Home

2014-01-20 Shell scripts Supporting tagline

20 January 2014

The following scripts are all of bash scripts, and test passed on ubuntu12.04.

to sort a file with text block format

#!/bin/bash
# To sort a file content according to the first line of each text block, two text blocks listed as below:
#bb
#22
#two,two
#
#aa
#11
#one,one
#
# Author: lst
# Date: 2013-12-23
echo "Input file $1 content:"
cat $1 
echo "Output file $2 content:"

cat $1 | awk -v RS="" '{gsub("\n","@");print}'|sort|awk -v ORS="\n\n" '{gsub("@","\n");print}' |tee $2

9 multiple 9

#!/bin/bash
for (( i=1;i<=9;i++ ))
do
	for (( j=1;j<=i;j++ ))
	do
		let "tmp = i * j"
		echo -n "$j*$i=$tmp "
	done
	echo ""
done

select color

#!/bin/bash
echo "What's your favorite color ?"
PS3="Please input select number : "
TMOUT=5
select color in "Red" "Green" "Blue"
do
	break
done
if [ -z "$color" ]
then
	echo "Your selected nothing!"
else
	echo "Your selected $color"
fi

run seconds

#!/bin/bash
echo $SECONDS
sleep 10
echo $SECONDS

timed read

#!/bin/bash
echo "What's your name?"
TMOUT=5
read name
if [ -z "$name" ]
then
	name="(no answer)"
fi

echo "Hello, $name"

html converter

#!/bin/bash
# author: lst
# date: 2014-01-18
cat << MAY
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML>
<HEAD>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>
Transform TEXT file to HTML file
</TITLE>
</HEAD>
<BODY>
<TABLE>
MAY

sed -e 's/:/<\/TD><TD>/g' -e 's/^/<TR><TD>/g' -e 's//<\/TD><\/TR>/g'

cat << MAY
</TABLE>
</BODY>
</HTML>
MAY

top n

#!/bin/bash
# author: lst
# date: 2014-01-18

n=$1
cat $2 |
tr -cs "[a-z][A-Z]" "[\012*]" | # one word per line
tr A-Z a-z |                    # lowercase for each word
sort |                          
uniq -c |                       # count for each word
sort -k1nr -k2 |                # first order by count, then order by alphabetic 
head -n "$n"                    # output the first $n lines

verification code generator

#!/bin/bash
# author: lst
# date: 2014-01-18

len=6
i=1
all=(0 1 2 3 4 5 6 7 8 9 a b c d e f g h i j k l m n o p q r s t u v w x y z A B C D E F G H I J K L M N O P Q R S T U V W X Y Z)
n_all=${#all[@]}

while [ "$i" -le "$len" ]
do
	verifi_code[$i]=${all[$((RANDOM%n_all))]}
	let "i=i+1"
done

for j in ${verifi_code[@]}
do
	echo -n $j
done
echo

output ascii

#!/bin/bash
# author: lst
# date: 2014-01-18
echo "Please input the start of a range (decimal number):"
read first

echo "Please input the end of a range (decimal number):"
read last

echo "Decimal    Hex     Character"
echo "-------    ----    ---------"

for (( i=first; i <= last; i++ ))
do
	echo $i | awk '{printf("%3d        %2x      %c\n", $1, $1, $1)}'
done

stack simulator

#!/bin/bash
# author: lst
# date: 2014-01-18

MAXTOP=50
TOP=$MAXTOP
TMP=

declare -a STACK

push()
{
	if [ -z "$1" ]
	then
		return
	fi

	until [ $# -eq 0 ]
	do
		let TOP=TOP-1
		STACK[$TOP]=$1
		shift
	done

	return
}

pop()
{
	TMP=

	if [ "$TOP" -eq "$MAXTOP" ]
	then
		return
	fi

	TMP=${STACK[$TOP]}
	unset STACK[$TOP]
	let TOP=TOP+1

	return
}

status()
{
	echo "================Begin==================="
	for i in ${STACK[@]}
	do
		echo $i
	done
	echo

	echo "STACK pointer = $TOP"
	echo "Just popped: $TMP from the STACK"
	echo "=================End===================="

}

while :
do

	echo "Select operation type:"
	select action in "Push" "Pop" "Exit"
	do
		break
	done
	
	case $action in
		Push)
			echo "Input stack elements:"
			read node
			push $node
			status
			;;
		Pop)
			pop
			status
			;;
		Exit)
			echo "Bye bye !"
			exit 0
			;;
		*)
			echo "Invalid operation type!"
			exit 1;;
	esac
	
done
blog comments powered by Disqus