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Thursday, 17 November 2011

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Find and Delete Duplicate files under Linux - Fdupes

20:00 No comments

fdupes is a program written by Adrian Lopez to scan directories for duplicate files, with options to list and delete them. It first compares file sizes and MD5 signatures, and then performs a byte-by-byte check for verification.
fdupes is written in C and is released under the MIT License.

fdupes installation:
Type the following command to install fdupes in Debian / Ubuntu Linux:

sudo apt-get install fdupes

Protects Networked Hosts from Brute Force Attacks - Sshguar

09:13 No comments

Sshguard is a small program that monitors services running on your machine from the log files. When it detects that someone is doing something bad to a service, sshguard blocks the IP address of the bad guy with a firewall rule.

Sshguard Log support:
Sshguard interprets log messages with several formats:
* syslog
* syslog-ng
* metalog
* multilog
* raw log
It can monitor multiple log files at once, and handles log rotation and temporary log files automatically. Its powerful grammar-based parser makes it straightforward to support several formats and services without increasing complexity.

Extracting Images from PDF files - Pdfimages

12:02 No comments

Pdfimages is an open source command-line utility for extracting images from PDF files. It is freely available as part of poppler-utils and xpdf-utils, and included by default with many Linux distributions.

Pdfimages saves images from a Portable Document Format (PDF) file as Portable Pixmap (PPM), Portable Bitmap (PBM), or JPEG files. Pdfimages reads the PDF file, scans one or more pages, PDF-file, and writes one PPM, PBM, or JPEG file for each image, image-root-nnn.xxx, where nnn is the image number and xxx is the image type (.ppm, .pbm,.jpg).

NB: pdfimages extracts the raw image data from the PDF file, without performing any additional transforms. Any rotation, clipping, color inversion, etc. done by the PDF content stream is ignored.