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Top Forums UNIX for Dummies Questions & Answers How to modify the cat command to highlight a chosen word? Post 302974840 by bakunin on Saturday 4th of June 2016 02:39:37 PM
Old 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:
Mod Comment 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.


I hope this helps.

bakunin
 

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scheme48(1)						      General Commands Manual						       scheme48(1)

NAME
scheme48 - a Scheme interpreter SYNOPSIS
scheme48 [-i image] [-h heapsize] [-a argument] DESCRIPTION
scheme48 is an implementation of the Scheme programming language as described in the Revised^5 Report on the Algorithmic Language Scheme. A runnable system requires two parts, an executable program that implements the Scheme 48 virtual machine, and an image that is used to initialize the store of the virtual machine. scheme48 is a shell script that starts the virtual machine with an image that runs in a Scheme command loop. The scheme48 command loop reads Scheme expressions, evaluates them, and prints their results. It also executes commands, which are identi- fied by an initial comma character. Type the command ,help to receive a list of available commands. The meaning of the -h option depends on the type of garbage collector that was chosen at configuration time. If heapsize is a positive number, it specifies the number of words that can be live at any given time. One word is four bytes. Cons cells are currently 3 words, so if you want to make sure you can allocate, say, a million cons cells, you should specify -h 3000000 (actually a little more, to account for the initial heap image and breathing room). If you specify a maximum smaller than the memory needed to load the image file, the maximum is increased accordingly and a message is writ- ten to the console. For the BIBOP garbage collector, heapsize may be 0. This means the heap will possibly keep growing until your system runs out of memory. Because of this risk, a warning message is written to the console if you specify -h 0. The ,dump and ,build commands put heap images in files. The -i option causes the initial heap image to be taken from file image. The -a option causes a list of strings to be passed as the argument to an image generated using the ,build command. The first argument to ,build is a procedure that is passed the arguments following -a and which should return an integer (which is the return value of the Scheme 48 process). > ,build (lambda (a) (display a) (newline) 0) foo.image > ,exit $ scheme48 -i foo.image -a mumble mumble $ FILES
/usr/lib/scheme48-1.`cat ./build/minor-version-number`/scheme48vm the virtual machine. /usr/lib/scheme48-1.`cat ./build/minor-version-number`/scheme48.image the default image. scheme48(1)
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