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Top Forums Shell Programming and Scripting Extracting a part of a string Post 302941216 by ChandanN on Tuesday 14th of April 2015 05:06:56 AM
Old 04-14-2015
Code Extracting a part of a string

Hi,

I needed to extract some specific characters from a string based on user input. For example: After the script executes the user enters the following details:
Code:
Please enter the string: This is a shell script
Please enter the starting position: 11
Please enter the number of characters to be extracted: 4
The output will be displayed as below
Output: shel

So I wrote a script as below:

Code:
!/bin/ksh

echo "Please enter the string: "
read str
echo "Please enter the starting position: "
read start_position
echo "Please enter the number of characters to be extracted: "
read char_num

output=`echo $str | cut -c $start_position-char_num`
echo "Output: "$output

But it is throwing error for incorrect usage of cut command. Can anyone please help me in completing the script?

Thanks in advance,
Chandan

Last edited by Scrutinizer; 04-14-2015 at 02:02 PM..
 

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WORDWRAP(3)								 1							       WORDWRAP(3)

wordwrap - Wraps a string to a given number of characters

SYNOPSIS
string wordwrap (string $str, [int $width = 75], [string $break = "0], [bool $cut = false]) DESCRIPTION
Wraps a string to a given number of characters using a string break character. PARAMETERS
o $str - The input string. o $width - The number of characters at which the string will be wrapped. o $break - The line is broken using the optional $break parameter. o $cut - If the $cut is set to TRUE, the string is always wrapped at or before the specified $width. So if you have a word that is larger than the given width, it is broken apart. (See second example). When FALSE the function does not split the word even if the $width is smaller than the word width. RETURN VALUES
Returns the given string wrapped at the specified length. EXAMPLES
Example #1 wordwrap(3) example <?php $text = "The quick brown fox jumped over the lazy dog."; $newtext = wordwrap($text, 20, "<br /> "); echo $newtext; ?> The above example will output: The quick brown fox<br /> jumped over the lazy<br /> dog. Example #2 wordwrap(3) example <?php $text = "A very long woooooooooooord."; $newtext = wordwrap($text, 8, " ", true); echo "$newtext "; ?> The above example will output: A very long wooooooo ooooord. Example #3 wordwrap(3) example <?php $text = "A very long woooooooooooooooooord. and something"; $newtext = wordwrap($text, 8, " ", false); echo "$newtext "; ?> The above example will output: A very long woooooooooooooooooord. and something SEE ALSO
nl2br(3), chunk_split(3). PHP Documentation Group WORDWRAP(3)
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