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Top Forums UNIX for Dummies Questions & Answers Extracting numbers from a String Post 302421110 by ah7391 on Thursday 13th of May 2010 11:41:37 AM
Old 05-13-2010
Extracting numbers from a String

Hi all,

I'm a new programmer to shell script... and I have no idea how to use substring.

I want to extract the numbers from the following string and place it into a variable:
"170 unique conformations found"

The numbers can be more than three digits depending on the case. I just want to ensure that I can isolate ALL the numbers in this string for every case (no matter how many digits there are). In other words, the programming should not depend on the number of digits of the number.

Thanks! Much appreciated by me and our laboratory at University of Richmond!!
 

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Tk_GetUid(3TK)						       Tk Library Procedures						    Tk_GetUid(3TK)

__________________________________________________________________________________________________________________________________________________

NAME
Tk_GetUid, Tk_Uid - convert from string to unique identifier SYNOPSIS
#include <tk.h> Tk_Uid Tk_GetUid(string) ARGUMENTS
char *string (in) String for which the corresponding unique identifier is desired. _________________________________________________________________ DESCRIPTION
Tk_GetUid returns the unique identifier corresponding to string. Unique identifiers are similar to atoms in Lisp, and are used in Tk to speed up comparisons and searches. A unique identifier (type Tk_Uid) is a string pointer and may be used anywhere that a variable of type ``char *'' could be used. However, there is guaranteed to be exactly one unique identifier for any given string value. If Tk_GetUid is called twice, once with string a and once with string b, and if a and b have the same string value (strcmp(a, b) == 0), then Tk_GetUid will return exactly the same Tk_Uid value for each call (Tk_GetUid(a) == Tk_GetUid(b)). This means that variables of type Tk_Uid may be com- pared directly (x == y) without having to call strcmp. In addition, the return value from Tk_GetUid will have the same string value as its argument (strcmp(Tk_GetUid(a), a) == 0). KEYWORDS
atom, unique identifier ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWTk | +--------------------+-----------------+ |Interface Stability | Uncommitted | +--------------------+-----------------+ NOTES
Source for Tk is available on http://opensolaris.org. Tk Tk_GetUid(3TK)
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