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Prepend a text to a file.
Using the sed -i (inline), you can replace the beginning of the first line of a file without redirecting the output to a temporary location.

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"

Check if *hardware* is 32bit or 64bit
This command tell you if your hardware is 32 or 64 bits even if you install a 32bits OS on a 64 bits hardware. If your distro don't support the -q switch, try doing : $ grep &>/dev/null '\' /proc/cpuinfo && echo 64 bits || echo 32 bits

Prepend a text to a file.
Prepend text to a file. It doen't need temporary files, ed or sed.

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" }

Open (in vim) all modified files in a git repository
The option --porcelain makes the output of git easier to parse. This one-liner may not work if there is a space in the modified file name.

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"

A Console-based Audio Visualizer for ALSA
# Installing apt search cava sudo apt install cava # modify the default config to change the colors by their hex color code cava -p mkdir ~/.cava nano ~/.cava/config cava # run with changes!

grab all of google IPv4 network blocks

Find usb device in realtime
Using this command you can track a moment when usb device was attached.


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