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PTSORT(1) General Commands Manual PTSORT(1) NAME ptsort -- Prioritized topological sort SYNOPSIS ptsort [-DdPpqsv] [-o output] [input ...] DESCRIPTION The ptsort utility takes a directed acyclic graph of nodes as input and outputs the nodes in topological order. Unlike tsort(1), the ptsort utility allows nodes to be given a numeric priority. Priorities are propagated along edges so that each node's priority is greater than the priority of all its successors. Thus, it is possible to boost a spe- cific node so that it, and all its predecessors, will be listed ahead of other unrelated nodes. The following options are available: -D Sort the output by depth first instead of priority first. -d Include each node's depth in the output. -P Print all nodes with the same priority (or the same depth if -D was specified) on the same line. Can be combined with -d if and only if -D is also specified, and with -p if and only if it is not. -p Include each node's priority in the output. -q Quiet mode. Do not warn about cycles in the input. -s Strict mode. Cycles in the input will cause ptsort to ter- minate with an exit code of 3. -v Verbose mode. Show detailed information while building and traversing the graph. The ptsort utility takes its input either from the files listed on the command line or, if no files were specified, from the standard input. All input is read into the same graph before processing. Each input line contains either two names or a name and a decimal inte- ger, separated by any amount of whitespace. Any amount of leading or trailing whitespace is permitted. Names are arbitrary non-empty se- quences of up to 255 printable, non-whitespace ASCII characters. It is strictly speaking possible, but not a good idea, for a node's name to consist entirely of digits. If the line contains two names, the effect is to insert a directed edge into the graph going from the first (predecessor) node to the second (successor) node. Either or both nodes are created if they do not al- ready exist. If both names are identical, no edge is inserted, but the node is still created unless it already exists. If the line contains a name and a number, the effect is to raise the priority of that node to the given number, unless it is already higher. The node will be created if it does not already exist. Blank lines in the input are ignored. Any error in the input will cause ptsort to print an error message which includes the offending line and terminate with an exit code of 2. If no error occurred, the ptsort utility ouputs one line for each node in the graph, consisting of the node's name optionally preceded by its depth (if the -d option was specified) and / or priority (if the -p op- tion was specified). By default, the list is sorted in decreasing or- der of priority, then depth, then name. If the -D option was speci- fied, it is sorted in decreasing order of depth, then priority, then name. DIAGNOSTICS If an error occurred, the ptsort utility exits with one of the follow- ing codes: 1 An error occurred while opening or reading from an input file or while trying to allocate memory. 2 A syntax error was encountered in the input. 3 A cycle was detected while running in strict mode. Otherwise, it exits with code 0. SEE ALSO tsort(1) AUTHORS The ptsort utility and this manual page were written by Dag-Erling Smorgrav <des@des.no>. BUGS The ptsort utility uses a completely different algorithm than the simi- lar tsort(1) and may therefore produce different (but topologically equivalent) output when given the same input. The ptsort utility should probably have been named klatch, but the au- thor has no imagination or appreciation for the literary arts. FreeBSD ports 15.0 September 13, 2024 PTSORT(1)
NAME | SYNOPSIS | DESCRIPTION | DIAGNOSTICS | SEE ALSO | AUTHORS | BUGS
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