Show total memory and swap for all processes matching a pattern, e.g. `procmem firefox`

procmem

#!/bin/bash

pat="$1"

pids=$(
	find /proc/* -maxdepth 1 -name exe -printf "%p\t%l\n" 2>&- \
	| grep "$pat" \
	| perl -pe 's|^/proc/(\d+)/exe.*$|$1,|g;' \
	| tr -d \\n
)

status=$(mktemp -p /tmp procmem.XXXXXXXX)

eval cat /proc/{${pids%,}}/status > $status 2>/dev/null
rssize=$(grep VmRSS  $status | awk '{print $2 "+"}' | tr -d \\n)
vmsize=$(grep VmSize $status | awk '{print $2 "+"}' | tr -d \\n)
vmswap=$(grep VmSwap $status | awk '{print $2 "+"}' | tr -d \\n)

to_human_num() {
    local suf=KiB
    local val=$1 || return 1
    local ival=$(echo "scale=0; $val / 1" | bc -l)

    if (( ival > 1024 )); then
	val=$(echo "$val / 1024" | bc -l)
	ival=$(echo "scale=0; $val / 1" | bc -l)
	suf=MiB
    fi

    if (( ival > 1024 )); then
	val=$(echo "$val / 1024" | bc -l)
	ival=$(echo "scale=0; $val / 1" | bc -l)
	suf=GiB
    fi

    if (( ival > 1024 )); then
	val=$(echo "$val / 1024" | bc -l)
	ival=$(echo "scale=0; $val / 1" | bc -l)
	suf=TiB
    fi

    local fmt
    if (( ival < 10 )); then
	fmt="%3.2f"
    elif (( ival < 100 )); then
	fmt="%3.1f"
    else
	fmt="%3.0f"
    fi

    printf "${fmt}%s" "$val" ${suf::1}
}

printf "rss\tvmswap\ttotal\tprocess\n"
printf "%s\t%s\t%s\t%s\t%s\n" \
       $(to_human_num $(echo "${rssize%+}" | bc -l)) \
       $(to_human_num $(echo "${vmswap%+}" | bc -l)) \
       $(to_human_num $(echo "${rssize%+}+${vmswap%+}" | bc -l)) \
       "$pat"
rm $status

This is a little bash script I wrote to quickly see how much memory my browser is using, as it will have many processes. It might work under sh, but I haven't tested it. It expects a Linux /proc file system and requires find, awk, perl, bc, grep, and tr. Yes, the whole thing could be rewritten as a perl script, C program or whatever, but here it is.

$ procmem firefox-bin
rss     vmswap  total   process
6.13G   1.87G   8.00G   firefox-bin