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With krep you can add and remove filtering conditions (click to enlarge).

krep is a file viewer that lets you filter a file's content. You can add and remove filtering conditions without getting out of the work flow. If you do not give a file, standard input is shown. If the given file changes, krep reloads it.

Download

krep is now in KDE's svn repository. However, here is krep to download:

→ download KDE 4 version here

Installation

To install krep proceed like this. In this example we use the SUSE Linux 11.2 distribution, but it should work same or similar with any Linux:

svn co svn://anonsvn.kde.org/home/kde/trunk/playground/utils/krep/
yast -i libkde4-devel
cd krep
cmake . -DCMAKE_INSTALL_PREFIX=/usr/local -DLIB_SUFFIX=64 -DCMAKE_BUILD_TYPE=debugfull && make -j2 && make install