vmps.sh - Report virtual memory status of a process.

vmps.sh

#!/usr/bin/env bash
#
# vmps.sh - Report virtual memory status of a process.
# Copyright (c) 2019 Koichi OKADA. All right reserved.
# This script distributed under the MIT license.
#

function vmps () # <pid> [<delay>]
# Report virtual memory status of a process.
# Args:
#   <pid>   : Process ID
#   <delay> : The delay between updates in seconds.
#             If delay is not specified, only one report will be printed.
{
  local i=0
  local cmdline
  shopt -s checkwinsize
  [ -e "/proc/$1" ] && sed -e 's/\x00/ /g' "/proc/$1/cmdline"
  while [ -e "/proc/$1" ]; do
    awk -v header="$i" '
      /^Vm/ {
        hdr=sprintf("%s%-10s", hdr, $1);
        mem=sprintf("%s%8d%s", mem, $2,$3);
      }
      END{
        if(header==0) print hdr;
        print mem;
      }
    ' /proc/$1/status
    let "i=(i+1)%(LINES-1)"
    [[ -n "$2" ]] && sleep "$2" || break
  done
}

[ "$(readlink -f -- "$0")" = "$(readlink -f -- "$BASH_SOURCE")" ] && {
  cat <<-EOD
	Usage:
	  source ${0##*/}
	$(grep ^function -A5 "$0" \
	| sed -re 's/^function\s+(\w*)\s*\(\)\s*#\s*(.*)/\1 \2/g;s/^/  /g')
	EOD
}