Shell Programming and Scripting

#!/bin/sh
#Get a string from user and check whether its a existing filename or not
rm str2
rm str3
echo "enter a file \c"
read fil
#echo $fil
grep $fil fl >> str2 #fl has all filename stored in it using ls -l >> fl
cut -c 1-1 str2 >> str3
cat str2
cat str3 #it has the value '-'
case "$str3" in
-) echo "you have entered a filename" ;;
*) echo "not a filename"
exit ;;
esac

case "$str3" in

str3=$(head -1 str3)

read "enter a file: "?fil
not_first="${fil#?}"              # Trim off first character from input
first="${fil%$notfirst}"          # Trim off all the other characters from input

case "$first" in.......

#!/bin/sh
# Get a word from user and check whether a filename or directory exists in the same name

echo "enter a name \c"
read name

# if its a file, var_1 will have 0
var_1=`[ -f $name ];echo $?`

# if its a directory, var_2 will have 1
var_2=`[ -d $name ];echo $?`

    if [ $var_1 -eq 0  -a $var_2 -eq 1 ]
       then
         echo "Given name has both file and dir"

     elif [ $var_1 -eq 0 -a $var_2 -ne 1 ]
      then
         echo "Given name is a file"
    elif [ $var_2 -eq 1 -a $var_1 -ne 0 ]
      then
         echo "Given name is a directory"
    else
         echo "neither a file nor a dir"
fi

#!/bin/sh
# My system has /bin/sh --> bin/bash, but should be posix compliant

printf "Enter a filename: "
read FN

# List items starting with entered FN, and expand it to a list
# If 'ls' fails, exit with message and error code
str=$(ls ${FN}* 2>/dev/null) || { echo "No entry $FN found!" ; exit 1 ; }

for F in $str
do
	if [ -L "$F" ]
	then	echo "$F is a link"
	elif [ -d "$F" ]
	then	echo "$F is a directory"
	elif [ -f "$F" ]
	then	echo "$F is a file"
	else	# This should never be printed, as its reading the existing content
		echo "No item $F found!"
	fi
done