12-19-2007
Extracting a substring starting from last occurance of a string/character
Hi All,
This is Ram. I'm new to this forum & new to shell scripts as well. I've a requirement in which I want to extract a substring from a given string based on last occurance of a character.
for eg.
I have a string of a file name with absolute path like
$filename=/aaa/bbb/ccc/ddd/xyz.txt
I want to extract only the actual file name ie, xyz.txt
The no. of directories ie, / will be dynamic. So I want to find the last occurance of / in the given string & to extract the string after the last /
can I have some ideas / suggestions please.
Thanks ,
Ram.
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strfind(3GEN) String Pattern-Matching Library Functions strfind(3GEN)
NAME
strfind, strrspn, strtrns, str - string manipulations
SYNOPSIS
cc [ flag ... ] file ... -lgen [ library ... ]
#include <libgen.h>
int strfind(const char *as1, const char *as2);
char *strrspn(const char *string, const char *tc);
char * strtrns(const char *string, const char *old, const char *new, char *result);
DESCRIPTION
The strfind() function returns the offset of the first occurrence of the second string, as2, if it is a substring of string as1. If the
second string is not a substring of the first string strfind() returns -1.
The strrspn() function trims chartacters from a string. It searches from the end of string for the first character that is not contained in
tc. If such a character is found, strrspn() returns a pointer to the next character; otherwise, it returns a pointer to string.
The strtrns() function transforms string and copies it into result. Any character that appears in old is replaced with the character
in the same position in new. The new result is returned.
USAGE
When compiling multithreaded applications, the _REENTRANT flag must be defined on the compile line. This flag should only be used in mul-
tithreaded applications.
EXAMPLES
Example 1: An example of the strfind() function.
/* find offset to substring "hello" within as1 */
i = strfind(as1, "hello");
/* trim junk from end of string */
s2 = strrspn(s1, "*?#$%");
*s2 = '