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Top Forums Shell Programming and Scripting How to check the user input to be valid using shell script? Post 302774443 by bakunin on Friday 1st of March 2013 11:22:19 PM
Old 03-02-2013
First, your input (obviously a filemode mask) has more structure: the "r" can only appear in the 1nd, 4th or 7th place, the "w" can only appear in the 2rd, 5th or 8th place, etc.

Construct a regular expression for this and compare the input string against this regexp:

Code:
typeset input=""

print - "Enter input string: " ; read input
if print - "$input" | grep -q '^[-r][-w][-x][-r][-w][-x][-r][-w][-x]$' ; then
     print - "input: $input \tstatus: OK"
else
     print - "input: $input \tstatus: Not OK"
fi

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
 

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STR_PAD(3)								 1								STR_PAD(3)

str_pad - Pad a string to a certain length with another string

SYNOPSIS
string str_pad (string $input, int $pad_length, [string $pad_string = " "], [int $pad_type = STR_PAD_RIGHT]) DESCRIPTION
This functions returns the $input string padded on the left, the right, or both sides to the specified padding length. If the optional argument $pad_string is not supplied, the $input is padded with spaces, otherwise it is padded with characters from $pad_string up to the limit. PARAMETERS
o $input - The input string. o $pad_length - If the value of $pad_length is negative, less than, or equal to the length of the input string, no padding takes place. o $pad_string - Note The $pad_string may be truncated if the required number of padding characters can't be evenly divided by the $pad_string's length. o $pad_type - Optional argument $pad_type can be STR_PAD_RIGHT, STR_PAD_LEFT, or STR_PAD_BOTH. If $pad_type is not specified it is assumed to be STR_PAD_RIGHT. RETURN VALUES
Returns the padded string. EXAMPLES
Example #1 str_pad(3) example <?php $input = "Alien"; echo str_pad($input, 10); // produces "Alien " echo str_pad($input, 10, "-=", STR_PAD_LEFT); // produces "-=-=-Alien" echo str_pad($input, 10, "_", STR_PAD_BOTH); // produces "__Alien___" echo str_pad($input, 6 , "___"); // produces "Alien_" ?> PHP Documentation Group STR_PAD(3)
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