Shell Programming and Scripting

I have a script which takes 4 input. Can I put these intput into file and read from there

I tried like that

scripts <input.txt

but did not work

any help

There may be many ways of doing this i'll describe just one & probably the easiest one.
Assuming that u r taking input from a fixed file 'input.txt' (whose content u might be changing when u have to pass different parameters). U can make a simple change in ur script. Just put this before u use the postional variables (i.e. $1,$2..etc)

Code:

set `cat input.txt`

A sample script can be

Code:

#!/bin/bash
set `cat input.txt`
echo $1 $2 $3 $4

Above script will just print the parameters (where parameters itself come from the file). If u intend to take the filename as argument then u can do something like this: set `cat $1`

One more thing i would just like to mention is that the redirection is a capability of the shell and the script or command invoked might not even know that anything like this happened. Many commands on Unix process the standard input if no argument is specified and there u can use ur redirection but this is no way same as passing parameter. Like sort or cat, sort or display file that is passed as argument but if no argument is passed standard input is sorted(by sort) or anything written on std. input is displayed back(by cat). So in effect
sort filename (or cat filename) and sort <filename (or cat <filename) are same but they performed in very different ways. Hope u get me. An excellent description of this can be found in Programming in Unix Enviroment by Brian.W.Kerninghan & Rob Pike.

Regards
Rakesh