abort(3) abort: generate a fault. abs(3) abs: integer absolute value. assert(3x) assert: program verification. atof(3) atof, atoi, atol: convert ASCII to numbers. crypt(3) crypt, setkey, encrypt: DES encryption. ctime(3) ctime, localtime, gmtime, asctime, timezone: convert date and time to ASCII. ctype(3) isalpha, isupper, islower, isdigit, isalnum, isspace, ispunct, isprint, iscntrl, isascii: character classification. dbm(3x) dbminit, fetch, store, delete, firstkey, nextkey: data base subroutines. ecvt(3) ecvt, fcvt, gcvt: output conversion. end(3) end, etext, edata: last locations in program. exp(3m) exp, log, log10, pow, sqrt: exponential, logarithm, power, square root. fclose(3s) fclose, fflush: close or flush a stream. ferror(3s) feof, ferror, clearerr, fileno: stream status inquiries. floor(3m) fabs, floor, ceil: absolute value, floor, ceiling functions. fopen(3s) fopen, freopen, fdopen: open a stream. fread(3s) fread, fwrite: buffered binary input/output. frexp(3) frexp, ldexp, modf: split into mantissa and exponent. fseek(3s) fseek, ftell, rewind: reposition a stream. gamma(3m) gamma: log gamma function. getarg(3f) getarg, iargc: command arguments to Fortran. getc(3s) getc, getchar, fgetc, getw: get character or word from stream. getenv(3) getenv: value for environment name. getgrent(3) getgrent, getgrgid, getgrnam, setgrent, endgrent: get group file entry. getlogin(3) getlogin: get login name. getpass(3) getpass: read a password. getpw(3) getpw: get name from UID. getpwent(3) getpwent, getpwuid, getpwnam, setpwent, endpwent: get password file entry. gets(3s) gets, fgets: get a string from a stream. hypot(3m) hypot, cabs: euclidean distance. intro(3) intro: introduction to library functions. j0(3m) j0, j1, jn, y0, y1, yn: bessel functions. l3tol(3) l3tol, ltol3: convert between 3-byte integers and long integers. malloc(3) malloc, free, realloc, calloc: main memory allocator. mktemp(3) mktemp: make a unique file name. monitor(3) monitor: prepare execution profile. nlist(3) nlist: get entries from name list. perror(3) perror, sys_errlist, sys_nerr: system error messages. plot(3x) plot: openpl et al.: graphics interface. popen(3s) popen, pclose: initiate I/O to/from a process. printf(3s) printf, fprintf, sprintf: formatted output conversion. putc(3s) putc, putchar, fputc, putw: put character or word on a stream. puts(3s) puts, fputs: put a string on a stream. qsort(3) qsort: quicker sort. rand(3) rand, srand: random number generator. scanf(3s) scanf, fscanf, sscanf: formatted input conversion. setbuf(3s) setbuf: assign buffering to a stream. setjmp(3) setjmp, longjmp: non-local goto. sin(3m) sin, cos, tan, asin, acos, atan, atan2: trigonometric functions. sinh(3m) sinh, cosh, tanh: hyperbolic functions. sleep(3) sleep: suspend execution for interval. stdio(3s) stdio: standard buffered input/output package. string(3) strcat, strcatn, strcmp, strcmpn, strcpy, strcpyn, strlen, index, rindex: string operations. swab(3) swab: swap bytes. system(3) system: issue a shell command. ttyname(3) ttyname, isatty, ttyslot: find name of a terminal. ungetc(3s) ungetc: push character back into input stream.