Commands by buybag (0)

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cd into another dir to run a one-liner, but implicitly drop back to your $OLD_PWD after
Obviously the example given is necessarily simple, but this command not only saves time on the command line (saves you using "cd -" or, worse, having to type a fully qualified path if your command cd's more than once), but is vital in scripts, where I've found the behaviour of "cd -" to be a little broken at times.

Quickly find a count of how many times invalid users have attempted to access your system

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

Encode a string using ROT47
This command will encode a string using the ROT47 cipher.

Edit a PDF's metadata using exiftool
Edit the pdf file foo.pdf's metadata. -overwrite_original overwrites the original file (w/o it exiftool creates a new file)

Downsample mp3s to 128K
This will lower the quality of mp3 files, but is necessary to play them on some mobile devices.

reapair all mySQL/mariaDB databases
while dumping database if you see following error/warning than you have to repair broken tables/rows

Adding formatting to an xml document for easier reading
Sometimes you're trying to read through an xml file to determine whats wrong with it and a tool had removed all the linebreaks. xmllint will go ahead and make it pretty for you.

Using NMAP to check if a port is open or close
Using NMAP to check to see if port 22(SSH) is open on servers and network devices.

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"

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