A script named process_users.sh expects entries from standard input. Which command sends the contents of users.csv into the script’s input so it processes each line?
./process_users.sh << users.csv
./process_users.sh < users.csv
./process_users.sh users.csv
./process_users.sh >> users.csv
The < operator redirects a file to a program’s standard input. In this case, ./process_users.sh < users.csv feeds the file into the script correctly. Passing the filename as an argument does not send it to the input stream, appending with >> affects output rather than input, and using << without a proper delimiter invokes a here-document, not a file redirect.
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