Recommendation: good file compare program ?

[Bruce Marshall]

On Monday 29 October 2007, Owen Townend wrote:
> svobi,
>         Another thing most newbs aren't aware of is 'man -k'. It is a way
> to search the man page command names and brief description. E.g. 'man -k
> compare' returns for me this:

And another good command to know is:

apropos  fax

which gave me:

coverpg (1)          - create a fax coverpg on stdout
efax (1)             - send/receive faxes with Class 1, 2 or 2.0 fax modem
efix (1)             - convert between fax, text, bit-map and gray-scale 
formats
fax (1)              - make, send, receive, view or print a fax
fax2ps (1)           - convert a TIFF facsimile to compressed
fax2tiff (1)         - create a TIFF Class F fax file from raw fax data
faxq (1)             - display fax jobs queued by faxspool(1)
faxq-helper (8)      - privileged helper process to access the fax queue
faxqueue (5)         - sendfax fax spool queue control files
faxrm (1)            - remove fax jobs queued by faxspool(1)
faxrunq (1)          - send fax jobs queued by faxspool(1)
faxrunqd (8)         - daemon to send fax jobs queued by faxspool(1)
faxspool (1)         - queue and convert files for faxing with sendfax(8)
g32pbm (1)           - convert a Group 3 fax file into a portable bitmap
g3tolj (1)           - converts a Group 3 fax file into a printable HP-PCL 
file
g3topbm (1)          - convert a Group 3 fax file into a portable bitmap
g3toxwd (1)          - converts a Group 3 fax file into a displayable xwd file
kdeprintfax (1)      - a interface to fax-packages
kfax (1)             - KDE Fax Viewer
mgetty-fax (1)       - fax sending and receiving with mgetty+sendfax
pbm2g3 (1)           - convert portable bitmaps (PBM) into G3 fax files
pbmtog3 (1)          - convert a portable bitmap into a Group 3 fax file
pbmtopsg3 (1)        - convert PBM images to Postscript with G3 fax 
compression
sendfax (8)          - send group 3 fax files (G3 files) with a class 2 
faxmodem
sff2g3 (1)           - convert CAPI SFF fax files into G3 fax files
viewfax (1)          - display fax files in an X11 window