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Old 07-16-2008, 01:37 AM   #1
Bamahut
LQ Newbie
 
Registered: Jul 2008
Posts: 3

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Question How to get a Bash to count user sessions without WC


Hi,

I'm looking for a way to count the numbers of user sessions opened without the help of the command WC, it just need to tell me how many users are online and tell me the numbers of sessions the user have active.

I can get the list of users connected, and sort them by alphabetical order:

w | tail -n +3 | sort -d | cut -d\ -f1>testw.txt;

Any help would be greatly appreciated!
 
Old 07-16-2008, 02:45 AM   #2
Bamahut
LQ Newbie
 
Registered: Jul 2008
Posts: 3

Original Poster
Rep: Reputation: 0
How to get a Bash to count user sessions without WC

I got a friend of mine to help me solve shit problem, and he came up with this scrip:

w | tail -n+3 | sort -n>toto
BOOL=F;
CPT=0;
while read MOT1 MOT2; do
VERIF="$VERIF$MOT1 ";
done<toto;
set $VERIF;
while [ $# != 0 ]; do
if [ z$1 = z$2 ]; then
CPT=$((CPT + 1));
BOOL=V;
else
BOOL=F;
fi;
if [ $BOOL = F ]; then
CPT=$(($CPT+1));
echo "$1 a $CPT processus;"
CPT=0;
shift;
else
shift;
fi;
done;
 
Old 07-16-2008, 03:25 AM   #3
bigearsbilly
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Registered: Mar 2004
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Distribution: FreeBSD, Debian, Mint, Puppy
Posts: 3,269

Rep: Reputation: 165Reputation: 165
why?
that's an awful looking script!

what's wrong with wc
 
Old 07-16-2008, 03:33 AM   #4
gnashley
Amigo developer
 
Registered: Dec 2003
Location: Germany
Distribution: Slackware
Posts: 4,724

Rep: Reputation: 449Reputation: 449Reputation: 449Reputation: 449Reputation: 449
I don't understand why you wouldn't want to use wc, or why it's any better to use tail and sort, but I worked out code in pure BASH for all three commands and 10 more. They are all avialable here:
http://distro.ibiblio.org/pub/linux/...ects/BashTrix/

Here's the code for wc:
Code:
#!/bin/bash
# copyright 2007 Gilbert Ashley <amigo@ibiblio.org>
# BashTrix wc is an implementation of the 'wc' command
# written in pure shell. Most wc options are supported.
VERSION=0.2

# show program usage
show_usage() {
echo
echo "Usage: ${0##/*} [OPTION]... [FILE]..."
echo "${0##/} -[m|w|l|L] FILE"
echo "  or: (cat|echo) | ${0##/*} [OPTION]... "
echo "Print newline, word, and byte counts for each FILE"
echo "and a total line if more than one FILE is specified."
# echo "With no FILE, or when FILE is - read standard input." #conflicts
echo "  -m, --chars            print the character counts"
echo "  -l, --lines            print the newline counts"
echo "  -L, --max-line-length  print the length of the longest line"
echo "  -w, --words            print the word counts"
echo "      --help     display this help and exit"
echo "      --version  output version information and exit"
exit
}
show_version() {
echo ${0##/*}" (BashTrix) $VERSION"
echo "Copyright 2007 Gilbert Ashley <amigo@ibiblio.org>"
echo "This is free software written in pure POSIX shell."
exit
}

# Minimum number of arguments needed by this program
MINARGS=1
# show usage if '-h' or  '--help' is the first argument or no argument is given
case $1 in
	""|"-h"|"--help") show_usage ;;
	"--version") show_version ;;
esac
# get the number of command-line arguments given
ARGC=$#
# check to make sure enough arguments were given or exit
if [[ $ARGC -lt $MINARGS ]] ; then
 echo "Too few arguments given (Minimum:$MINARGS)"
 echo
 show_usage
fi

for WORD in "$@" ; do
	case $WORD in
		-*)  true ;
			case $WORD in
				-m) COUNT_CHARS=1 ; shift ;;
				-w) COUNT_WORDS=1 ; shift ;;
				-l) COUNT_LINES=1 ; shift ;;
				-L) MAX_LINE_LENGTH=1 ; shift ;;
				--help) show_usage ;;
				--version) show_version ;;
				# -) READ_STDIN=1 ; shift ;;
				-*) echo "Unrecognized argument" ; show_usage ;;
			esac
		;;
	esac
done

# function _freq counts the number of matches
# of PATTERN in PARSESTRING and returns FREQ
# example usage: _freq $PATTERN $PARSESTRING
function _freq() { FREQ=0
! [[ $PATTERN ]] && PATTERN=$1
! [[ $PARSESTRING ]] && PARSESTRING=$2
while [[ $PARSESTRING != "" ]] ; do
	case $PARSESTRING in
		*$PATTERN*) (( FREQ++ )) ;
			PARSESTRING=${PARSESTRING#*${PATTERN}} ;;
		*) PARSESTRING="" ;;
	esac
done
echo $FREQ
}

# convert tabs to spaces
function uniform_white() {
while read GAGA ; do
 echo $GAGA
done
}

# function _line_word_count counts the words in a line
function _line_word_count() { LINE_WORD_COUNT=0
# turn all TABS into single spaces
STRING=$(echo $1 | uniform_white)
# strip off leading spaces
SEP=" "
while [[ ${STRING:0:1} = $SEP ]] ; do
 STRING=${STRING:1}
done
# strip trailing spaces
OFFSET=$(( ${#STRING} - 1 ))
while [[ ${STRING:$OFFSET:1} = $SEP ]] ; do
 # remove one CHAR from the STRING
 STRING=${STRING:0:$OFFSET}
 # decrement the OFFSET by one for the removed character
 (( OFFSET-- ))
done
PARSESTRING=$STRING
# count the number of spaces
_freq " " $PARSESTRING 1> /dev/null
# the number of words is spaces +1 except for blank lines
if [[ "$STRING" != "" ]] ; then
 LINE_WORD_COUNT=$(( $FREQ + 1 ))
fi
}

# function _line_char_count counts the characters in a line UNUSED
function _line_char_count() { LINE_CHAR_COUNT=0
#PARSESTRING=$(echo $1 | uniform_white)
PARSESTRING="$1"
while [[ $PARSESTRING != "" ]] ; do
	# read one character
	FC=${PARSESTRING:0:1}
	# advance the poiter one character
	PARSESTRING=${PARSESTRING:1}
	(( LINE_CHAR_COUNT++ ))
done
# add an extra character for the end of line CHAR
(( LINE_CHAR_COUNT++ ))
}

if [[ $# -gt 0 ]] ; then
	FILE_COUNT=0
	TOTAL_LINE_COUNT=0
	TOTAL_WORD_COUNT=0
	TOTAL_CHAR_COUNT=0
	TOTAL_LONGEST_LINE=0
	while [[ $# -gt 0 ]] ; do
		# count number of input files
		(( FILE_COUNT++ ))
		FILE_NAME="$1"
		if [ ! -r "$1" ] ; then
			echo "Cannot find file $1" 1>&2
			exit 1
		else
			FILE_LINE_COUNT=0
			FILE_WORD_COUNT=0
			FILE_CHAR_COUNT=0
			FILE_LONGEST_LINE=0
			LINE=
			IFS=
			while read LINE ; do
			  # add the curent line to the line counter
			  (( FILE_LINE_COUNT++ ))
			  # capture the text of the line
			  STRING="$LINE"
			  # count the words in this line
			  if [[ $COUNT_WORDS ]] ; then
			    _line_word_count $STRING
			    FILE_WORD_COUNT=$(( $FILE_WORD_COUNT + $LINE_WORD_COUNT ))
			  fi
			  # count the characters in this line
			  if [[ $COUNT_CHARS ]] ; then
			    LINE_CHAR_COUNT=$(( ${#LINE} + 1 ))
			    FILE_CHAR_COUNT=$(( $FILE_CHAR_COUNT + $LINE_CHAR_COUNT ))
			  fi
			  if [[ $MAX_LINE_LENGTH ]] ; then
				LINE_CHAR_COUNT=$(( ${#LINE} ))
				if [[ $LINE_CHAR_COUNT -gt $FILE_LONGEST_LINE ]] ; then
					FILE_LONGEST_LINE=$LINE_CHAR_COUNT
				fi
			  fi
			# go to next LINE
			done <"$1"
			TOTAL_LINE_COUNT=$((TOTAL_LINE_COUNT + $FILE_LINE_COUNT))
			TOTAL_WORD_COUNT=$(( $TOTAL_WORD_COUNT + $FILE_WORD_COUNT ))
			TOTAL_CHAR_COUNT=$(( $TOTAL_CHAR_COUNT + $FILE_CHAR_COUNT ))
		fi
		
		if [[ $FILE_LONGEST_LINE -gt  $TOTAL_LONGEST_LINE ]] ; then
				TOTAL_LONGEST_LINE=$FILE_LONGEST_LINE
		fi
		
		FILE_OUTPUT="$(echo $FILE_LINE_COUNT $FILE_WORD_COUNT $FILE_CHAR_COUNT \
				$FILE_LONGEST_LINE $FILE_NAME | uniform_white)"
		echo $FILE_OUTPUT
	# go to next FILE in $@
	shift
	done
	
	# detect multiple input files so the totals can be shown
	if [[ $FILE_COUNT -gt 1 ]] ; then
	 TOTAL_OUTPUT="$(echo $TOTAL_LINE_COUNT $TOTAL_WORD_COUNT $TOTAL_CHAR_COUNT \
			$TOTAL_LONGEST_LINE total | uniform_white)"
	 echo $TOTAL_OUTPUT
	fi
	exit
else
	# accept piped-in input only if "$@" is empty  ( $#=0 )
	# elif [[ $READ_STDIN ]] would enforce the POSIX
	# piped input is presumed to be separated into lines already
	FILE_LINE_COUNT=0
	FILE_WORD_COUNT=0
	FILE_CHAR_COUNT=0
	FILE_LONGEST_LINE=0
	IFS=
	while read LINE ; do
		# capture the text of the line
		STRING="$LINE"
		#increment the line counter
		(( FILE_LINE_COUNT++ ))
		# count hte words in a line
		if [[ $COUNT_WORDS ]] ; then
			_line_word_count $STRING
			TOTAL_WORD_COUNT=$(( $TOTAL_WORD_COUNT + $LINE_WORD_COUNT ))
		fi
		# count the characters in a line
		if [[ $COUNT_CHARS ]] ; then
			LINE_CHAR_COUNT=$(( ${#LINE} +1 ))
			TOTAL_CHAR_COUNT=$(( $TOTAL_CHAR_COUNT + $LINE_CHAR_COUNT ))
		fi
		# find the length of the longest line
		if [[ $MAX_LINE_LENGTH ]] ; then
			LINE_CHAR_COUNT=$(( ${#LINE} ))
			if [[ $LINE_CHAR_COUNT -gt $FILE_LONGEST_LINE ]] ; then
				FILE_LONGEST_LINE=$LINE_CHAR_COUNT
			fi
		fi
		# go to the next LINE
		shift
	done
	TOTAL_LINE_COUNT=$((TOTAL_LINE_COUNT + $FILE_LINE_COUNT))
	TOTAL_WORD_COUNT=$(( $TOTAL_WORD_COUNT + $FILE_WORD_COUNT ))
	TOTAL_CHAR_COUNT=$(( $TOTAL_CHAR_COUNT + $FILE_CHAR_COUNT ))
	TOTAL_LONGEST_LINE=$FILE_LONGEST_LINE
	SHOW_TOTALS=1
	shift
	# printf "%-5s %-20s %s\n" "hello" "you" there
	TOTAL_OUTPUT="$(echo $TOTAL_LINE_COUNT $TOTAL_WORD_COUNT $TOTAL_CHAR_COUNT \
			$TOTAL_LONGEST_LINE total | uniform_white)"
	TOTAL_OUTPUT="$(printf "%s %-2s %-2s %-2s %s\n" $TOTAL_LINE_COUNT $TOTAL_WORD_COUNT \
		$TOTAL_CHAR_COUNT $TOTAL_LONGEST_LINE total)"
	
	echo $TOTAL_OUTPUT
	exit
fi

exit $ERROR
All 13 programs - cat, dirname, head, sort, tr, wc, basename, cut, grep, rev, tail, uniq and which, are written for easy reading(hopefully) and so are much longer than is really needed to do the job. Still, most only emulate the basic options for each command. I found the basename, dirname and cat commands pretty much done by others and wrote the rest from scratch.

It made a really interesting project to implement a few of these and some of the commands do some things the originals are not capable of. cut and sort were very tricky. Some day I'll revisit that corner of my system and write a few more.
 
Old 07-16-2008, 04:27 AM   #5
Bamahut
LQ Newbie
 
Registered: Jul 2008
Posts: 3

Original Poster
Rep: Reputation: 0
Quote:
Originally Posted by gnashley View Post
I don't understand why you wouldn't want to use wc, or why it's any better to use tail and sort, but I worked out code in pure BASH for all three commands and 10 more. They are all avialable here:
http://distro.ibiblio.org/pub/linux/...ects/BashTrix/

Here's the code for wc:
Code:
#!/bin/bash
# copyright 2007 Gilbert Ashley <amigo@ibiblio.org>
# BashTrix wc is an implementation of the 'wc' command
# written in pure shell. Most wc options are supported.
VERSION=0.2

# show program usage
show_usage() {
echo
echo "Usage: ${0##/*} [OPTION]... [FILE]..."
echo "${0##/} -[m|w|l|L] FILE"
echo "  or: (cat|echo) | ${0##/*} [OPTION]... "
echo "Print newline, word, and byte counts for each FILE"
echo "and a total line if more than one FILE is specified."
# echo "With no FILE, or when FILE is - read standard input." #conflicts
echo "  -m, --chars            print the character counts"
echo "  -l, --lines            print the newline counts"
echo "  -L, --max-line-length  print the length of the longest line"
echo "  -w, --words            print the word counts"
echo "      --help     display this help and exit"
echo "      --version  output version information and exit"
exit
}
show_version() {
echo ${0##/*}" (BashTrix) $VERSION"
echo "Copyright 2007 Gilbert Ashley <amigo@ibiblio.org>"
echo "This is free software written in pure POSIX shell."
exit
}

# Minimum number of arguments needed by this program
MINARGS=1
# show usage if '-h' or  '--help' is the first argument or no argument is given
case $1 in
	""|"-h"|"--help") show_usage ;;
	"--version") show_version ;;
esac
# get the number of command-line arguments given
ARGC=$#
# check to make sure enough arguments were given or exit
if [[ $ARGC -lt $MINARGS ]] ; then
 echo "Too few arguments given (Minimum:$MINARGS)"
 echo
 show_usage
fi

for WORD in "$@" ; do
	case $WORD in
		-*)  true ;
			case $WORD in
				-m) COUNT_CHARS=1 ; shift ;;
				-w) COUNT_WORDS=1 ; shift ;;
				-l) COUNT_LINES=1 ; shift ;;
				-L) MAX_LINE_LENGTH=1 ; shift ;;
				--help) show_usage ;;
				--version) show_version ;;
				# -) READ_STDIN=1 ; shift ;;
				-*) echo "Unrecognized argument" ; show_usage ;;
			esac
		;;
	esac
done

# function _freq counts the number of matches
# of PATTERN in PARSESTRING and returns FREQ
# example usage: _freq $PATTERN $PARSESTRING
function _freq() { FREQ=0
! [[ $PATTERN ]] && PATTERN=$1
! [[ $PARSESTRING ]] && PARSESTRING=$2
while [[ $PARSESTRING != "" ]] ; do
	case $PARSESTRING in
		*$PATTERN*) (( FREQ++ )) ;
			PARSESTRING=${PARSESTRING#*${PATTERN}} ;;
		*) PARSESTRING="" ;;
	esac
done
echo $FREQ
}

# convert tabs to spaces
function uniform_white() {
while read GAGA ; do
 echo $GAGA
done
}

# function _line_word_count counts the words in a line
function _line_word_count() { LINE_WORD_COUNT=0
# turn all TABS into single spaces
STRING=$(echo $1 | uniform_white)
# strip off leading spaces
SEP=" "
while [[ ${STRING:0:1} = $SEP ]] ; do
 STRING=${STRING:1}
done
# strip trailing spaces
OFFSET=$(( ${#STRING} - 1 ))
while [[ ${STRING:$OFFSET:1} = $SEP ]] ; do
 # remove one CHAR from the STRING
 STRING=${STRING:0:$OFFSET}
 # decrement the OFFSET by one for the removed character
 (( OFFSET-- ))
done
PARSESTRING=$STRING
# count the number of spaces
_freq " " $PARSESTRING 1> /dev/null
# the number of words is spaces +1 except for blank lines
if [[ "$STRING" != "" ]] ; then
 LINE_WORD_COUNT=$(( $FREQ + 1 ))
fi
}

# function _line_char_count counts the characters in a line UNUSED
function _line_char_count() { LINE_CHAR_COUNT=0
#PARSESTRING=$(echo $1 | uniform_white)
PARSESTRING="$1"
while [[ $PARSESTRING != "" ]] ; do
	# read one character
	FC=${PARSESTRING:0:1}
	# advance the poiter one character
	PARSESTRING=${PARSESTRING:1}
	(( LINE_CHAR_COUNT++ ))
done
# add an extra character for the end of line CHAR
(( LINE_CHAR_COUNT++ ))
}

if [[ $# -gt 0 ]] ; then
	FILE_COUNT=0
	TOTAL_LINE_COUNT=0
	TOTAL_WORD_COUNT=0
	TOTAL_CHAR_COUNT=0
	TOTAL_LONGEST_LINE=0
	while [[ $# -gt 0 ]] ; do
		# count number of input files
		(( FILE_COUNT++ ))
		FILE_NAME="$1"
		if [ ! -r "$1" ] ; then
			echo "Cannot find file $1" 1>&2
			exit 1
		else
			FILE_LINE_COUNT=0
			FILE_WORD_COUNT=0
			FILE_CHAR_COUNT=0
			FILE_LONGEST_LINE=0
			LINE=
			IFS=
			while read LINE ; do
			  # add the curent line to the line counter
			  (( FILE_LINE_COUNT++ ))
			  # capture the text of the line
			  STRING="$LINE"
			  # count the words in this line
			  if [[ $COUNT_WORDS ]] ; then
			    _line_word_count $STRING
			    FILE_WORD_COUNT=$(( $FILE_WORD_COUNT + $LINE_WORD_COUNT ))
			  fi
			  # count the characters in this line
			  if [[ $COUNT_CHARS ]] ; then
			    LINE_CHAR_COUNT=$(( ${#LINE} + 1 ))
			    FILE_CHAR_COUNT=$(( $FILE_CHAR_COUNT + $LINE_CHAR_COUNT ))
			  fi
			  if [[ $MAX_LINE_LENGTH ]] ; then
				LINE_CHAR_COUNT=$(( ${#LINE} ))
				if [[ $LINE_CHAR_COUNT -gt $FILE_LONGEST_LINE ]] ; then
					FILE_LONGEST_LINE=$LINE_CHAR_COUNT
				fi
			  fi
			# go to next LINE
			done <"$1"
			TOTAL_LINE_COUNT=$((TOTAL_LINE_COUNT + $FILE_LINE_COUNT))
			TOTAL_WORD_COUNT=$(( $TOTAL_WORD_COUNT + $FILE_WORD_COUNT ))
			TOTAL_CHAR_COUNT=$(( $TOTAL_CHAR_COUNT + $FILE_CHAR_COUNT ))
		fi
		
		if [[ $FILE_LONGEST_LINE -gt  $TOTAL_LONGEST_LINE ]] ; then
				TOTAL_LONGEST_LINE=$FILE_LONGEST_LINE
		fi
		
		FILE_OUTPUT="$(echo $FILE_LINE_COUNT $FILE_WORD_COUNT $FILE_CHAR_COUNT \
				$FILE_LONGEST_LINE $FILE_NAME | uniform_white)"
		echo $FILE_OUTPUT
	# go to next FILE in $@
	shift
	done
	
	# detect multiple input files so the totals can be shown
	if [[ $FILE_COUNT -gt 1 ]] ; then
	 TOTAL_OUTPUT="$(echo $TOTAL_LINE_COUNT $TOTAL_WORD_COUNT $TOTAL_CHAR_COUNT \
			$TOTAL_LONGEST_LINE total | uniform_white)"
	 echo $TOTAL_OUTPUT
	fi
	exit
else
	# accept piped-in input only if "$@" is empty  ( $#=0 )
	# elif [[ $READ_STDIN ]] would enforce the POSIX
	# piped input is presumed to be separated into lines already
	FILE_LINE_COUNT=0
	FILE_WORD_COUNT=0
	FILE_CHAR_COUNT=0
	FILE_LONGEST_LINE=0
	IFS=
	while read LINE ; do
		# capture the text of the line
		STRING="$LINE"
		#increment the line counter
		(( FILE_LINE_COUNT++ ))
		# count hte words in a line
		if [[ $COUNT_WORDS ]] ; then
			_line_word_count $STRING
			TOTAL_WORD_COUNT=$(( $TOTAL_WORD_COUNT + $LINE_WORD_COUNT ))
		fi
		# count the characters in a line
		if [[ $COUNT_CHARS ]] ; then
			LINE_CHAR_COUNT=$(( ${#LINE} +1 ))
			TOTAL_CHAR_COUNT=$(( $TOTAL_CHAR_COUNT + $LINE_CHAR_COUNT ))
		fi
		# find the length of the longest line
		if [[ $MAX_LINE_LENGTH ]] ; then
			LINE_CHAR_COUNT=$(( ${#LINE} ))
			if [[ $LINE_CHAR_COUNT -gt $FILE_LONGEST_LINE ]] ; then
				FILE_LONGEST_LINE=$LINE_CHAR_COUNT
			fi
		fi
		# go to the next LINE
		shift
	done
	TOTAL_LINE_COUNT=$((TOTAL_LINE_COUNT + $FILE_LINE_COUNT))
	TOTAL_WORD_COUNT=$(( $TOTAL_WORD_COUNT + $FILE_WORD_COUNT ))
	TOTAL_CHAR_COUNT=$(( $TOTAL_CHAR_COUNT + $FILE_CHAR_COUNT ))
	TOTAL_LONGEST_LINE=$FILE_LONGEST_LINE
	SHOW_TOTALS=1
	shift
	# printf "%-5s %-20s %s\n" "hello" "you" there
	TOTAL_OUTPUT="$(echo $TOTAL_LINE_COUNT $TOTAL_WORD_COUNT $TOTAL_CHAR_COUNT \
			$TOTAL_LONGEST_LINE total | uniform_white)"
	TOTAL_OUTPUT="$(printf "%s %-2s %-2s %-2s %s\n" $TOTAL_LINE_COUNT $TOTAL_WORD_COUNT \
		$TOTAL_CHAR_COUNT $TOTAL_LONGEST_LINE total)"
	
	echo $TOTAL_OUTPUT
	exit
fi

exit $ERROR
All 13 programs - cat, dirname, head, sort, tr, wc, basename, cut, grep, rev, tail, uniq and which, are written for easy reading(hopefully) and so are much longer than is really needed to do the job. Still, most only emulate the basic options for each command. I found the basename, dirname and cat commands pretty much done by others and wrote the rest from scratch.

It made a really interesting project to implement a few of these and some of the commands do some things the originals are not capable of. cut and sort were very tricky. Some day I'll revisit that corner of my system and write a few more.
Thanks for that info, this will help with another of my school project.
 
Old 07-16-2008, 06:52 AM   #6
ghostdog74
Senior Member
 
Registered: Aug 2006
Posts: 2,695
Blog Entries: 5

Rep: Reputation: 239Reputation: 239Reputation: 239
Quote:
Originally Posted by bigearsbilly View Post
what's wrong with wc
posts spelling out restrictions to using this and that most probably are school projects or homework.
 
  


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