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 nl_langinfo(3) -- query language and locale information
    The nl_langinfo function provides access to locale information in a more flexible way than localeconv(3) does. Individual and additional elements of the locale categories can be queried. Examples for ...
 on_exit(3) -- register a function to be called at normal program termination.
    The on_exit() function registers the given function to be called at normal program termination, whether via exit(3) or via return from the program's main. The function is passed the argument to exit(...
 opendir(3) -- open a directory
    The opendir() function opens a directory stream corresponding to the directory name, and returns a pointer to the directory stream. The stream is positioned at the first entry in the directory.
 perror(3) -- print a system error message
    The routine perror() produces a message on the standard error output, describing the last error encountered during a call to a system or library function. The argument string s is printed first, then ...
 popen(3) -- process I/O
    The popen() function opens a process by creating a pipe, forking, and invoking the shell. Since a pipe is by definition unidirectional, the type argument may specify only reading or writing, not both;...
 printf(3) -- formatted output conversion
    The functions in the printf family produce output according to a format as described below. The functions printf and vprintf write output to stdout, the standard output stream; fprintf and vfprintf wr...
 profil(3) -- execution time profile
    This routine provides a means to find out in what areas your program spends most of its time. The argument buf points to bufsiz bytes of core. Every virtual 10 milliseconds, the user's program counte...
 psignal(3) -- print signal message
    The psignal() function displays a message on stderr consisting of the string s, a colon, a space, and a string describing the signal number sig. If sig is invalid, the message displayed will indicate ...
 putenv(3) -- change or add an environment variable
    The putenv() function adds or changes the value of environment variables. The argument string is of the form name=value. If name does not already exist in the environment, then string is added to the ...
 putpwent(3) -- write a password file entry
    The putpwent() function writes a password entry from the structure p in the file associated with stream. The passwd structure is defined in as follows: struct passwd { char *pw_name; /* user n...
 puts(3) -- output of characters and strings
    fputc() writes the character c, cast to an unsigned char, to stream. fputs() writes the string s to stream, without its trailing '\0'. putc() is equivalent to fputc() except that it may be implemen...
 putwchar(3) -- write a wide character to standard output
    The putwchar function is the wide-character equivalent of the putchar function. It writes the wide character wc to stdout. If ferror(stdout) becomes true, it returns WEOF. If a wide character conversi...
 qsort(3) -- sorts an array
    The qsort() function sorts an array with nmemb elements of size size. The base argument points to the start of the array. The contents of the array are sorted in ascending order according to a compari...
 raise(3) -- send a signal to the current process
    The raise function sends a signal to the current process. It is equivalent to kill(getpid(),sig)
 rand(3) -- random number generator.
    The rand() function returns a pseudo-random integer between 0 and RAND_MAX. The srand() function sets its argument as the seed for a new sequence of pseudo-random integers to be returned by rand(). Th...
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