textql:tldr:6bc5e
This command is used to process the contents of a file using the textql tool. Here's an explanation of the command:
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cat ${filename}: Thecatcommand is used to output the contents of the specified file (${filename}represents the variable holding the file name). -
|: This vertical bar character is a pipe symbol that is used to redirect the output of the preceding command (in this case, the file contents) to the input of the next command (textql). -
textql -sql "${SELECT * FROM stdin}": Thetextqlcommand is a tool for executing SQL queries on plain text data. The-sqloption is used to specify an SQL query to be executed. In this case, the query is${SELECT * FROM stdin}, where${}is used to denote a variable (in this case, the variable represents the file contents).
Overall, the command reads the contents of a file (using cat), redirects it to textql, and executes an SQL query (SELECT * FROM stdin) on that data.