entr:tldr:b71d8

This is actually not a valid command syntax. It seems you have mixed up different commands and not followed the correct syntax for pipeline.

Let me break it down and explain the elements you used:

1. ${ls *-sql}: This is not a valid command. It seems like you tried to use the ls command with a wildcard *-sql to list files with a suffix "-sql". However, wrapping it with ${} is unnecessary and incorrect syntax.

2. |: The pipe symbol | is used in a command-line interface to pass the output of one command as input to another command. It creates a pipeline for data flow between them.

3. entr: This is a command-line tool used to continuously monitor files and directories for changes, and then execute a command when a change occurs. However, in your command, it is positioned incorrectly after the pipe symbol.

4. ${psql -f} /_: This is again not a valid syntax. It seems like you wanted to run the psql command with the -f option to specify a file, and then provide the file path "/_" as an argument for that file. However, wrapping it with ${} is unnecessary and incorrect syntax.

To provide a valid explanation or correct the command, please provide further information on what you are trying to achieve or the specific commands you want to use.