Trying to implement 'more' command Post: 302197254

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Top Forums Shell Programming and Scripting Trying to implement 'more' command Post 302197254 by Cellofan on Tuesday 20th of May 2008 02:39:35 PM

05-20-2008

Registered User

Trying to implement 'more' command

Hi all, i'm quite new in the UNIX world. So maybe i'm going to ask simple questions but they are unsolvable for me...
I'm trying to implement the 'more' function or kinda of that, for improving my knowledges. But I encountered some problems that i hope u will help me to solve.
The code i developed till now follows below. I put in red the parts that I couldn't manage to implement with some comments.

#!/bin/ksh
clear;
a=$(stty -a|sed -n '2p'|awk '{print $3}'|nawk 'sub(".$","")') #returns the number of rows of the present shell and save it in the variable a
b=$(cat $1|wc -l) #returns the number of lines of the file
c=$(stty -a|sed -n '2p'|awk '{print $6}'|nawk 'sub(".$","")') #returns the number of columns of the present shell and save it in the variable c
count=$a;
temp=1;

while [ $count -le $b ] ; do
bold=`tput smso`
offbold=`tput rmso`
echo "${bold}Press 'c' if you want to continue, 'b' if you want to go back,'q' if you want to quit${offbold} \c"
read ANSW
case "$ANSW" in

[Cc])
e=0;
for <condition>; do #the following cycle must be done for each line that i want to observe
if ( col_line -gt $c ); do #if the number of columns of EACH line is bigger than the number of columns of the shell
d=col_line/$c; #d contains the ratio between the numb of col of the single line and the numb of col of the shell
d=round d; #d must be rounded to the SMALLER nearest integer
e=`expr $e + $d`
fi
done
count=`expr $count - $e` #count will be equal to the exact number of lines
sed -n "$temp,`expr $count - 1` p" $1
temp=$count;
count=`expr $count + $a`
;;
[Bb])
count=`expr $temp -$a + 1`
sed -n "$count,$temp, p" $1;
temp=$count;
;;
[Qq])
exit 1
;;
*) echo You answered a nonsense word, retype the answer
sleep 1
;;
esac

done

The main problems are:
- what is the condition i should put in the while cycle
- what is the condition i should put in the for cycle
- how can i get the value of col_line (number of columns of each line of the text file)
- how can i keep the value of count and temp to use them in case I press 'b'?
- how can i make the written inside 'echo' disappear (as in 'more' command)?

Thanks in advance for answering

Cellofan

Cellofan

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LEARN ABOUT DEBIAN

extutils::f77

F77(3pm)						User Contributed Perl Documentation						  F77(3pm)

NAME

       ExtUtils::F77 - Simple interface to F77 libs

DESCRIPTION

       This module tries to figure out how to link C programs with Fortran subroutines on your system. Basically one must add a list of Fortran
       runtime libraries. The problem is their location and name varies with each OS/compiler combination!

       This module tries to implement a simple 'rule-of-thumb' database for various flavours of UNIX systems.  A simple self-documenting Perl
       database of knowledge/code for figuring out how to link for various combinations of OS and compiler is embedded in the modules Perl code.
       Please help save the world by sending database entries for your system to karl_pgplot@mac.com

       Note the default on most systems is now to search for a generic 'GNU' compiler which can be g77, gfortran or g95 and then find the
       appropriate link libraries automatically. (This is the 'Generic' 'GNU' database entry in the code.)

       The library list which the module returns can be explicitly overridden by setting the environment variable F77LIBS, e.g.

	 % setenv F77LIBS "-lfoo -lbar"
	 % perl Makefile.PL
	 ...

SYNOPSIS

	 use ExtUtils::F77;		  # Automatic guess
	 use ExtUtils::F77 qw(sunos);	  # Specify system
	 use ExtUtils::F77 qw(linux g77); # Specify system and compiler
	 $fortranlibs = ExtUtils::F77->runtime;

METHODS

       The following methods are provided:

       o   runtime

	   Returns a list of F77 runtime libraries.

	     $fortranlibs = ExtUtils::F77->runtime;

       o   runtimeok

	   Returns TRUE only if runtime libraries have been found successfully.

       o   trail_

	   Returns true if F77 names have trailing underscores.

       o   compiler

	   Returns command to execute the compiler (e.g. 'f77').

       o   cflags

	   Returns compiler flags.

       o   testcompiler

	   Test to see if compiler actually works.

       More methods  will probably be added in the future.

AUTHOR

       Karl Glazebrook (karlglazebrook@mac.com).

perl v5.10.1							    2011-01-01								  F77(3pm)

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