Captures video from webcam and encodes it using the accelerated hardware provided by videotoolbox framework. It takes about 20% cpu in a i5 2015 macbook air.

Downloads each file from a github gist individually.

Requires jq ( https://stedolan.github.io/jq/ ).

passin list of docker container IDs to docker stop

I wanted to count and display the top directories containing JavaScript files in some of my project. Here it is. Maybe it can be written to more simply syntax by using find -exec...

simple jq one-liner to convert from configmaps to secrets (which require the values to be base64 encoded).

To automatically pull the config map, convert it, and re-upload the corresponding secret:

kubectl get --export -o json cm [configmap name] | jq 'with_entries(if .key == "data" then .value=(.value | to_entries | map( { (.key): (.value|@base64) } ) | add ) elif .key == "kind" then .value="Secret" else . end)' > secret.json; kubectl create -f secret.json

The classical 'ps aux | grep' can do this with one more parameter, the '-v', with means 'NOT' to grep.

Hides the process "your_command" from showing with ps, displaying some other random process name already running for a better camouflage.

ffmpeg covert m3u8 to facebook live stream

ffmpeg mp4 to facebook live steam

This is a bit of a bash hack to catch STDERR and append a log level to it.

So for example, if your script has pseudo loglevels like so:

echo "INFO - finding files"

[ -f ${files} ] || echo "WARN - no files found"

Any subcommands that write to STDERR will screw that up

Adding 2> >(fb=$(dd bs=1 count=1 2>/dev/null | od -t o1 -A n); [ "$fb" ] && err=$(printf "\\${fb# }"; cat) && echo "ERROR - $err") to the command does the following:

2>

Redirect STDERR

>(

Spawn a subshell (STDERR is then redirected to the file descriptor for this subshell)

fb=$(....)

get the first byte of input

[ "$fb" ]

test if there's a first byte

&& err=$(printf....)

save the output to the $err variable

&& echo "ERROR - $err"

append your pseudo loglevel and the error message

Heavily borrowed from https://unix.stackexchange.com/questions/33049/check-if-pipe-is-empty-and-run-a-command-on-the-data-if-it-isnt

It takes the first value of /prov/loadavg to print that many stars followed by the value.

Docker's local man pages are (often) half of what you have online, so I wanted that as local man.

Install lynx and run my oneliner, then use as follows:

dockpage

Adjust lynx's page width at will

Usefull, for example, when many ports are exposed and the docker ps output looks cluttered.

Disable password expiration and clear password history for VMware vcenter appliance

Won't work with password login. You must add your RSA key to the server's authorizedkeys file, or change the ssh command adding the -i option for a custom RSA key:

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/tmp/mysqld.temp.sock will be created locally by socat, don't create it yourself. The folder it lives must be writable. Connect your MySQL client to this socket, with database and username set properly.

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In case you need to forward a remote socket to a LOCAL PORT instead, check http://www.commandlinefu.com/commands/view/9436/socat-tcp-listen5500-execssh-userremotehost-socat-stdio-unix-connectvarrunmysqldmysqld.sock

Generate a random password quickly in CLI using openssl

For example to add up the disk usage at several disjoint locations.

The $[..] is for arithmetic evaluation in bash.

Alternatively pipe to the bc command.

Some sites running on basic web servers don't support the HEAD request, so using "curl -I" on them doesn't work. This will automatically try "curl -I" at first and if that fails with a 4xx or 5xx status code, it falls back to "curl -i" and prints only the headers from that.