Made changes to a file using vi editor and saved those changes
now realised that the changes are not required
How can I get the previous version of the file.i.e the one which was there on which I had made changes (3 Replies)
hello all im a newbie in the linux world ..i have just started creating basic scripts in linux ..i am using rhel 5 ..the thing is i wanted to create a find script where i could find the last modified file and directory in the directory given as input by the user and storing the output in a file so... (6 Replies)
Hello,
I got this script that read directories, create a zip and put logfile into the zip.
dir=/iscsi/webserver231/; for subdir in "$dir"/*/; do find "$subdir" -type f -name 'ex??????.log' -exec bash -c 'for f; do f=${f##*/ex}; echo "${f%??.log}"; done' - {} + | sort -u | while read date;... (1 Reply)
Hi,
I want to modify a filename in AIX by attaching the last modified timestamp. I want the timestamp completely in numerical format (eg:200905081210. yr-2009, mnth - 05, date -08, hr - 12, mins - 10).
For example if the filename is a.log and it was modified on April 6th 2008 at 21.00. I... (16 Replies)
Forgive me if this is a trivial question, but I haven't been able to find the answer to this.
Basically I've got a list of files in a particular directory that have the general form t_*.dat. (I have other files in the same directory as well).
Essentially what I want to do is obtain the name... (1 Reply)
Hi all,
We use cron "/usr/rdl/sc/cccron" to execute our jobs.
But sometimes it is being changed. but we are not sure when it is changed.
how could we find when cron is modified.
i checked cron by giving ls -l . but it is showing 2009 year.
ls -l /usr/rdl/sc/cccron
-r-xr-xr-x 1... (0 Replies)
Hi all,
We use cron "/usr/rdl/sc/cccron" to execute our jobs.
But sometimes it is being changed. but we are not sure when it is changed.
how could we find when cron is modified.
i checked cron by giving ls -l . but it is showing 2009 year.
ls -l /usr/rdl/sc/cccron
-r-xr-xr-x 1... (0 Replies)
Hi all,
We use cron "/usr/rdl/sc/cccron" to execute our jobs.
But sometimes it is being changed. but we are not sure when it is changed.
how could we find when cron is modified.
i checked cron by giving ls -l . but it is showing 2009 year.
ls -l /usr/rdl/sc/cccron
-r-xr-xr-x 1... (2 Replies)
Hello,
I am fairly new to shell scripting. I see a lot of examples out there of how to find if a file has been modified within a certain period of time. What I'm looking for help with is a script that will run and I'm thinking check for the last 24 hours but if not just check at runtime to see... (6 Replies)
Hello gurus,
I am making what I think is a simple db2 call from within a shell script but I am having difficulty producing the desired
report when I run the script shown below from a shell script in cron. For example, my script and the crontab file setup
is shown below:
#!/bin/ksh
db2... (3 Replies)
Discussion started by: okonita
3 Replies
LEARN ABOUT CENTOS
filter::decrypt
decrypt(3) User Contributed Perl Documentation decrypt(3)NAME
Filter::decrypt - template for a decrypt source filter
SYNOPSIS
use Filter::decrypt ;
DESCRIPTION
This is a sample decrypting source filter.
Although this is a fully functional source filter and it does implement a very simple decrypt algorithm, it is not intended to be used as
it is supplied. Consider it to be a template which you can combine with a proper decryption algorithm to develop your own decryption
filter.
WARNING
It is important to note that a decryption filter can never provide complete security against attack. At some point the parser within Perl
needs to be able to scan the original decrypted source. That means that at some stage fragments of the source will exist in a memory
buffer.
Also, with the introduction of the Perl Compiler backend modules, and the B::Deparse module in particular, using a Source Filter to hide
source code is becoming an increasingly futile exercise.
The best you can hope to achieve by decrypting your Perl source using a source filter is to make it unavailable to the casual user.
Given that proviso, there are a number of things you can do to make life more difficult for the prospective cracker.
1. Strip the Perl binary to remove all symbols.
2. Build the decrypt extension using static linking. If the extension is provided as a dynamic module, there is nothing to stop someone
from linking it at run time with a modified Perl binary.
3. Do not build Perl with "-DDEBUGGING". If you do then your source can be retrieved with the "-Dp" command line option.
The sample filter contains logic to detect the "DEBUGGING" option.
4. Do not build Perl with C debugging support enabled.
5. Do not implement the decryption filter as a sub-process (like the cpp source filter). It is possible to peek into the pipe that
connects to the sub-process.
6. Check that the Perl Compiler isn't being used.
There is code in the BOOT: section of decrypt.xs that shows how to detect the presence of the Compiler. Make sure you include it in
your module.
Assuming you haven't taken any steps to spot when the compiler is in use and you have an encrypted Perl script called "myscript.pl",
you can get access the source code inside it using the perl Compiler backend, like this
perl -MO=Deparse myscript.pl
Note that even if you have included the BOOT: test, it is still possible to use the Deparse module to get the source code for
individual subroutines.
7. Do not use the decrypt filter as-is. The algorithm used in this filter has been purposefully left simple.
If you feel that the source filtering mechanism is not secure enough you could try using the unexec/undump method. See the Perl FAQ for
further details.
AUTHOR
Paul Marquess
DATE
19th December 1995
perl v5.16.3 2013-04-02 decrypt(3)