[semanticc]

The only problem with `apropos` is that it returns so many irrelevant results:

  $ apropos 'count lines' | wc -l
     167

  $ apropos 'count lines' | head
  AllPlanes(3), BlackPixel(3), WhitePixel(3), ConnectionNumber(3), DefaultColormap(3), DefaultDepth(3), XListDepths(3), DefaultGC(3), DefaultRootWindow(3), DefaultScreenOfDisplay(3), DefaultScreen(3), DefaultVisual(3), DisplayCells(3), DisplayPlanes(3), DisplayString(3), XMaxRequestSize(3), XExtendedMaxRequestSize(3), LastKnownRequestProcessed(3), NextRequest(3), ProtocolVersion(3), ProtocolRevision(3), QLength(3), RootWindow(3), ScreenCount(3), ScreenOfDisplay(3), ServerVendor(3), VendorRelease(3) - Display macros and functions
  EVP_PKEY_asn1_find(3ssl), EVP_PKEY_asn1_find_str(3ssl), EVP_PKEY_asn1_get_count(3ssl), EVP_PKEY_asn1_get0(3ssl), EVP_PKEY_asn1_get0_info(3ssl) - enumerate public key ASN.1 methods
  EVP_PKEY_meth_get_count(3ssl), EVP_PKEY_meth_get0(3ssl), EVP_PKEY_meth_get0_info(3ssl) - enumerate public key methods
  OCSP_REQUEST_new(3ssl), OCSP_REQUEST_free(3ssl), OCSP_request_add0_id(3ssl), OCSP_request_sign(3ssl), OCSP_request_add1_cert(3ssl), OCSP_request_onereq_count(3ssl), OCSP_request_onereq_get0(3ssl) - OCSP request functions
  OCSP_resp_find_status(3ssl), OCSP_resp_count(3ssl), OCSP_resp_get0(3ssl), OCSP_resp_find(3ssl), OCSP_single_get0_status(3ssl), OCSP_resp_get0_produced_at(3ssl), OCSP_resp_get0_signature(3ssl), OCSP_resp_get0_tbs_sigalg(3ssl), OCSP_resp_get0_respdata(3ssl), OCSP_resp_get0_certs(3ssl), OCSP_resp_get0_signer(3ssl), OCSP_resp_get0_id(3ssl), OCSP_resp_get1_id(3ssl), OCSP_check_validity(3ssl), OCSP_basic_verify(3ssl) - OCSP response utility functions
  OPENSSL_malloc_init(3ssl), OPENSSL_malloc(3ssl), OPENSSL_zalloc(3ssl), OPENSSL_realloc(3ssl), OPENSSL_free(3ssl), OPENSSL_clear_realloc(3ssl), OPENSSL_clear_free(3ssl), OPENSSL_cleanse(3ssl), CRYPTO_malloc(3ssl), CRYPTO_zalloc(3ssl), CRYPTO_realloc(3ssl), CRYPTO_free(3ssl), OPENSSL_strdup(3ssl), OPENSSL_strndup(3ssl), OPENSSL_memdup(3ssl), OPENSSL_strlcpy(3ssl), OPENSSL_strlcat(3ssl), CRYPTO_strdup(3ssl), CRYPTO_strndup(3ssl), OPENSSL_mem_debug_push(3ssl), OPENSSL_mem_debug_pop(3ssl), CRYPTO_mem_debug_push(3ssl), CRYPTO_mem_debug_pop(3ssl), CRYPTO_clear_realloc(3ssl), CRYPTO_clear_free(3ssl), CRYPTO_malloc_fn(3ssl), CRYPTO_realloc_fn(3ssl), CRYPTO_free_fn(3ssl), CRYPTO_get_mem_functions(3ssl), CRYPTO_set_mem_functions(3ssl), CRYPTO_get_alloc_counts(3ssl), CRYPTO_set_mem_debug(3ssl), CRYPTO_mem_ctrl(3ssl), CRYPTO_mem_leaks(3ssl), CRYPTO_mem_leaks_fp(3ssl), CRYPTO_mem_leaks_cb(3ssl), OPENSSL_MALLOC_FAILURES(3ssl), OPENSSL_MALLOC_FD(3ssl) - Memory allocation functions
  PKCS5_PBKDF2_HMAC(3ssl), PKCS5_PBKDF2_HMAC_SHA1(3ssl) - password based derivation routines with salt and iteration count
  RSA_set0_key(3ssl), RSA_set0_factors(3ssl), RSA_set0_crt_params(3ssl), RSA_get0_key(3ssl), RSA_get0_factors(3ssl), RSA_get0_crt_params(3ssl), RSA_get0_n(3ssl), RSA_get0_e(3ssl), RSA_get0_d(3ssl), RSA_get0_p(3ssl), RSA_get0_q(3ssl), RSA_get0_dmp1(3ssl), RSA_get0_dmq1(3ssl), RSA_get0_iqmp(3ssl), RSA_get0_pss_params(3ssl), RSA_clear_flags(3ssl), RSA_test_flags(3ssl), RSA_set_flags(3ssl), RSA_get0_engine(3ssl), RSA_get_multi_prime_extra_count(3ssl), RSA_get0_multi_prime_factors(3ssl), RSA_get0_multi_prime_crt_params(3ssl), RSA_set0_multi_prime_params(3ssl), RSA_get_version(3ssl) - Routines for getting and setting data in an RSA object
  TIFFFieldPassCount(3tiff) - get whether to pass a count to TIFFGetField/TIFFSetField
  TIFFFieldReadCount(3tiff) - get number of values to be read from field

[fellerts]

Well, staple utilities typically have short names, so sorting the results by name length might help:

    $ apropos count lines | awk '{print length($1), $0}' | sort -n | head
    2 gc (1)               - count graph components
    2 nl (1)               - number lines of files
    2 rg (1)               - recursively search the current directory for lines matching a pattern
    2 sa (8)               - summarizes accounting information
    2 wc (1)               - print newline, word, and byte counts for each file
    3 box (3x)             - create curses borders, horizontal and vertical lines
    3 cvt (1)              - calculate VESA CVT mode lines
    3 gtf (1)              - calculate VESA GTF mode lines
    3 rev (1)              - reverse lines characterwise
    3 sum (1)              - checksum and count the blocks in a file

Side-note, there are a bunch of neat utilities here I didn't know about!