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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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line(1) 						      General Commands Manual							   line(1)

NAME
line - Reads one line from standard input SYNOPSIS
line STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: line: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. OPTIONS
None DESCRIPTION
The line command copies one line, up to and including a newline, from standard input and writes it to standard output. Use this command within a shell command file to read from your terminal. The line command always writes at least a newline character. NOTES
The line utility has no internationalization features and is marked LEGACY in XCU Issue 5. Use the read utility instead. EXIT STATUS
Success. End-of-File. EXAMPLES
To read a line from the keyboard and append it to a file, enter: echo 'Enter comments for the log:' echo ': c' line >>log This shell procedure displays the message: Enter comments for the log: It then reads a line of text from the keyboard and adds it to the end of the file log. The echo ': c' command displays a : (colon) prompt. See the echo command for information about the c escape sequence. SEE ALSO
Commands: echo(1), ksh(1), read(1), Bourne shell sh(1b), POSIX shell sh(1p) Functions: read(2) Standards: standards(5) line(1)
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