Shellscript Interpreting Post: 13571

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Top Forums UNIX for Dummies Questions & Answers Shellscript Interpreting Post 13571 by Ann on Friday 18th of January 2002 10:27:50 PM

01-18-2002

Registered User

Shellscript Interpreting

I am trying to interpret the following shellscript and am having a very difficult time. Could one of you Unix gurus pleasssseeee help me out? You just won't know how much of a life saver you would be for me.

Code:

PN=`basename "$0"`			# Program name
VER=`echo '$Revision: 1.2 $' | cut -d' ' -f2`

Usage () {
    echo "$PN - who is doing what, $VER (stv '95)
usage: $PN [-l] [-h] [user]
    -h: suppress the heading
    -l:	long form of output" >&2
    exit 1
}

Msg () {
    for i
    do echo "$PN: $i" >&2
    done
}

Fatal () { Msg "$@"; exit 1; }

LongOutput=no
Header=yes
while [ $# -gt 0 ]
do
    case "$1" in
	-l)	LongOutput=yes;;
	-h)	Header=no;;
	--)	shift; break;;
	-*)	Usage;;
	*)	break;;			# First file name
    esac
    shift
done

[ $# -gt 0 ] && User="$1"

if [ "$LongOutput" = no ]
then
    [ $Header = yes ] && {
	date
	uname -n
    }

    # Sample output of who:
    #	heiner   console Apr 26 08:18
    who |
	while read Name Tty Mon Day Time Host Rest
	do
	    [ -n "$User" -a "$User" != "$Name" ] && continue
	    echo "
$Tty	$Name	$Time"
	    case "$Tty" in
		*tty*)	T=`echo "$Tty" | sed -e 's:.*tty\(..\).*:\1:'`;;
		*)	T=`echo "$Tty" | sed -e 's:/dev/\(..\).*:\1:'`;;
	    esac

	    # Sample output of ps -c:
	    #	PID TT STAT  TIME COMMAND
	    #	327 p2 IW    0:19 ksh
	    ps -ct"$T" | tail +2 |
		while read pid tty stat time command
		do
		    echo "    $Tty	$pid	$time	$command"
		done
	done
else
    # Long form: use "w" output format
    if [ $Header = yes ]
    then FirstLine=1
    else FirstLine=3
    fi
    if [ -z "$User" ]
    then
	w
    else
	w | grep "$User"
    fi | tail +$FirstLine
fi

Thanks a million!!!!!!

added code tags for readability --oombera

Last edited by oombera; 02-18-2004 at 12:09 PM..

Ann

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LEARN ABOUT OPENSOLARIS

echo

echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME

       echo - echo arguments to standard output

SYNOPSIS

       /usr/ucb/echo [-n] [argument]

DESCRIPTION

       echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output.

       echo  is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi-
       ronment variables.

       For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows:

	   o	  echo your current-working-directory's full pathname

	   o	  pipe the output through tr to translate the path's embedded slash-characters into space-characters

	   o	  pipe that output through wc -w for a count of the names in your path.

		    example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w"

       See tr(1) and wc(1) for their functionality.

       The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be  invoked	if
       the  user  calls  echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape
       characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the  black-slashed  escape  characters,	and  ksh's
       echo() also understands a as the audible bell character; however, these commands do not have an -n option.

OPTIONS

       -n    Do not add the NEWLINE to the output.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5)

NOTES

       The -n option is a transition aid for BSD applications, and may not be supported in future  releases.

SunOS 5.11							    3 Aug 1994								  echo(1B)