bds

bash
#!/bin/bash
cat abc.txt | grep -o 'b\|c\|d\|f\|g\|h\|j\|k\|l\|m\|n\|p\|q\|r\|s\|t\|v\|w\|x\|y\|z\|B\|C\|D\|F\|G\|H\|J\|K\|L\|M\|N\|P\|Q\|R\|S\|T\|V\|W\|X\|Y\|Z' > b.txt
for a in `cat b.txt`
do
	s=$(($s + 1))
done
echo $s

#!/bin/bash
for a in `cat exam2.txt`
do
	s=$(($s + $a))
done
wc -w < exam2.txt > a.txt
for b in `cat a.txt`
do 
	n=$b
done
echo $((s/n))

#!/bin/bash
read n
for((a=0;a<$n;a++))
do
	for((b=0;b<n-a;b++))
	do
		echo -n ' '
	done	
	for((c=0;c<=a;c++))
	do
		echo -n '1 '
	done
	echo ' '
done

#!/bin/bash

for((i=1;i<=10;i++));
do
	mkdir dir$i
	cd dir$i
done

Dash
#!/bin/bash
echo -n "Enter number: "
read n
if [ $n -gt 20 ]
then
	echo "Please enter a number between 0 and 20"
	exit
fi
if [ $n -lt 0 ]
then
	echo "Please enter a number between 0 and 20"
	exit
fi
if [ $n -eq 0 ]
then
	echo "Factorial is 0"
	exit
fi
x=1
g=1
while [ $n -gt $g ]  
do
	x=`expr $x \* $n`
	n=`expr $n - 1`
done
echo "Factorial is $x"

#!/bin/sh
echo -n "Enter number: "
read n
if [ $n -lt 0 ]
then
	echo "Please enter a postive number"
	exit
fi
temp=0
while [ $n -gt 0 ]
do
    r=`expr $n % 10`
    if [ $r -gt $temp ]
	then
    	temp=`expr $r`
    fi
    n=`expr $n / 10`
done
echo  "Largest Digit is $temp"

#!/bin/sh
num(){
	j=`expr $1`
	if [ `expr $j % 3` -eq 0 ]
		then
		if [ `expr $j % 5` -ne 0 ]
		then
		echo "$j"
		fi
	fi
}
echo -n 'Enter starting point: '
read s
if [ $s -lt 0 ]
then
	echo "Please enter a postive number"
	exit
fi
echo -n 'Enter ending point: '
read e
if [ $e -lt $s ]
then
	echo "Please enter a number greater than the start"
	exit
fi
echo "List of numbers that are divisible by 3 but not 5 are: "
for i in `seq $s $e`
do
	num ${i}
done

#!/bin/sh
#This works irrespective of case
#To work with respect to case, hash out the fourth and sixth line and unhash the fifth
echo "Enter a String: "
read p
#read pos
pos=$(echo ${p} | tr "[:upper:]" "[:lower:]")
opp=$(echo $pos | rev)
#echo "possible palindrome: $pos      opposite: $opp"
if [ "$pos" = "$opp" ]
then
	echo "Palindrome"
	exit
else
	echo "Not a Palindrome"
	exit
fi

AWK
BEGIN {
	print "Circumference and Area Code"
	print "Press Ctrl-D to exit at any time"
	print "Return to Start" 	
}
{
	printf "Enter radius: "
	getline r
	a=3.14*r*r
	b=2*3.14*r
	print "Area = "a
	print "Circumference = "b
	print "Press Ctrl-D to exit, Return to try again"
}
END {
	print ""
	print "------End of Code------"
}

BEGIN {
	print "Even Odd Code"
	print "Press Ctrl-D to exit at any time"
	print "Return to Start" 
}
{
	flg=0
	printf "Start: "
	getline a
	printf "End: "
	getline b
	even=0
	odd=0
	for (i=a; i<=b; ++i)
		if((i%2)==0)
		{
			flg=1
			even=even+i
		}
		else
		{
			flg=1
			odd=odd+i
		}
	if(flg==1)
	{
		print "Sum of Even: " even
		print "Sum of Odd: " odd
		print "Ctrl-D to exit, Return to try again"
	}
	else if(flg==0)
	{
		print "Please make sure the second number is greater than the first and that all numbers are positive"
		print "Ctrl-D to exit, Return to try again"
	}
	
}
END {
	print ""
	print "------End of Code------"
}

#usage: awk -f q2.awk nums.txt
BEGIN {
	print "Even Odd Code"
	#print "Press Ctrl-D to exit at any time"
	#print "Return to Start" 
	print""
}
{
	a=$1
	b=$2
	#flg=0
	#printf "Start: "
	#getline a
	#printf "End: "
	#getline b
	if(a>b)
	{
		tmp = a
		a = b
		b = tmp
	}
	even=0
	odd=0
	for (i=a; i<=b; ++i)
		if((i%2)==0)
		{
			#flg=1
			even=even+i
		}
		else
		{
			#flg=1
			odd=odd+i
		}
	print "Sum of Even: " even
	print "Sum of Odd: " odd
	print "Ctrl-D to exit, Return to try again"
}
END {
	print ""
	print "------End of Code------"
}

#usage: awk -f q2.awk a.txt
BEGIN{
	print "Word Frequency Code"
	print ""
	j = 0
}
{
	for(i=1;i<=NF;i++)
	{
		if(arr[$i]++==0)
		{
     			count[++a]=$i;
		}
	}

}
END{
	for(i=0;i<=a;i++)
	{
		for(j=i+1;j<=a;j++)
		{
			if(arr[count[i]]<arr[count[j]])
			{
				temp=count[i];
				count[i]=count[j];
				count[j]=temp;
			}
		}
	}
	for (i=0;i<a;i++)
	{
		printf count[i]
		printf " :"
		printf arr[count[i]]
		print ""
	}
	print ""
	print "------End of Code------"
}

BEGIN{
	print "Palindrome Code ()"
	print "Press Ctrl-D to exit at any point"
	print "Return to Begin"
}
{
	printf "Enter a String: "
	getline str;
	str=toupper(str)
	n=split(str,hel,"");
	flg=0
	for(i in hel) 
	{ 
		rev=length(str)-i+1
		if(rev<1)
		{
			flg=2
		}
		if(hel[i] != hel[rev])
		{
			flg=1
			break
		}
	}
	if(flg==0)  
	print "String is a Palindrome " ; 
	else
	if(flg==2)
	print "Please enter a string" 
	else  
	print "String is not a Palindrome" ;
	print "Ctrl-D to exit and Return to try again"
}
END{
	print ""	
	print "------End of Code------"
}