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.TH "PORT\-DEPENDENTS" "1" "2\&.10\&.99" "MacPorts 2\&.10\&.99" "MacPorts Manual"
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.SH "NAME"
port-dependents, port-rdependents \- List ports that depend on a given (installed) port
.SH "SYNOPSIS"
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.nf
\fBport\fR [\fB\-D\fR \fIportdir\fR] \fBdependents\fR
     [[\fIportname\fR | \fIpseudo\-portname\fR | \fIport\-expressions\fR | \fIport\-url\fR]]
.fi
.sp
.nf
\fBport\fR [\fB\-D\fR \fIportdir\fR] \fBrdependents\fR
     [[\fIportname\fR | \fIpseudo\-portname\fR | \fIport\-expressions\fR | \fIport\-url\fR]]
.fi
.SH "DESCRIPTION"
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\fBport dependents\fR reports which ports depend upon a given (installed) port, if any\&. Note that \fBdependents\fR does not work for ports that are not installed on your system\&. It uses the database of installed ports that MacPorts keeps internally, which records the dependency relations at installation time\&. \fBport dependents\fR prints this information\&.
.sp
For this reason, \fBport dependents\fR does not work for ports that are not installed on your system\&. If you want to find out which ports depend on a port you haven\(cqt installed, you can use the \fBdepends:\fR pseudo\-portname selector:
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.if n \{\
.RS 4
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.nf
port echo depends:<portname>
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.if n \{\
.RE
.\}
.sp
This command will, however, not cover dependencies that are only present in non\-default variants\&. For more information about pseudo\-portname selectors, see \fBport\fR(1)\&.
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\fBport rdependents\fR will print a tree of installed ports that depend on the given port\&.
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The dependency relations printed by \fBport dependents\fR and \fBport rdependents\fR are the same that are used to determine if a port can be safely uninstalled\&. Ports that still have dependents installed cannot be safely uninstalled without possibly breaking their dependents\&. All dependents can be removed at the same time using the \fB\-\-follow\-dependents\fR flag\&. The check can be ignored using the \fB\-f\fR flag\&. See \fBport-uninstall\fR(1) for more details\&.
.SH "DEPENDENCY RELATIONS"
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Do not confuse \fIdependents\fR and \fIdependencies\fR (or, shortened, \fIdeps\fR)\&. Refer to the following example to understand the difference:
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.if n \{\
.RS 4
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portA \-\-> portB
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.if n \{\
.RE
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\fBportA\fR depends on \fBportB\fR, i\&.e\&., \fBportA\fR needs \fBportB\fR to run\&. Because of that, \fBportB\fR is a \fIdependency\fR (or \fIdep\fR) of \fBportA\fR\&. After installing \fBportA\fR, \fBportB\fR has been automatically installed\&. At this point, \fBportA\fR has become a \fIdependent\fR of \fBportB\fR\&. You can only uninstall \fBportB\fR once all of its dependents (i\&.e\&., including \fBportA\fR) have been uninstalled\&.
.SH "SEE ALSO"
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\fBport\fR(1), \fBport-echo\fR(1), \fBport-deps\fR(1), \fBport-uninstall\fR(1)
.SH "AUTHORS"
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.nf
(C) 2014 The MacPorts Project
Clemens Lang <cal@macports\&.org>
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