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Batch rename extension of all files in a folder, in the example from .txt to .md

Get full directory path of a script regardless of where it is run from
Also resolves symlinks, showing the full path of the link target

Convert seconds to [DD:][HH:]MM:SS
Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

list the top 15 folders by decreasing size in MB
list the top 15 folders by decreasing size in MB

Recompress all files in current directory from gzip to bzip2
Find all .gz files and recompress them to bz2 on the fly. No temp files. edit: forgot the double quotes! jeez!

Query well known ports list
Uses the file located in /etc/services

Print github url for the current url
Works for repos cloned via ssh or https.

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"

Get full directory path of a script regardless of where it is run from
Also resolves symlinks, showing the full path of the link target

Display any tcp connections to apache
Sometimes apache will get stuck in an established state where you can't get a list of the connecting IP's from mod_status... not a good thing when you need to ban an abusive ip.


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