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gxl2gv:tldr:2fb6e
This command is a Unix shell command that is used to convert a GXL file into a Graphviz file. Here's the breakdown:
-
cat
: This command is used to concatenate and display the contents of files. In this case, it is used to read the contents of the file referred to by the value of the variableinput
, or a default value of "gxl" if the variable is not set. -
${input-gxl}
: This is a variable substitution in the form${variable-default_value}
. It is used to substitute the value of the variableinput
. Ifinput
is set, its value will be used. If not, the default value "gxl" will be used instead. -
|
: This is a pipe operator and is used to redirect the output of thecat
command to the input of the following command. -
gxl2gv
: This is a command or program that takes GXL (Graph eXchange Language) files as input and converts them into Graphviz files. -
>
: This is the output redirection operator and is used to redirect the output of the previous command (gxl2gv
) to the file referred to by the value of the variableoutput
, or a default value of "gv" if the variable is not set. -
${output-gv}
: Similar to the${input-gxl}
substitution, this substitutes the value of the variableoutput
. Ifoutput
is set, its value will be used. If not, the default value "gv" will be used instead.
So, in summary, this command reads the contents of a file (specified by the input
variable or default value), converts it from GXL to Graphviz format using gxl2gv
, and saves the output to another file (specified by the output
variable or default value).