功能介紹：
locate命令其實是find -name的另一種寫法，但是要比后者快得多，原因在于它不搜索具體目錄，而是搜索一個數據庫/var/lib/locatedb，值得注意的是：版本不同，會有所不同。有的版本位置是
/var/lib/mlocate/mlocatedb ，還有的是/var/lib/slocate/slocate.db ，這個數據庫中含有本地所有文件信息。linux系統自動創建這個數據庫，并且每天自動更新一次，所以使用locate命令查不到最新變動過的文件。為了避免這種情況，可以在使用locate之前，先使用updatedb命令，手動更新數據庫。
語法格式：locate [參數] [樣式]
常用參數：
-d<目錄>或–database=<目錄>
指定數據庫所在的目錄
–help
顯示幫助
–version
顯示版本信息
參考實例：
顯示幫助 ：
[root@linuxcool ~]# locate --help Usage: locate [OPTION]… [PATTERN]… Search for entries in a mlocate database. -A, --all only print entries that match all patterns -b, --basename match only the base name of path names -c, --count only print number of found entries -d, --database DBPATH use DBPATH instead of default database (which is /var/lib/mlocate/mlocate.db) -e, --existing only print entries for currently existing files -L, --follow follow trailing symbolic links when checking file existence (default) -h, --help print this help -i, --ignore-case ignore case distinctions when matching patterns -l, --limit, -n LIMIT limit output (or counting) to LIMIT entries -m, --mmap ignored, for backward compatibility -P, --nofollow, -H don't follow trailing symbolic links when checking file existence -0, --null separate entries with NUL on output -S, --statistics don't search for entries, print statistics about each used database -q, --quiet report no error messages about reading databases -r, --regexp REGEXP search for basic regexp REGEXP instead of patterns --regex patterns are extended regexps -s, --stdio ignored, for backward compatibility -V, --version print version information -w, --wholename match whole path name (default) Report bugs to mitr@redhat.com. 顯示版本信息： [root@linuxcool ~]# locate --version mlocate 0.26 Copyright (C) 2007 Red Hat, Inc. All rights reserved. This software is distributed under the GPL v.2. This program is provided with NO WARRANTY, to the extent permitted by law.
搜索/etc目錄下所有以sh開頭的文件：
[root@linuxcool ~]# locate /etc/sh /etc/shadow /etc/shadow- /etc/shells
搜索/etc目錄下以k開頭的文件：
[root@linuxcool ~]# locate /etc/k /etc/kdump.conf /etc/kernel /etc/krb5.conf /etc/krb5.conf.d /etc/ksmtuned.conf /etc/kernel/postinst.d /etc/kernel/postinst.d/51-dracut-rescue-postinst.sh
查找和pwd相關的所有文件：
[root@linuxcool ~]# locate pwd /boot/extlinux/pwd.c32 /etc/.pwd.lock /usr/bin/pwd /usr/bin/pwdx /usr/include/pwd.h /usr/lib/modules/3.10.0-514.el7.x86_64/kernel/drivers/watchdog/hpwdt.ko /usr/lib64/cracklib_dict.pwd /usr/lib64/Python2.7/lib-dynload/spwdmodule.so /usr/sbin/unix_chkpwd /usr/share/cracklib/cracklib-small.pwd /usr/share/cracklib/pw_dict.pwd /usr/share/man/man0p/pwd.h.0p.gz /usr/share/man/man1/pwd.1.gz /usr/share/man/man1/pwdx.1.gz /usr/share/man/man1p/pwd.1p.gz /usr/share/man/man3/lckpwdf.3.gz /usr/share/man/man3/ulckpwdf.3.gz /usr/share/man/man8/unix_chkpwd.8.gz /usr/share/man/overrides/de/man1/pwdx.1 /usr/share/man/overrides/fr/man1/pwdx.1 /usr/share/man/overrides/uk/man1/pwdx.1 /usr/share/syslinux/pwd.c32 /usr/src/kernels/3.10.0-514.el7.x86_64/include/config/hpwdt /usr/src/kernels/3.10.0-514.el7.x86_64/include/config/hpwdt/nmi /usr/src/kernels/3.10.0-514.el7.x86_64/include/config/hpwdt/nmi/decoding.h
