I wanted to calculate the script speed for a large number of funscripts so I produced this Bash script. Probably far from perfect (not sure how script speed is usually calculated?) but works and maybe could be useful for someone else.

**Prerequisites**

Assumes running a Bash command prompt (like the macOS Terminal app). You also need to have `jq`

installed. Instructions for mac to install homebrew and jq:

```
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
brew install jq
```

**The script: calculate_speed.sh**

Copy paste the code below into a file called something like `calculate_speed.sh`

:

```
#!/bin/bash
# Check if a file name is provided as an argument
if [ -z "$1" ]; then
echo "Usage: $0 <json_file>"
exit 1
fi
# Check if jq is installed
if ! command -v jq &> /dev/null; then
echo "jq is not installed. Please install jq to process JSON."
exit 1
fi
# Extract the 'at' and 'pos' values from the JSON file
times_and_positions=$(jq -r '.actions[] | "\(.at) \(.pos)"' "$1")
# Initialize variables
prev_time=0
prev_pos=0
first=1
speeds=()
# Calculate speed between consecutive actions
while read -r line; do
IFS=' ' read -r current_time current_pos <<< "$line"
if [ "$first" -eq 1 ]; then
first=0
else
# Calculate speed as delta position / delta time (ensure no division by zero)
delta_time=$((current_time - prev_time))
if [ "$delta_time" -ne 0 ]; then
delta_pos=$((current_pos - prev_pos))
if [ "$delta_pos" -lt 0 ]; then
delta_pos_abs=$((delta_pos * -1))
else
delta_pos_abs=$delta_pos
fi
speed=$(bc -l <<< "(($delta_pos_abs)) / $delta_time")
speeds+=($speed)
fi
fi
prev_time=$current_time
prev_pos=$current_pos
done <<< "$times_and_positions"
# Sort the speeds array to find the median
sorted_speeds=($(printf '%s\n' "${speeds[@]}" | sort -n))
# Calculate median
len=${#sorted_speeds[@]}
if [ $((len % 2)) -eq 1 ]; then
median=${sorted_speeds[$((len / 2))]}
else
mid=$((len / 2))
median=$(bc -l <<< "((${sorted_speeds[$mid]} + ${sorted_speeds[$((mid - 1))]} ) / 2) * 1000")
fi
# Output the median speed
echo "$median"
```

You also need to make the file executable:

`chmod +x calculate_speed.sh`

**Usage**

Run the script with a funscript file as input to get the speed:

`./calculate_speed.sh myscript.funscript`