Martin questions

• What is the purpose of lines which start with double colon in TCL?
• execute a command during every n-th iteration
• How to configure mypy to ignore a stub file for a specific module?
• Understanding sed hold-space work-flow
• difference between "exec" and "exit" in bash
• modify Ethernet FSC in Scapy
• algorithm to find IPv4 networks in CIDR notation between two IPv4 addresses
• listen for returning UDP packets in bash
• How to decrease TCP connect() system call timeout?
• security concerns with Perl /e modifier

Martin answers