Match substring from a column of the second file

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LEARN ABOUT PLAN9

memmem

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

NAME

       memmem - locate a substring

SYNOPSIS

       #define _GNU_SOURCE	   /* See feature_test_macros(7) */
       #include <string.h>

       void *memmem(const void *haystack, size_t haystacklen,
		    const void *needle, size_t needlelen);

DESCRIPTION

       The  memmem()  function	finds the start of the first occurrence of the substring needle of length needlelen in the memory area haystack of
       length haystacklen.

RETURN VALUE

       The memmem() function returns a pointer to the beginning of the substring, or NULL if the substring is not found.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +----------+---------------+---------+
       |Interface | Attribute	  | Value   |
       +----------+---------------+---------+
       |memmem()  | Thread safety | MT-Safe |
       +----------+---------------+---------+
CONFORMING TO

       This function is not specified in POSIX.1, but is present on a number of other systems.

BUGS

       In glibc 2.0, if needle is empty, memmem() returns a pointer to the last byte of haystack.  This is fixed in glibc 2.1.

SEE ALSO

       bstring(3), strstr(3)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU
								    2017-03-13								 MEMMEM(3)

Shell Programming and Scripting