session (lame), (b) add local public key to mainframes authorized_keys file (unsafe), (c) as above, but remove this key at the end of the session (pain in the a55). So let's say you save The Command to tempauth file in bin directory of your mainframe's account and make it executable. Then, while you're on one of these unsafe ones, do:
$ cat $HOME/.ssh/id_rsa.pub|ssh 5z474n@mainframe.nl bin/tempauth 30
and password prompts stop the harassment for 30 minutes and you don't have to care to remove the unsafe key after that.
This command prints the Date (Not time) from 3 days ago (72 hours ago).
This works on systems without GNU date (MacOSX , Solaris, FreeBSD).
Change the -p argument for the port number. See "man nmap" for different ways to specify address ranges.
Instead, install apt-get install secure-delete and you can use:
-- srm to delete file and directory on hard disk
-- smem to delete file in RAM
-- sfill to delete "free space" on hard disk
-- sswap to delete all data from swap
sends commands specified in $commandfile to the telnet-server specified by $telnetserver.
to have newlines in $commandfile interpreted as ENTER, save the file in CR+LF (aka "Windows-Textfile") format.
if you want to save the output in a separate file, use:
$nc $telnetserver 23 < $commandfile > $resultfile
