bash-4.2$ ./apropos "install new package"
pkg_add(1)  0.0226561164087622
...documentation, configurations, installation instructions and/or other files. pkg_add can recursively install other packages that...

pkg_delete(1)   0.0205713704006198
...delete packages that have been previously installed with the pkg_add 1 command. The given packages...

pkg_info(1) 0.0197136654802009
...installed package (with our without version), a pattern matching several installed packages (see the PACKAGE...

atf-version(1)  0.0192477789987012
...version of the ATF package installed in the system (the installation that corresponds to the...

pkgsrc(7)   0.0124793323984176
...to install readytouse packages and to perform various administrative tasks for the package...

bpm(1)  0.00983311007458239
...command is used to locate and install binary packages from any reachable URL. The following...

pkg_summary(5)  0.0050789721039844
...package does not require shared libraries. SIZE_PKG (required) The size of the package when installed...

pkg_install.conf(5) 0.00305032051899243
...binary packages or pkgvulnerabilities files. CHECK_LICENSE Check the license conditions of packages before installing...

tests(7)    0.000593733596198537
...the system (such as the installation of thirdparty packages or manual modifications to configuration...

compat_linux(8) 0.000447042465873695
...file. It is recommended that you install Linux packages that include configuration files, etc under...

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bash-4.2$ ./apropos "generate password hash"
pwhash(1)   0.0136171098621772
hashes passwords from the command line or standard...is automatically generated for each password. Specifying the...

pwd_mkdb(8) 0.00474371713112646
generate the password databases...megabytes used by the hashing library. On systems...

ssh-keygen(1)   0.000609628818209953
...mix hashed and nonhashed...W generator Specify desired generator...to a password, except it...

skey(1) 0.000486753741997048
...your secret password. Running skey then generates the...hash algorithm is selected using the t hash...

ssh_config(5)   9.85468720766591e-05
...file, and general defaults at...yes , passphrase/password querying will...1 should hash host names...

ftp(1)  8.6907974347586e-05
...mode). hash size Toggle hash...for a password and an...place. The generated unique filename...

intro(3)    2.63719299571683e-05
...encryption and hash routines see...library provides generic editing and...onetime password library.  See...

racoon.conf(5)  1.40726595881397e-05
...and validating passwords against system...private key generated by plainrsa...Defines the hash algorithm used...

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bash-4.2$ ./apropos "function to traverse directories"
ftw,(3) 6.05520452370178e-05
...the fts 3 functions. The ftw and nftw functions traverse (walk) the directory hierarchy rooted...

archive_read_finish(3)  5.65680335093368e-05
...operation. (For example, directory traversal libraries often provide...cleanup function for that data. The cleanup function...

krb5_kuserok(3) 2.88347488062668e-05
...are not traversed. Note that this directory may...This function takes the name of a local...

fts_close(3)    2.74030290237656e-05
The fts_close functions are provided for traversing file...a directory in the hierarchy. In general, directories...

options(4)  1.06388555280773e-06
...kernel source directory. Failure to...address, channel, function, offset, and...with @ when traversing symbolic links...