topmem.sh

#!/bin/bash

# Get total system memory
TOTAL_MEM=$(sysctl -n hw.memsize)

# 1. ps: Get data
# 2. awk1: Calculate sums and output raw data with "|" delimiter (PCT|MB|NAME)
# 3. sort: Sort numerically by the first column (PCT)
# 4. awk2: Format the table and add headers

ps -axo rss,command | awk -v total_mem=$(sysctl -n hw.memsize) '
    NR == 1 { next }
    {
        rss = $1
        # Get the full command path (everything after the first column)
        cmd = substr($0, index($0,$2))
        
        # Split path by "/" to find the component ending in .app
        n = split(cmd, parts, "/")
        name = parts[n] # Default to the executable name (last part)
        
        for (i=1; i<=n; i++) {
            if (parts[i] ~ /\.app$/) {
                name = parts[i]
                sub(/\.app$/, "", name) # Remove .app suffix
                break
            }
        }
        
        mem[name] += rss
    }
    END {
        # output: PCT MB NAME (Numeric first guarantees correct sorting)
        for (name in mem) {
            pct = (mem[name] * 1024 / total_mem) * 100
            mb = mem[name] / 1024
            if (pct > 0.1) {
                print pct, mb, name
            }
        }
    }
' | sort -rn | awk '
    BEGIN {
        printf "%-30s %10s %9s\n", "APP / PROCESS", "MB USED", "% MEM"
        print "----------------------------------------------------"
    }
    {
        pct = $1
        mb = $2
        
        # Reconstruct name from $3 onwards to handle spaces like "Google Drive"
        name = substr($0, index($0,$3))
        
        # Truncate very long names to keep table aligned
        if (length(name) > 25) name = substr(name, 1, 23) ".."
        
        printf "%-30s %10.1f %8.2f%%\n", name, mb, pct
    }
'