scan

[Mike Wexler]

> *** amusing & useful program ***
> 
> What follows is an amusing and useful program to repeatedly execute
> command(s) and display their output on the screen...overlaying
I have modified this program to work with termcap.  Also I have
added a makefile and documentation in man form. I personally find
documentation in man format much more useful than nroffed output because
I can use it with the man program.  I think that most people have it.
If you need a formatted version please send me mail at 
trwrb!felix!peregrine!mike. 

Mike(always a dreamer) Wexler
15530 Rockfield, Building C
Irvine, Ca 92718
(714)855-3923
(trwrb|scgvaxd)!felix!peregrine!mike
-------------------- cut here -------------------------------------------
#! /bin/sh
# This is a shell archive, meaning:
# 1. Remove everything above the #! /bin/sh line.
# 2. Save the resulting text in a file.
# 3. Execute the file with /bin/sh (not csh) to create the files:
#	scan.l
#	scan.c
#	makefile
# This archive created: Thu Oct 17 17:35:02 1985
export PATH; PATH=/bin:$PATH
if test -f 'scan.l'
then
	echo shar: will not over-write existing file "'scan.l'"
else
cat << \SHAR_EOF > 'scan.l'
.TH SCAN l "17 October, 1985"
.SH NAME
scan \- repeat a command
.SH SYNOPSIS
scan [-s delay] [quoted_command_string]
.SH DESCRIPTION
.PP
.I Scan
repeats commands over and over displaying only the first
screenful via 
.IR curses (3X).
Thus, one can view the changes.
.PP
The default command is "ps -af" and the default
delay between repeats of commands in 4 seconds.
Commands must be quoted.
.PP
Stop it by interrupting.
.SH EXAMPLES
.RB
scan "date;ps -fu root & df"
.PP
Will run
.IR date (1),
then the 
.IR ps (1)
in the background and 
.IR df (1),
wait for the
.IR df (1),
display as much as will fit on the screen of the entire output,
and repeat.
.SH OPTIONS
.IP "-s delay"
Set the delay between refreshing the screen. 
A delay of zero seconds IS possible.
.SH AUTHORS
.PP
Jeffrey Greenberg (allegra!phri!dolphy!jmg)
.PP
Rusty Wright (sdcarl!rusty).
.SH BUGS
.PP
A delay of zero will keep your cpu very busy.
SHAR_EOF
fi # end of overwriting check
if test -f 'scan.c'
then
	echo shar: will not over-write existing file "'scan.c'"
else
cat << \SHAR_EOF > 'scan.c'
/*
 * scan: 'real time' screen display - by jeffrey greenberg
 * Copyright 1984 Jeffrey Greenberg * ALL RIGHTS RESERVED
 * Source given for non-profit use only! (Please give me credit &
 *	mail me changes!)
 *
 * compile: cc scan.c -lcurses
 * Should run on system 5...
 *
 * Oct 17, 1985 by Michael C Wexler(trwrb!felix!peregrine!mike)
 *	Added V7 flag to allow running under Version 7 derivatives
 */
#include <stdio.h>
#include <curses.h>

int seconds;

main(argc, argv)
int argc; char *argv[];
{
	FILE *str;
	int intrp();
	int c;
	int minarg;
	char *execstr, *getopts();
	char *copyright;
	copyright = "Jeffrey Greenberg 1984/85 - ALL RIGHTS RESERVED";

	execstr = getopts(argc,argv);

	initscr();
	signal(2,intrp);
	nonl();
#ifndef V7		/* modified Oct 17, 1985 by MCW					*/
	cbreak();
#else
	crmode();
#endif
	noecho();
	clear();
	refresh();

loop:
	if( (str = popen( execstr, "r")) == NULL )
		panic( execstr );

	move(0,0);
	while( (c=fgetc( str )) != EOF )
		addch(c);
	clrtobot();
	refresh();

	pclose( str );

	if(seconds )
		sleep( seconds );

	goto loop;
}

panic( str )
char *str;
{
	perror( str );
	cleanup();
	exit(1);
}

intrp()
{
	cleanup();
	exit(0);
}

cleanup()
{
	echo(); nl();
#ifndef V7		/* modified by MCW on Oct 17, 1985					*/
	nocbreak();
#endif
	endwin();
}

char *
getopts( argc, argv )
int argc;
char **argv;
{
	int option, badopt = 0;
	extern int optind;
	extern char *optarg;
	static char exec_default[] = {"ps -af"};
	char *execstr;

	seconds = 4;	/* default sleep time in seconds */

	while( (option=getopt(argc,argv,"s:")) != EOF )
		if( option == 's' ) {
			if( (seconds = atoi(optarg)) < 0)
				++badopt;
		}
		else {
			++badopt;
		}
	if( badopt ) {
		fprintf(stderr,"Usage: scan [-s seconds] [quoted_command_string]\n");
		exit(1);
	}

	if( (argc - 1) < optind )
		execstr = exec_default;
	else
		execstr = argv[optind];

	return execstr;
}
SHAR_EOF
fi # end of overwriting check
if test -f 'makefile'
then
	echo shar: will not over-write existing file "'makefile'"
else
cat << \SHAR_EOF > 'makefile'
# Installation parameters
# Directory where local binaries are put
BIN=/usr/local/bin
# Directory where manual pages are put
MAN=/usr/man/manl
# load termcap library(termlib on System V)
TERMCAP=-ltermcap
# Operating system:
#	V7 - version 7 and 4.? BSD
#	SYS - for System III & System V
OPSYS=V7
# Don't change past here
CFLAGS=-O -D$(OPSYS) $(OPT)
LFLAGS=-s
LOADLIBES=-lcurses $(TERMCAP)
LIB=scan.o
OUT=scan.bin
ALL: $(OUT)
$(OUT): $(LIB)
.SUFFIXES:
.SUFFIXES: .c .o .bin
.c.o:
	$(CC) $(CFLAGS) -c $<
.o.bin:
	$(CC) -o $@ $(LFLAGS) $< $(LOADLIBES)
clean:
	rm *.o
install:
	ln scan.l $(MAN)
	ln scan.bin $(BIN)/scan
SHAR_EOF
fi # end of overwriting check
#	End of shell archive
exit 0
-- 
Mike(always a dreamer) Wexler
15530 Rockfield, Building C
Irvine, Ca 92718
(714)855-3923
(trwrb|scgvaxd)!felix!peregrine!mike