#!/bin/bash
help() {
echo 'sqlite3cat: simple sqlite3 DB viewer.
    Usage:  sqlite3cat [FILE] [TABLE/QUERY/-l]

    first argument:  sqlite3 file
    second, optional argument:
       TABLE: If not given, first in schema used.
       QUERY: If the second argument contains spaces, it is assumed to be a query.
       -l: List table names

    '
}
[[ "$1" == "-h" ]] && {
    help; exit
}
[[ -f "$1" ]] || {
    help;    exit
}

sqlfile="$1"
[[ "$2" == "-l" ]] && {
    sqlite3 "$sqlfile" "SELECT name FROM sqlite_master WHERE name NOT LIKE 'sqlite_%'"
    exit
}

[[ -z "$2" ]] && {
    table=$( sqlite3 "$sqlfile" "SELECT name FROM sqlite_master WHERE name NOT LIKE 'sqlite%' LIMIT 1;" )
} || {
    table="$2"
}
[[ "$table" = "${table% *}" ]] && {
    query="SELECT * FROM $table;"
    echo "$query"
} || {
    query="$table"
}

sqlite3 -header -column -nullvalue NA "$sqlfile" "$query"