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Top ten memory hogs
Inspired by #7065

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Find unused IPs on a given subnet

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Fetch the Gateway Ip Address
Better use iproute2 !

Apache memory usage

Find the package that installed a command

Given $PID, print all child processes on stdout
Simpler.

For finding out if something is listening on a port and if so what the daemon is.
See what's listening on your IPv4 ports on FreeBSD.

Run a program transparently, but print a stack trace if it fails
For automated unit tests I wanted my program to run normally, but if it crashed, to add a stack trace to the output log. I came up with this command so I wouldn't have to mess around with core files. The one downside is that it does smoosh your program's stderr and stdout together.


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