Shell Programming and Scripting

 cat shell_script
 #!/usr/bin/ksh 
 input =$@
 echo "  we are inside the shell script"
 echo "  here are the input parameters"
 ..........................
 ..................
 ......................

./shell_script  " here is the string which you need to format"

echo"here is the string which you need to format" |shell_script

$ cat shell_script
#!/usr/bin/ksh

if [ $# -eq 0 ]
then
   if [ -t 0 ]
   then
      printf "Input: "
   fi
   read input
else
   input=$@
fi

echo "Input is: $input"
$ ./shell_script "one two" three
Input is: one two three
$ echo "piped one two" | ./shell_script
Input is: piped one two
$ ./shell_script
Input: prompted value
Input is: prompted value

if [ -t 0]

   if [ -t 0 ]
   then
      printf "Input: " >&2
   fi

ls x |output_log
x not found
[INFO][Dec 12 10:37:17]

]ls test_file | output_log
[INFO][Dec 12 10:47:10]  test_file