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Examine processes generating traffic on your website
I often have to google this so I put it here for quick reference.

Super Speedy Hexadecimal or Octal Calculations and Conversions to Decimal.
^Hexadecimal Ten minus Octal Ten is Eight(in Decimal). $ echo "$(( 0xaf )) = $(( 0257 ))" ^Hexadecimal AF and Octal 257 are both Decimal 175.

Alternative size (human readable) of files and directories (biggest last)

Show current working directory of a process

Advanced python tracing
Trace python statement execution and syscalls invoked during that simultaneously

Count occurrences per minute in a log file
The cut should match the relevant timestamp part of the logfile, the uniq will count the number of occurrences during this time interval.

Generate a random password 30 characters long

How to run a command on a list of remote servers read from a file
The important thing to note in this command, is the "-n" flag.

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"

Count opening and closing braces in a string.
This function counts the opening and closing braces in a string. This is useful if you have eg long boolean expressions with many braces and you simply want to check if you didn't forget to close one.


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