Bash Programming

[Lakshmipathi]

anyone or any book who can teach me how to use bash/

"Advanced Bash-Scripting Guide" link shared by watael,is an excellent link to learn in-depth bash.

But there are lot of quick tutorials online,here is one of them (which used few years back)
http://www.giis.co.in/Bash_Shell_Programming.ppt

[Cancerous]

This isn't the one I did with the editing, I'm saying can I just do this.

I don't understand...

It displays Time First instead of Title first, I want to know why

You've assigned TIME to field one, and TITLE to field 2.
Just switch which field you're assigning them to in your cut commands.

Look at the cut man page as well as the echo man page.
Also, when assigning variables, instead of using backticks

variable=`command`

use

variable=$(command)

Backticks run in a sub-proccess which is less efficient than running them the other way.

[uglyboy]

anyone ? who is willing to give me your MSN.

Can I paste a screenshot of what I achieved and expect a response ?

[Cancerous]

Absolutely. Screenshots are great!
Also use the code tags around your code in comments, it retains formatting if you copy and paste text from the shell.

[uglyboy]

Absolutely. Screenshots are great!
Also use the code tags around your code in comments, it retains formatting if you copy and paste text from the shell.

Thanks, jst give me a while, I will post the SS, I just dont understand how do you replace this Movie Reservation to make it like the Airline Reservation.

I believe concept wise ,its the same.

Retrieving of the movielist / airlineinfo is from txt, so you can't use the printf method

[uglyboy]

#display main ticketing menu
display_menu()
{
  # Called by run_menu
  echo
  echo "-- Theatre’s Self-service Ticketing --"
  echo -n "1. "
  echo -e '\E[1;32;40mList all Movies and Show time\E[0m'
  echo -n "2. "
  echo -e '\E[1;32;40mDisplay theatre’s seat \E[0m'
  echo -n "q. "
  echo -e '\E[1;31;47mQuit\E[0m'
	
  echo -en "Enter your selection: "
}

# List out available movies
list_movies()
{
	# Called by run_menu
	
	old_IFS=$IFS 
	IFS=$'\n'
	print_movie_header
	for LINE in `sed -e 's/Yes/Ticket Available/g' -e 's/No/SOLD OUT/g' movielist.txt`  
	do
		print_movie $LINE
	done
  IFS=$old_IFS 
}
	
# Output header for movie listing
# Catered for both numbered and non-numbered list
print_movie_header()
{
	echo -e '\E[1;32;40m'
	if [ $# == "1" ];then
		echo -n "   "
	fi
	echo -n -e 'Movie Title'
  set_colwidth 'Movie Title' 25
	echo -n -e 'Show Time\t'
	if [ $# == "1" ];then
		echo -n -e "\t"
	fi
	echo -n 'Vacancy'
	echo -e '\E[0m'
}

# Set the width of column
# $1 is the text in the column 
# and $2 is the intended column width
set_colwidth()
{
	STRING=$1
	LENGTH=${#STRING}

	for (( i=$LENGTH; i<=$2; i++))
	do 
		echo -n " "
	done 

}

# Output movie entry
print_movie()
{
	TIME=`echo $1 | cut -f1 -d ","`
	TITLE=`echo $1 | cut -f2 -d ","`
	AVAILABLE=`echo $1 | cut -f3 -d ","` 
	#CHECK=`echo $1 | cut -f4 -d" ","`

	echo -n -e $TITLE
	set_colwidth $TITLE 25
	echo -n -e $TIME '\t'
  echo $AVAILABLE
#echo -n -e $CHECK
  }


# Hint2
# Get current seating arrangement of 
# selected movie from seating.txt
movie_data()
{
	COUNT=1
	old_IFS=$IFS 
	IFS=$'\n'
	for LINE in `cat seating.txt`  
	do
		if test $1 -eq $COUNT
			then
				display_seats $LINE $2

		fi
		THEATER[$COUNT]=$LINE
		let COUNT=COUNT+1
		
	done
  IFS=$old_IFS 	
}

# Mark occupied seat with a X and
# seats selected by user with a red X
mark_seat()
{
	# Called by display_seats
	
	if [ $(echo "$1" | grep -c "$2$3") -gt 0 ]
	then
			echo -n "X" 
		  set_colwidth "" 5
	elif [ $(echo "$4" | grep -c "$2$3") -gt 0 ]
	then
			echo -en '\E[1;31mX\E[0m'
		  set_colwidth "" 5
	else
			set_colwidth "" 6 
	fi
}

# Print out theater's seating arrangement
display_seats()
{
	COL=5
	ROW=4
	echo

	echo "---------------------------------------"
	echo -e '\E[1;34;47m----------------SCREEN-----------------\E[0m'
	echo "---------------------------------------"
	for (( x=0; x<=$ROW; x++))
	do 
	echo -n "$x" | tr "0" " "
		for (( j=0; j<=$COL; j++))
		do 
			if [ $x == "0" ]
			then
				echo -n $j | tr "012345" " ABCDE"
				set_colwidth "" 5
			else
				CURR_COL=$(echo $j | tr "12345" "ABCDE")
				if [ $j == "0" ]
				then
					set_colwidth "" 6
				else
					mark_seat $1 $CURR_COL $x $2
				fi
			fi
	done 
  echo ""
	done
	echo "---------------------------------------"
}


# Select and book seat manually
select_seat()
{
	# Called by run_menu
	
	COUNT=0
	echo
	echo "-- Select A Seat Manually --"
	echo
	old_IFS=$IFS 
	IFS=$'\n'
	print_movie_header "numbered"
	for LINE in `sed -e 's/Yes/Ticket Available/g' -e 's/No/SOLD OUT/g' movielist.txt `;do
		let COUNT=COUNT+1
		echo -n "$COUNT. "
		print_movie $LINE
	done
	IFS=$old_IFS 
	echo
	
	# Select movie to book
	echo -en "Select Movie To Book (Enter 1 to ${COUNT}): "
	read NUM
	NUMERIC=0
	while [ "$NUMERIC" != "1" ];do
		for (( x=$COUNT; x>=1; x--))
		do
			if [ $NUM == "$x" ];then
				NUMERIC=1
			fi
		done

		if [ "$NUMERIC" != "1" ];then
			echo -en "Invalid Movie Selected, Try Again (Enter 1 to ${COUNT}): "
			read NUM
		fi
	done

	movie_data $NUM
	echo
	old_IFS=$IFS 
	IFS=$'\n'
	
	 
	echo
}

# Main menu navigation
run_menu()
{
	i=-1
  while [ "$i" != "q" ]; do
		display_menu
		read i
		i=`echo $i | tr '[A-Z]' '[a-z]'`

		case "$i" in 
	  	"1")
			list_movies
			;;
		"2")
			select_seat
			;;
		"q")
			echo "GoodBye, Have A Nice Day"
			exit 0
			;;
		*)
			echo "Unrecognised Input."
			;;
		esac
  done
}


#----------------------------------------------#
# ---------PROGRAM SCRIPT START HERE---------- #
#----------------------------------------------#

if [ ! -f movielist.txt ]; then
  echo "Error: Movie list is not available"
fi


run_menu

1300 – 2Oct,The Social Network,No,
1300 – 2Oct,The Town,No,
1700 – 2Oct,Paranormal Activity 2,Yes,
1900 – 2Oct,You Again,Yes,
2100 – 2Oct,Kamui,Yes,

0;,A2,A3,A1,A7,A9
0;,E6,E7,E8

14;,A1,D4,C3,B3,A4,E4
15;,A1,D4,E2,C3,A2
15;,A1,B2,C3,D4,A4

[Cancerous]

What do you mean? Are you just trying to change the values so it looks like an airline timetable rather than a movie value?

You also need to show us the output you're getting currently.

All the commands are pretty basic in this script, if you're just trying to understand it look at the man pages.

[uglyboy]

blabla(ww.i6.minus.com/jDAuipsHCK41d.png

#display main ticketing menu
display_menu()
{
  # Called by run_menu
  echo
  echo "-- Theatre’s Self-service Ticketing --"
  echo -n "1. "
  echo -e '\E[1;32;40mList all Movies and Show time\E[0m'
  echo -n "2. "
  echo -e '\E[1;32;40mDisplay theatre’s seat \E[0m'
  echo -n "q. "
  echo -e '\E[1;31;47mQuit\E[0m'
	
  echo -en "Enter your selection: "
}

# List out available movies
list_movies()
{
	# Called by run_menu
	
	old_IFS=$IFS 
	IFS=$'\n'
	print_movie_header
	for LINE in `sed -e 's/Yes/Ticket Available/g' -e 's/No/SOLD OUT/g' movielist.txt`  
	do
		print_movie $LINE
	done
  IFS=$old_IFS 
}
	
# Output header for movie listing
# Catered for both numbered and non-numbered list
print_movie_header()
{
	echo -e '\E[1;32;40m'
	if [ $# == "1" ];then
		echo -n "   "
	fi
	echo -n -e 'Movie Title'
  set_colwidth 'Movie Title' 25
	echo -n -e 'Show Time\t'
	if [ $# == "1" ];then
		echo -n -e "\t"
	fi
	echo -n 'Vacancy'
	set_colwidth 'Vacancy' 12
	echo -n  'Cinema Showing'
	echo -e '\E[0m'
}

# Set the width of column
# $1 is the text in the column 
# and $2 is the intended column width
set_colwidth()
{
	STRING=$1
	LENGTH=${#STRING}

	for (( i=$LENGTH; i<=$2; i++))
	do 
		echo -n " "
	done 

}

# Output movie entry
print_movie()
{
	TIME=`echo $1 | cut -f1 -d ","`
	TITLE=`echo $1 | cut -f2 -d ","`
	AVAILABLE=`echo $1 | cut -f3 -d ","` 
	CHECK=`echo $1 | cut -f4 -d ""`

	echo -n -e $TITLE
	set_colwidth $TITLE 25
	echo -n -e $TIME '\t'
  echo $AVAILABLE
echo $CHECK
  }


# Hint2
# Get current seating arrangement of 
# selected movie from seating.txt
movie_data()
{
	COUNT=1
	old_IFS=$IFS 
	IFS=$'\n'
	for LINE in `cat seating.txt`  
	do
		if test $1 -eq $COUNT
			then
				display_seats $LINE $2

		fi
		THEATER[$COUNT]=$LINE
		let COUNT=COUNT+1
		
	done
  IFS=$old_IFS 	
}

# Mark occupied seat with a X and
# seats selected by user with a red X
mark_seat()
{
	# Called by display_seats
	
	if [ $(echo "$1" | grep -c "$2$3") -gt 0 ]
	then
			echo -n "X" 
		  set_colwidth "" 5
	elif [ $(echo "$4" | grep -c "$2$3") -gt 0 ]
	then
			echo -en '\E[1;31mX\E[0m'
		  set_colwidth "" 5
	else
			set_colwidth "" 6 
	fi
}

# Print out theater's seating arrangement
display_seats()
{
	COL=5
	ROW=4
	echo

	echo "---------------------------------------"
	echo -e '\E[1;34;47m----------------SCREEN-----------------\E[0m'
	echo "---------------------------------------"
	for (( x=0; x<=$ROW; x++))
	do 
	echo -n "$x" | tr "0" " "
		for (( j=0; j<=$COL; j++))
		do 
			if [ $x == "0" ]
			then
				echo -n $j | tr "012345" " ABCDE"
				set_colwidth "" 5
			else
				CURR_COL=$(echo $j | tr "12345" "ABCDE")
				if [ $j == "0" ]
				then
					set_colwidth "" 6
				else
					mark_seat $1 $CURR_COL $x $2
				fi
			fi
	done 
  echo ""
	done
	echo "---------------------------------------"
}


# Select and book seat manually
select_seat()
{
	# Called by run_menu
	
	COUNT=0
	echo
	echo "-- Select A Seat Manually --"
	echo
	old_IFS=$IFS 
	IFS=$'\n'
	print_movie_header "numbered"
	for LINE in `sed -e 's/Yes/Ticket Available/g' -e 's/No/SOLD OUT/g' movielist.txt `;do
		let COUNT=COUNT+1
		echo -n "$COUNT. "
		print_movie $LINE
	done
	IFS=$old_IFS 
	echo
	
	# Select movie to book
	echo -en "Select Movie To Book (Enter 1 to ${COUNT}): "
	read NUM
	NUMERIC=0
	while [ "$NUMERIC" != "1" ];do
		for (( x=$COUNT; x>=1; x--))
		do
			if [ $NUM == "$x" ];then
				NUMERIC=1
			fi
		done

		if [ "$NUMERIC" != "1" ];then
			echo -en "Invalid Movie Selected, Try Again (Enter 1 to ${COUNT}): "
			read NUM
		fi
	done

	movie_data $NUM
	echo
	old_IFS=$IFS 
	IFS=$'\n'
	
	 
	echo
}

# Main menu navigation
run_menu()
{
	i=-1
  while [ "$i" != "q" ]; do
		display_menu
		read i
		i=`echo $i | tr '[A-Z]' '[a-z]'`

		case "$i" in 
	  	"1")
			list_movies
			;;
		"2")
			select_seat
			;;
		"q")
			echo "GoodBye, Have A Nice Day"
			exit 0
			;;
		*)
			echo "Unrecognised Input."
			;;
		esac
  done
}


#----------------------------------------------#
# ---------PROGRAM SCRIPT START HERE---------- #
#----------------------------------------------#

if [ ! -f movielist.txt ]; then
  echo "Error: Movie list is not available"
fi


run_menu

1300 – 2Oct,The Social Network,No,Lido
1300 – 2Oct,The Town,No,Shaw,
1700 – 2Oct,Paranormal Activity 2,Yes,Cathay,
1900 – 2Oct,You Again,Yes,Lido,
2100 – 2Oct,Kamui,Yes,Shaw,

I want the result to be

Movie Title---------------ShowTime--------------Vacancy--------------Theatre Showing
Mission Impossible--------1500-1600-------------AVAILABLE ------------ Filmgarde

[atreyu]

again, i would use printf for this - much cleaner. also, provided you're using a recent version of Bash (and are specifying it at the top of the script, as in #!/bin/bash, and not #!/bin/sh), i'd recommend not mucking with IFS (for the same reasons) when there are other ways to do it, e.g.:

list_movies()
{
	# Called by run_menu
	
#	old_IFS=$IFS 
#	IFS=$'\n'
	print_movie_header
#	for LINE in `sed -e 's/Yes/Ticket Available/g' -e 's/No/SOLD OUT/g' movielist.txt`  
#	do
#echo "printing movie line '$LINE'"
#		print_movie $LINE
#	done
#  IFS=$old_IFS 
  while read line; do
    date=$(echo "$line"|awk -F, '{print $1}')
    title=$(echo "$line"|awk -F, '{print $2}')
    avail=$(echo "$line"|awk -F, '{print $3}')
    cine=$(echo "$line"|awk -F, '{print $4}')
    printf "%-26s%-14s%-13s%s\n" "$title" "$date" "$avail" "$cine"
  done < <(cat movielist.txt)
}

diddle with the numbers (26, 14, etc.) in the printf format to modify the justification of the columns.

[drl]

Hi.

This demonstrates automatic alignment of columns with perl script align on a surgically altered version of the script snippets:

#!/usr/bin/env bash

# @(#) s1	Demonstrate perl script "align".
# See: http://freecode.com/projects/align

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C align

print_movie_header()
{
  # echo -e '\E[1;32;40m'
  # if [ $# == "1" ];then
    # echo -n "   "
  # fi
  # echo -n -e 'Movie Title'
  # set_colwidth 'Movie Title' 25
  # echo -n -e 'Show Time\t'
  # if [ $# == "1" ];then
    # echo -n -e "\t"
  # fi
  # echo -n 'Vacancy\t'
  # set_colwidth 'Vacancy' 12
  # echo -n  'Cinema Showing'
  # echo -e '\E[0m'
  echo -e "Movie Title\tShow Time\tVacancy\tCinema SHowing"
}


list_movies()
{
  # Called by run_menu
  
  #	old_IFS=$IFS
  #	IFS=$'\n'
  print_movie_header
  # for LINE in `sed -e 's/Yes/Ticket Available/g' -e 's/No/SOLD OUT/g' movielist.txt`
  #	do
  #echo "printing movie line '$LINE'"
  #		print_movie $LINE
  #	done
  #  IFS=$old_IFS
  while read line; do
    date=$(echo "$line"|awk -F, '{print $1}')
    title=$(echo "$line"|awk -F, '{print $2}')
    avail=$(echo "$line"|awk -F, '{print $3}')
    cine=$(echo "$line"|awk -F, '{print $4}')
    # printf "%-26s%-14s%-13s%s\n" "$title" "$date" "$avail" "$cine"
    printf "%s\t" "$title" "$date" "$avail" "$cine"
    printf "\n"
  done < <(cat movielist.txt)
}

FILE=${1-data1}

pl " Input data file $FILE:"
cat $FILE

cp $FILE movielist.txt

pl " Results:"
list_movies |
tee f1 |
align -st

exit 0

producing:

% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0.8 (lenny) 
bash GNU bash 3.2.39
align 1.7.0

-----
 Input data file data1:
1300 – 2Oct,The Social Network,No
1300 – 2Oct,The Town,Yes
1700 – 2Oct,Paranormal Activity 2,Yes
1900 – 2Oct,You Again,Yes
2100 – 2Oct,Kamui,Yes

-----
 Results:
Movie Title		Show Time	Vacancy	Cinema SHowing
The Social Network	1300 – 2Oct	No
The Town		1300 – 2Oct	Yes
Paranormal Activity 2	1700 – 2Oct	Yes
You Again		1900 – 2Oct	Yes
Kamui			2100 – 2Oct	Yes

So to summarize, place a TAB between all fields of importance and run through align -st. See file f1 for raw input to align in this script.

See comment in scipt for link to align source.

Best wishes ... cheers, drl