displays an ASCII line chart Chrome Memory Usage
# This script monitors the total memory usage of all Chrome processes # and displays an ASCII line chart of the usage over the last 2 hours, # ensuring the chart always fits within the terminal width.
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249
memory_chrom.sh
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249
memory_chrom.sh
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#!/bin/bash
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# This script monitors the total memory usage of all Chrome processes
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# and displays an ASCII line chart of the usage over the last 2 hours,
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# ensuring the chart always fits within the terminal width.
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# Configuration
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INTERVAL_SECONDS=5 # How often to sample memory usage (in seconds)
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DURATION_HOURS=2 # How many hours of data to display on the chart
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DATA_FILE="/tmp/chrome_memory_data.txt" # Temporary file to store historical data
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CHART_HEIGHT=20 # Number of lines for the chart's vertical height (excluding labels)
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# --- Script Initialization ---
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# Clear the terminal when the script starts
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tput clear
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# Ensure the temporary data file exists. If it doesn't, touch creates it.
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touch "$DATA_FILE"
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# --- Functions ---
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# Function to get the total memory usage of all Chrome processes in MB.
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# It sums the Resident Set Size (RSS) for all processes named 'chrome'.
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get_chrome_memory_usage() {
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# Find all process IDs (PIDs) for processes named 'chrome'.
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# '-d,' makes pgrep output PIDs separated by commas, suitable for 'ps -p'.
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local pids=$(pgrep -d, chrome)
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# If no Chrome processes are found, return 0.
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if [ -z "$pids" ]; then
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echo "0"
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return
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fi
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# Sum the RSS (Resident Set Size) in KB for all identified Chrome PIDs.
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# 'ps -p "$pids" -o rss=' outputs only the RSS value in KB for each PID.
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# '2>/dev/null' suppresses errors if some PIDs no longer exist.
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# 'awk' sums all the RSS values.
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local total_rss_kb=$(ps -p "$pids" -o rss= 2>/dev/null | awk '{s+=$1} END {print s}')
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# If no memory is reported (e.g., processes died between pgrep and ps), return 0.
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if [ -z "$total_rss_kb" ]; then
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echo "0"
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return
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fi
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# Convert KB to MB (1024 KB = 1 MB) using 'bc' for floating-point arithmetic.
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local total_rss_mb=$(echo "scale=2; $total_rss_kb / 1024" | bc)
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echo "$total_rss_mb"
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}
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# Function to clean old data from the temporary file.
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# It removes any entries older than the specified DURATION_HOURS
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# and also ensures the number of data points does not exceed terminal width.
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clean_old_data() {
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local current_timestamp=$(date +%s) # Get current Unix timestamp
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# Calculate the cutoff timestamp: current time minus the duration in seconds.
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local cutoff_timestamp=$((current_timestamp - DURATION_HOURS * 3600)) # 3600 seconds in an hour
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# First, filter data based on time.
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awk -F':' -v cutoff="$cutoff_timestamp" '$1 >= cutoff' "$DATA_FILE" > "${DATA_FILE}.tmp" && \
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mv "${DATA_FILE}.tmp" "$DATA_FILE"
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# Now, ensure the number of data points does not exceed terminal width.
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# Get current terminal columns.
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local current_columns=$(tput cols)
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# Estimate the width taken by the Y-axis label and padding.
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# " 999.9 MB |" is roughly 14 characters.
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local y_axis_label_width=14
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# Calculate maximum available columns for the chart data points.
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local max_chart_columns=$((current_columns - y_axis_label_width - 2)) # -2 for extra padding/border
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# Ensure a minimum number of columns to avoid negative values or very small charts.
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if [ "$max_chart_columns" -lt 10 ]; then
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max_chart_columns=10 # Ensure at least 10 columns for readability
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fi
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# Read the data again after time-based cleaning.
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local filtered_data=()
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while IFS=':' read -r timestamp mem_mb; do
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filtered_data+=("$timestamp:$mem_mb")
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done < "$DATA_FILE"
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local num_filtered_points=${#filtered_data[@]}
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# If the number of data points exceeds the maximum chart columns,
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# keep only the latest 'max_chart_columns' data points.
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if [ "$num_filtered_points" -gt "$max_chart_columns" ]; then
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local start_index=$((num_filtered_points - max_chart_columns))
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printf "%s\n" "${filtered_data[@]:$start_index:$max_chart_columns}" > "$DATA_FILE"
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fi
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}
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# Function to draw the ASCII line chart in the terminal.
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draw_chart() {
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local data=() # Array to store memory usage values
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local timestamps=() # Array to store corresponding timestamps
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local max_mem=0 # Maximum memory usage found in the current data
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local min_mem=9999999 # Minimum memory usage found (initialized high)
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# Read data from the file into the arrays and find min/max memory.
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while IFS=':' read -r timestamp mem_mb; do
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timestamps+=("$timestamp")
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data+=("$mem_mb")
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# Update max_mem if current value is higher.
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if (( $(echo "$mem_mb > $max_mem" | bc -l) )); then
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max_mem="$mem_mb"
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fi
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# Update min_mem if current value is lower.
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if (( $(echo "$mem_mb < $min_mem" | bc -l) )); then
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min_mem="$mem_mb"
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fi
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done < "$DATA_FILE"
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local num_data_points=${#data[@]} # Total number of data points to chart
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# If no data is available, print a message and exit the function.
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if [ "$num_data_points" -eq 0 ]; then
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echo "No data to display yet. Waiting for Chrome memory usage..."
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return
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fi
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# Adjust max_mem and min_mem for better chart scaling and padding.
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# Ensure a minimum range if memory usage is very low to prevent flat charts.
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if (( $(echo "$max_mem < 10" | bc -l) )); then
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max_mem=10
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fi
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# If min_mem is very close to max_mem, expand the range slightly for visibility.
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if (( $(echo "$max_mem - $min_mem < 5" | bc -l) )); then
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local avg_mem=$(echo "scale=2; ($max_mem + $min_mem) / 2" | bc)
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max_mem=$(echo "scale=2; $avg_mem + 2.5" | bc)
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min_mem=$(echo "scale=2; $avg_mem - 2.5" | bc)
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# Ensure min_mem doesn't go below zero.
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if (( $(echo "$min_mem < 0" | bc -l) )); then min_mem=0; fi
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fi
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# Calculate the total memory range for scaling.
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local mem_range=$(echo "scale=2; $max_mem - $min_mem" | bc)
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# Prevent division by zero if all memory values are identical.
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if (( $(echo "$mem_range == 0" | bc -l) )); then
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mem_range=1
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fi
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echo "Chrome Memory Usage (last ${DURATION_HOURS} hours)"
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echo "--------------------------------------------------"
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# Array to store the scaled vertical position (row index) for each data point.
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local scaled_positions=()
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for (( i = 0; i < num_data_points; i++ )); do
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local current_mem="${data[i]}"
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# Scale the current memory value to a position within the CHART_HEIGHT (0 to CHART_HEIGHT).
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local scaled_pos=$(echo "scale=0; ($current_mem - $min_mem) * $CHART_HEIGHT / $mem_range" | bc)
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scaled_positions+=("$scaled_pos")
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done
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# Draw the chart rows from top to bottom (highest memory level to lowest).
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for (( h = CHART_HEIGHT; h >= 0; h-- )); do
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local line=""
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# Calculate the memory level corresponding to the current row 'h'.
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local mem_level_label=$(echo "scale=1; $min_mem + ($mem_range * $h / $CHART_HEIGHT)" | bc)
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# Print the Y-axis label (memory level).
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LC_NUMERIC="C" printf "%6.1f MB |" "$mem_level_label"
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# Iterate through each data point to draw the chart line.
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for (( i = 0; i < num_data_points; i++ )); do
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# If the scaled position of the data point matches the current row 'h', print an asterisk.
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if [ "${scaled_positions[i]}" -eq "$h" ]; then
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line+="*"
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else
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line+=" " # Otherwise, print a space.
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fi
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done
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echo "$line"
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done
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# Draw the X-axis line.
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printf "%6s +%s\n" " " "$(printf -- "-%.0s" $(seq 1 "$num_data_points"))"
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# Draw X-axis labels (time).
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printf "%6s " " " # Indent for the labels.
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local first_timestamp=${timestamps[0]}
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local last_timestamp=${timestamps[num_data_points-1]}
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local start_time_str=$(date -d "@$first_timestamp" +%H:%M) # Format first timestamp
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local end_time_str=$(date -d "@$last_timestamp" +%H:%M) # Format last timestamp
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local mid_time_str=""
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local mid_len=0
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# Only show a middle label if there's enough horizontal space.
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if [ "$num_data_points" -gt 20 ]; then
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local mid_timestamp_index=$((num_data_points / 2))
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mid_time_str=$(date -d "@${timestamps[$mid_timestamp_index]}" +%H:%M)
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mid_len=${#mid_time_str}
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fi
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local start_len=${#start_time_str}
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local end_len=${#end_time_str}
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local total_label_width=$((start_len + mid_len + end_len))
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# Distribute labels based on available space.
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if [ "$total_label_width" -le "$num_data_points" ]; then
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# Enough space for all three labels (start, middle, end).
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local padding_before_mid=$(( (num_data_points - total_label_width) / 2 ))
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local padding_after_mid=$(( num_data_points - total_label_width - padding_before_mid ))
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printf "%s%*s%s%*s%s\n" \
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"$start_time_str" \
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"$padding_before_mid" " " \
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"$mid_time_str" \
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"$padding_after_mid" " " \
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"$end_time_str"
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else
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# Not enough space, just show start and end labels.
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local padding_between=$((num_data_points - start_len - end_len))
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if [ "$padding_between" -lt 0 ]; then padding_between=0; fi # Ensure padding is not negative.
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printf "%s%*s%s\n" "$start_time_str" "$padding_between" " " "$end_time_str"
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fi
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echo "" # Empty line for spacing.
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echo "Current Chrome Memory: $(get_chrome_memory_usage) MB"
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echo "Press Ctrl+C to exit."
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}
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# --- Main Loop ---
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# This loop runs indefinitely until interrupted (e.g., by Ctrl+C).
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while true; do
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tput clear # Clear the terminal screen before redrawing the chart.
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# 1. Get current Chrome memory usage.
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current_mem=$(get_chrome_memory_usage)
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current_timestamp=$(date +%s)
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# 2. Append the current timestamp and memory usage to the data file.
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echo "$current_timestamp:$current_mem" >> "$DATA_FILE"
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# 3. Clean up old data from the file to keep only the last DURATION_HOURS
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# and ensure it fits the terminal width.
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clean_old_data
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# 4. Draw the ASCII chart based on the current data.
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draw_chart
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# 5. Wait for the specified interval before the next update.
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sleep "$INTERVAL_SECONDS"
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done
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