opkg是个安装器，小巧，功能全。
root@hbg:/# opkg files opkg
Package opkg (9c97d5ecd795709c8584e972bfdf3aee3a5b846d-7) is installed on root and has the following files:
/bin/opkg --命令存放地
/etc/opkg.conf --配置文件
查看已经安装的包信息：
cat /usr/lib/opkg/status
root@hbg:# cat /usr/lib/opkg/status
Package: snmp-utils --包名称
Version: 5.4.4-1 --版本信息
Depends: libc, libnetsnmp --依赖库
Status: install user installed --状态信息，用户后来安装，还是包安装时已经内置的
Architecture: ar71xx --架构信息
Installed-Time: 1450492264 --安装时间
Package: kmod-usb-storage
Version: 3.10.49-1
Depends: kernel (= 3.10.49-1-df26e12aa07bfcf42c989a3a108d9f47), kmod-scsi-core, kmod-usb-core
Status: install hold installed
Architecture: ar71xx
Installed-Time: 1450492264
安装包的详细信息
/usr/lib/opkg/info
列表信息：
/usr/lib/opkg/list
目前支持的操作:
root@hbg:/# opkg
opkg must have one sub-command argument
usage: opkg [options...] sub-command [arguments...]
where sub-command is one of:
Package Manipulation:
update Update list of available packages --更新所有可以更新的包
upgrade <pkgs> Upgrade packages --更新某个包
install <pkgs> Install package(s) --安装某个包
configure <pkgs> Configure unpacked package(s)
remove <pkgs|regexp> Remove package(s) --移除某个包
flag <flag> <pkgs> Flag package(s)
<flag>=hold|noprune|user|ok|installed|unpacked (one per invocation)
Informational Commands:
list List available packages --列出所有可以列出的包
list-installed List installed packages --列出安装的包 （在本地设备中测试出跟list命令结果一样）
list-upgradable List installed and upgradable packages --列出安装的可以更新的包
list-changed-conffiles List user modified configuration files --列出用户更改过配置文件的包
files <pkg> List files belonging to <pkg>
search <file|regexp> List package providing <file>
find <regexp> List packages whose name or description matches <regexp>
info [pkg|regexp] Display all info for <pkg> --列出相关包的信息
status [pkg|regexp] Display all status for <pkg> --列出相关包的状态
download <pkg> Download <pkg> to current directory
compare-versions <v1> <op> <v2>
compare versions using <= < > >= = << >>
print-architecture List installable package architectures
depends [-A] [pkgname|pat]+
whatdepends [-A] [pkgname|pat]+
whatdependsrec [-A] [pkgname|pat]+
whatrecommends[-A] [pkgname|pat]+
whatsuggests[-A] [pkgname|pat]+
whatprovides [-A] [pkgname|pat]+
whatconflicts [-A] [pkgname|pat]+
whatreplaces [-A] [pkgname|pat]+
Options:
-A Query all packages not just those installed
-V[<level>] Set verbosity level to <level>.
--verbosity[=<level>] Verbosity levels:
0 errors only
1 normal messages (default)
2 informative messages
3 debug
4 debug level 2
-f <conf_file> Use <conf_file> as the opkg configuration file
--conf <conf_file>
--cache <directory> Use a package cache
-d <dest_name> Use <dest_name> as the the root directory for
--dest <dest_name> package installation, removal, upgrading.
<dest_name> should be a defined dest name from
the configuration file, (but can also be a
directory name in a pinch).
-o <dir> Use <dir> as the root directory for
--offline-root <dir> offline installation of packages.
--add-arch <arch>:<prio> Register architecture with given priority
--add-dest <name>:<path> Register destination with given path
Force Options:
--force-depends Install/remove despite failed dependencies --强制安装或卸载，不关心依赖关系
--force-maintainer Overwrite preexisting config files
--force-reinstall Reinstall package(s)
--force-overwrite Overwrite files from other package(s)
--force-downgrade Allow opkg to downgrade packages
--force-space Disable free space checks
--force-postinstall Run postinstall scripts even in offline mode
--force-remove Remove package even if prerm script fails
--force-checksum Don't fail on checksum mismatches
--noaction No action -- test only
--download-only No action -- download only
--nodeps Do not follow dependencies --不安装依赖包
--nocase Perform case insensitive pattern matching
--force-removal-of-dependent-packages
Remove package and all dependencies
--autoremove Remove packages that were installed
automatically to satisfy dependencies
-t Specify tmp-dir.
--tmp-dir Specify tmp-dir.
regexp could be something like 'pkgname*' '*file*' or similar
e.g. opkg info 'libstd*' or opkg search '*libop*' or opkg remove 'libncur*'