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Top Forums Shell Programming and Scripting How to change last character in string with a variable value. Post 302513531 by chagan02 on Wednesday 13th of April 2011 01:21:29 PM
Old 04-13-2011
How to change last character in string with a variable value.

Hey Guys,

I have text such as this.
Code:
28003,ALCORN,2
28009,BENTON,2
28013,CALHOUN,2
28017,CHICKASAW,2
47017,CARROLL,2
05021,CLAY,0


The last digit after the final "," is a variable value. This is the base file. I have to do further execution on this file later and I need to update the 3rd value at that time. So, How do I open this file, and append the last digit to my new variable, and also save as the same filename. I have tried multiple unsuccessful options.

An example of what I want is essentially the same output only with the new variable values appended. Using shell by the way.
Moderator's Comments:
Mod Comment
Please use code tags when posting data and code samples!

Last edited by vgersh99; 04-13-2011 at 02:36 PM.. Reason: code tags, please!
 

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setenv(3C)						   Standard C Library Functions 						setenv(3C)

NAME
setenv - add or change environment variable SYNOPSIS
#include <stdlib.h> int setenv(const char *envname, const char *envval, int overwrite); DESCRIPTION
The setenv() function updates or adds a variable in the environment of the calling process. The envname argument points to a string con- taining the name of an environment variable to be added or altered. The environment variable is set to the value to which envval points. The function fails if envname points to a string which contains an '=' character. If the environment variable named by envname already exists and the value of overwrite is non-zero, the function returns successfully and the environment is updated. If the environment vari- able named by envname already exists and the value of overwrite is zero, the function returns successfully and the environment remains unchanged. If the application modifies environ or the pointers to which it points, the behavior of setenv() is undefined. The setenv() function updates the list of pointers to which environ points. The strings described by envname and envval are copied by this function. RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, -1 is returned, errno set to indicate the error, and the environment is left unchanged. ERRORS
The setenv() function will fail if: EINVAL The envname argument is a null pointer, points to an empty string, or points to a string containing an '=' character. ENOMEM Insufficient memory was available to add a variable or its value to the environment. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
getenv(3C), unsetenv(3C), attributes(5), standards(5) SunOS 5.11 31 Mar 2002 setenv(3C)
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