gv2gxl:tldr:4995c

This command is a Unix command used to convert a file from Graph Visualization (GV) format to Graph eXchange Language (GXL) format.

Here's an explanation of each part of the command:

1. cat: It is a command used to concatenate and display the contents of a file. In this case, it is used to read the contents of the input file.

2. ${input-gv}: This is a variable that represents the input file name. The -gv is a suffix used to indicate that the file is in GV format.

3. |: It is a pipe symbol that connects the output of one command to the input of another. In this case, it connects the output of cat to the input of the next command gv2gxl.

4. gv2gxl: It is a command-line tool used to convert GV format files to GXL format files. It takes the input from the previous command and performs the conversion.

5. ${output-gxl}: This is a variable that represents the output file name. The -gxl is a suffix used to indicate that the file will be in GXL format. The converted content from gv2gxl command will be written to this file.

Overall, the command reads the input file in GV format, converts it to GXL format using gv2gxl command, and writes the converted content to the output file.