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Understanding the output of \d <table> in psql

Say I run the following command: \d mtb.big_table I get the output shown below. My questions are: What are column modifiers? (what does default now() mean?) Under Indexes, Why do some indices ...
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How to use psql with no password prompt?

I have wrote a script to REINDEX many indexes in a database. Here is one of them: echo -e "\nreindex for unq_vbvdata_vehicle started at: `date "+%F %T"`" >> ${LOG_FILE} psql -U ${USERNAME} -h ...