How to find reverse dependency on Debian/Ubuntu based GNU/Linux?

List all the reverse depends of certain package:

$ apt-cache rdepends pkg_name

For example:

$ apt-cache rdepends vde2

And you’ll get result like this:

vde2
Reverse Depends:
virtualbox
qemu-system-x86
qemu-system-sparc
qemu-system-ppc
qemu-system-misc
qemu-system-mips
qemu-system-arm
user-mode-linux
virtualbricks
virtualbox
vdetelweb
libvde-dev
libvde-dev
user-mode-linux
qemu-kvm
qemu-system
liblwipv6-2

More details via $ apt-cache showpkg pkg_name

Package: vde2
Versions:
2.3.2-4 (/var/lib/apt/lists/opensource.nchc.org.tw_debian_dists_wheezy_main_binary-amd64_Packages) (/var/lib/dpkg/status)
Description Language:
File: /var/lib/apt/lists/opensource.nchc.org.tw_debian_dists_wheezy_main_binary-amd64_Packages
MD5: c1d59c710a94c274459c01b82f926c5a
Description Language: en
File: /var/lib/apt/lists/opensource.nchc.org.tw_debian_dists_wheezy_main_i18n_Translation-en
MD5: c1d59c710a94c274459c01b82f926c5a

Reverse Depends:
virtualbox,vde2
qemu-system-x86,vde2
qemu-system-sparc,vde2
qemu-system-ppc,vde2
qemu-system-misc,vde2
qemu-system-mips,vde2
qemu-system-arm,vde2
user-mode-linux,vde2
virtualbricks,vde2
virtualbox,vde2
vdetelweb,vde2
libvde-dev,vde2 2.3.2-1
libvde-dev,vde2 2.3.2-1
user-mode-linux,vde2
qemu-kvm,vde2
qemu-system,vde2
liblwipv6-2,vde2
Dependencies:
2.3.2-4 – adduser (0 (null)) libc6 (2 2.7) libpcap0.8 (2 0.9.8) libvde0 (0 (null)) libvdeplug2 (0 (null)) vde2-cryptcab (0 (null)) qemu-kvm (0 (null)) qemu (0 (null)) vde (0 (null))
Provides:
2.3.2-4 –
Reverse Provides:

If we only want to know the installed dependencies, ask aptitude:

$ aptitude why vde2

It’ll tell us:

i qemu Depends qemu-system (>= 1.1.2+dfsg-6a+deb7u6)
i A qemu-system Recommends vde2

What about recursive depends? Try $ apt-rdepends --reverse pkg_name !
(Install via apt-get install apt-rdepends)

PS: reverse-depends has similar feature, but it’s in ubuntu-dev-tools, which depends on toooooo many packages, so I’ll not suggest you to use it for just finding the dependencies.

dpkg: error: parsing file ‘/var/lib/dpkg/available’ near line N

好像是因為上一次用apt-get在安裝套件的時候意外中斷造成的

剛剛在裝irssi來掛IRC的時候就卡在這…


peterdavehello@vm-0:~$ sudo apt-get install irssi
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
libperl5.14
Suggested packages:
irssi-scripts
The following NEW packages will be installed:
irssi libperl5.14
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/902 kB of archives.
After this operation, 2,446 kB of additional disk space will be used.
Do you want to continue [Y/n]?
dpkg: error: parsing file '/var/lib/dpkg/available' near line 63:
missing package name
E: Sub-process /usr/bin/dpkg returned an error code (2)

解法:
peterdavehello@vm-0:~$ sudo dpkg --clear-avail
搞定收工!