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Top Forums UNIX for Dummies Questions & Answers Script batch with command sed Post 302867831 by yo-yo78 on Friday 25th of October 2013 05:42:00 AM
Old 10-25-2013
the substrig is the first n characters

the string of files is every different and contain 1 line but different length
 

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STRSPN(3)						     Linux Programmer's Manual							 STRSPN(3)

NAME
strspn, strcspn - search a string for a set of characters SYNOPSIS
#include <string.h> size_t strspn(const char *s, const char *accept); size_t strcspn(const char *s, const char *reject); DESCRIPTION
The strspn() function calculates the length of the initial segment of s which consists entirely of characters in accept. The strcspn() function calculates the length of the initial segment of s which consists entirely of characters not in reject. RETURN VALUE
The strspn() function returns the number of characters in the initial segment of s which consist only of characters from accept. The strcspn() function returns the number of characters in the initial segment of s which are not in the string reject. CONFORMING TO
SVID 3, POSIX, BSD 4.3, ISO 9899 SEE ALSO
index(3), memchr(3), rindex(3), strchr(3), strpbrk(3), strsep(3), strstr(3), strtok(3) 1993-04-12 STRSPN(3)
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