q

Execute SQL-like queries on .csv and .tsv files.

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• Query .csv file by specifying the delimiter as ',':

q -d',' "SELECT * from {path/to/file}"

• Query .tsv file:

q -t "SELECT * from {path/to/file}"

• Query file with header row:

q -d{delimiter} -H "SELECT * from {path/to/file}"

• Read data from stdin; '-' in the query represents the data from stdin:

{output} | q "select * from -"

• Join two files (aliased as f1 and f2 in the example) on column c1, a common column:

q "SELECT * FROM {path/to/file} f1 JOIN {path/to/other_file} f2 ON (f1.c1 = f2.c1)"

• Format output using an output delimiter with an output header line (note: command will output column names based on the input file header or the column aliases overridden in the query):

q -D{delimiter} -O "SELECT {column} as {alias} from {path/to/file}"

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