Shell script to parse/split input string and display the tokens

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strtok_r

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

NAME

       strtok, strtok_r - extract tokens from strings

SYNOPSIS

       #include <string.h>

       char *strtok(char *s, const char *delim);

       char *strtok_r(char *s, const char *delim, char **ptrptr);

DESCRIPTION

       A `token' is a nonempty string of characters not occurring in the string delim, followed by  or by a character occurring in delim.

       The strtok() function can be used to parse the string s into tokens. The first call to strtok() should have s as its first argument. Subse-
       quent calls should have the first argument set to NULL. Each call returns a pointer to the next token, or NULL  when  no  more  tokens  are
       found.

       If  a  token ends with a delimiter, this delimiting character is overwritten with a  and a pointer to the next character is saved for the
       next call to strtok().  The delimiter string delim may be different for each call.

       The strtok_r() function is a reentrant version of the strtok() function, which instead of using its own static buffer, requires	a  pointer
       to a user allocated char*. This pointer, the ptrptr parameter, must be the same while parsing the same string.

BUGS

       Never use these functions. If you do, note that:

	      These functions modify their first argument.

	      These functions cannot be used on constant strings.

	      The identity of the delimiting character is lost.

	      The strtok() function uses a static buffer while parsing, so it's not thread safe. Use strtok_r() if this matters to you.

RETURN VALUE

       The strtok() function returns a pointer to the next token, or NULL if there are no more tokens.

CONFORMING TO

       strtok()
	      SVID 3, POSIX, BSD 4.3, ISO 9899

       strtok_r()
	      POSIX.1c

SEE ALSO

       index(3), memchr(3), rindex(3), strchr(3), strpbrk(3), strsep(3), strspn(3), strstr(3)

GNU
								    2000-02-13								 STRTOK(3)

Shell Programming and Scripting