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Find default gateway (proper at ppp connections too)

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"

floating point operations in shell scripts
-l auto-selects many more digits (but you can round/truncate in your head, right) plus it loads a few math functions like sin().

add all files not under version control to repository
This should handle whitespaces well and will not get confused if your filenames have "?" in them

Show a config file without comments

Adding Prefix to File name

check open ports without netstat or lsof

Watch the progress of 'dd'
The previously-posted one-liner didn't work for me for whatever reason, so I ended up doing this instead.

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" }

Diff files over SSH
Sometimes you need to compare two config files on different servers. Put the file names into the above script and let 'er rip.


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