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Delete All Objects From An S3 Bucket Using S3cmd

Find the package that installed a command

Find the package that installed a command

determine if tcp port is open
Requires netcat.

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"

Download all .key files from your android device to your pc.

ssh autocomplete
Autocomplete from .ssh/config

floating point operations in shell scripts
using bc is for sissies. dc is much better :-D Polish notation will rule the world...

Debug bash shell scripts.
Display commands and their arguments as they are executed. Useful for debugging shell scripts.

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


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