➜ workplace man -k zip zip: nothing appropriate.
出现这种情况，是索引库没有建立。
man 和 whatis 共用一个索引库的。
我们使用 man whatis 进行查看：
index databases are used during the search, and are updated by the mandb pro‐
gram. Depending on your installation, this may be run by a periodic cron job,
or may need to be run manually after new manual pages have been installed. To
produce an old style text whatis database from the relative index database,
issue the command:
所以进行执行 mandb 就行了。 老版本的 linux 需要执行： /usr/sbin/makewhatis
这些命令都是在 root 模式下执行。执行后我们重新查看：
➜ ~ man -k zip bunzip2 (1) - a block-sorting file compressor, v1.0.6 bzcmp (1) - compare bzip2 compressed files bzdiff (1) - compare bzip2 compressed files bzegrep (1) - search possibly bzip2 compressed files for a regular expression bzfgrep (1) - search possibly bzip2 compressed files for a regular expression bzgrep (1) - search possibly bzip2 compressed files for a regular expression bzip2 (1) - a block-sorting file compressor, v1.0.6 bzip2recover (1) - recovers data from damaged bzip2 files bzless (1) - file perusal filter for crt viewing of bzip2 compressed text bzmore (1) - file perusal filter for crt viewing of bzip2 compressed text funzip (1) - filter for extracting from a ZIP archive in a pipe gpg-zip (1) - Encrypt or sign files into an archive grubby (8) - command line tool for configuring grub, lilo, elilo, yaboot and ... gunzip (1) - compress or expand files gzip (1) - compress or expand files mzip (1) - change protection mode and eject disk on Zip/Jaz drive prezip-bin (1) - prefix zip delta word list compressor/decompressor unzip (1) - list, test and extract compressed files in a ZIP archive unzipsfx (1) - self-extracting stub for prepending to ZIP archives zforce (1) - force a '.gz' extension on all gzip files zip (1) - package and compress (archive) files zipcloak (1) - encrypt entries in a zipfile zipgrep (1) - search files in a ZIP archive for lines matching a pattern zipinfo (1) - list detailed information about a ZIP archive zipnote (1) - write the comments in zipfile to stdout, edit comments and renam... zipsplit (1) - split a zipfile into smaller zipfiles ➜ ~
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