06-04-2016
Quote:
Originally Posted by
IndigoFox
Is it possible to modify the cat command (using a linux virtual machine) so that it displays text of a file and highlights a specifically chosen word?
Despite RudiC has already come up with some rather elaborate workarounds: the short answer is you can't. The reason is (as RudiC also mentioned) that
cat is intended for a different purpose.
Your questions amounts to "can i modify a hammer so that it drills holes". Yes, maybe, somehow, but why not use a drilling machine instead, which will be better suited for that from the start?
You can use
sed as mentioned to decorate certain words or phrases with highlighting code, but that is quirky at best and certainly not very portable (chances are it won't work in the same way on another system). If you just want to search for something and want to have it easier to see the found pieces use the
grep facility. In your Linuy system the
grep has a
--color option which should do what you want. If memory serves right this is even on by default. Otherwise cosult the man page of it.
Moderator's Comments:
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And, by the way: please do NOT post in the "Answers to Frequently Asked Questions" forum if you are not doing exactly that - write an essay about some frequently asked question. I have moved your thread to a more fitting forum. Thanks for your consideration.
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I hope this helps.
bakunin
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MAN(1) General Commands Manual MAN(1)
NAME
man - print out the manual
SYNOPSIS
man [ - ] [ -a ] [ -M path ] [ section ] title ...
DESCRIPTION
Man is the program which provides on-line access to the UNIX manual. If a section specifier is given, man looks in that section of the
manual for the given title(s). Section is either an Arabic section number (``3'' for example), or one of the words ``local'', ``new,'' or
``old''. (The abbreviations ``l'', ``n'', and ``o'' are also allowed.) If section is omitted, man searches all sections of the manual,
giving preference to commands over library subroutines, and displays the first manual page it finds, if any. If the -a option is supplied,
man displays all applicable manual pages.
Normally man checks in standard locations (/usr/man and /usr/local/man) for manual information. This can be changed by supplying a search
path (a la the Bourne shell) with the -M flag. The search path is a colon (``:'') separated list of directories in which man expects to
find the standard manual subdirectories. This search path can also be set with the environmental variable MANPATH.
Since some manual pages are intended for use only on certain machines, man only searches those directories applicable to the current
machine. Man's determination of the current machine type can be overridden by setting the environmental variable MACHINE.
If the standard output is a teletype, and the - flag is not provided, man uses more(1), or the pager provided by the environmental variable
PAGER, to display the manual page.
The FORTRAN version of section 3 of the manual may be specified by supplying man with the section ``3f''. Also, a specific section of the
local manual may be specified by appending a number to the section, i.e. ``l5'' would indicate section 5 of the local manual.
FILES
/usr/man standard manual area
/usr/man/cat?/* directories containing standard manual pages
/usr/local/man/cat?/* directories containing local manual pages
/usr/src/man directories containing unformatted manual pages
SEE ALSO
apropos(1), more(1), whatis(1), whereis(1)
BUGS
The manual is supposed to be reproducible either on the phototypesetter or on a typewriter, however, on a typewriter, some information is
necessarily lost.
4th Berkeley Distribution April 19, 1988 MAN(1)