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Unix Version 7 - man page for string (v7 section 3)

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STRING(3)										STRING(3)

       strcat,	strncat,  strcmp, strncmp, strcpy, strncpy, strlen, index, rindex - string opera-

       char *strcat(s1, s2)
       char *s1, *s2;

       char *strncat(s1, s2, n)
       char *s1, *s2;

       strcmp(s1, s2)
       char *s1, *s2;

       strncmp(s1, s2, n)
       char *s1, *s2;

       char *strcpy(s1, s2)
       char *s1, *s2;

       char *strncpy(s1, s2, n)
       char *s1, *s2;

       char *s;

       char *index(s, c)
       char *s, c;

       char *rindex(s, c)
       char *s;

       These functions operate on null-terminated strings.  They do not check for overflow of any
       receiving string.

       Strcat  appends	a  copy  of  string s2 to the end of string s1.  Strncat copies at most n
       characters.  Both return a pointer to the null-terminated result.

       Strcmp compares its arguments and returns an integer greater than, equal to, or less  than
       0,  according as s1 is lexicographically greater than, equal to, or less than s2.  Strncmp
       makes the same comparison but looks at at most n characters.

       Strcpy copies string s2 to s1, stopping after the null character has been moved.   Strncpy
       copies  exactly	n  characters, truncating or null-padding s2; the target may not be null-
       terminated if the length of s2 is n or more.  Both return s1.

       Strlen returns the number of non-null characters in s.

       Index (rindex) returns a pointer to the first (last) occurrence of character c  in  string
       s, or zero if c does not occur in  the string.

       Strcmp  uses  native  character	comparison, which is signed on PDP11's, unsigned on other

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