Swappy :: Calculate swap usage for each PID in Linux

swappy.sh

#!/usr/bin/env bash
## Usage: swappy [-t|--total]
## Identify the processes that use swap

# Usage
test "$1" = "-h" -o "$1" = "--help" && {
  grep '^##' <"$0" | cut -c4-
  exit 2
}

# Color check
if [ -t 1 ]; then
  ncolors=`tput colors`
  if test -n "$ncolors" && test $ncolors -ge 8; then
    RED=`tput setaf 1`
    GREEN=`tput setaf 2`
    YELLOW=`tput setaf 3`
    BLUE=`tput setaf 4`
    MAGENTA=`tput setaf 4`
    CYAN=`tput setaf 6`
    RESET=`tput sgr0`
  fi
fi

# Main
total_swap=0
printf "%-8b      %8b    %-b\n" "${MAGENTA}PID" "SWAP" "CMD${RESET}"
for pid in $(ls -d /proc/*/smaps| cut -f3 -d'/' | egrep '[0-9]+$'); do
  pid_cmd=$(cat /proc/$pid/cmdline 2>/dev/null|tr '' ' ')
  pid_swap=$(awk 'BEGIN{total=0}/Swap/{total+=$2}END{print total}' /proc/$pid/smaps 2>/dev/null)
  if [ "$pid_swap" != '' ] && [ "$pid_swap" -gt 0 ]; then
    printf "%-8d %6d KB   %-s\n"  "$pid" "$pid_swap" "$pid_cmd"
    let total_swap+=$pid_swap
  fi
done
if [ "$1" = "-t" -o "$1" = "--total" ]; then
  printf "Total:    %4b KB\n" "${RED}${total_swap}${RESET}"
fi