memuse

#!/bin/sh
cd /proc 2>/dev/null || exit
printf "%10s %10s %10s %10s %10s %-15s %s\n" "pid" "ram (kB)" "swap (kB)" "total (kB)" "shm (kB)" "name" "cmdline"
for pid in [0-9]*; do
    cd "/proc/$pid" 2>/dev/null || continue
    rss=`cut -f2 -d' ' statm 2>/dev/null`
    test -z "$rss" && rss=0
    rss=$((rss*4))
    shared=`cut -f3 -d' ' statm 2>/dev/null`
    test -z "$shared" && shared=0
    shared=$((shared*4))
    ram=$((rss-shared))
    if grep -q '^VmSwap:' status 2>/dev/null; then
        swap=`sed -n 's/^VmSwap:\s*\(.*\)\s.*$/\1/p' status 2>/dev/null`
    elif grep -q '^Swap:' smaps 2>/dev/null; then
        swap=`sed -n 's/^Swap:\s*\(\S*\)\s*kB$/\1/p' smaps 2>/dev/null | tr '\n' '+' | sed 's/+$/\n/'`
        swap=$(($swap))
    fi
    if test -z "$swap"; then
        swap="unknown"
        total=$ram
    else
        total=$((ram+swap))
    fi
    if test -f comm; then
        name=`cat comm 2>/dev/null`
    elif grep -q '^\S*\s(\S*)\s' stat; then
        name=`sed 's/^\S*\s(\(\S*\))\s.*$/\1/' stat`
    else
        name=`readlink exe 2>/dev/null`
        if test -z "$name"; then
            name="unknown"
        else
            name=`basename $name`
        fi
    fi
    cmdline=`cat cmdline 2>/dev/null | tr '\000' ' '`
    printf "%10s %10s %10s %10s %10s %-15s %s\n" "$pid" "$ram" "$swap" "$total" "$shared" "$name" "$cmdline"
done | sort -k4 -n -r