q

Execute SQL-like queries on CSV and TSV files. More information: https://harelba.github.io/q.

• Query a CSV file by specifying the delimiter as ',':

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

• Query a TSV file:

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

• Query file with header row:

q -ddelimiter -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 -Ddelimiter -O "SELECT column as alias from path/to/file"