Return total memory usage of processes by name

mem.complete.sh

#!/bin/bash

###
# Save as /etc/bash_completion.d/mem.complete.sh
##

_complete_mem() {
  commands=`ps --no-headers -e -o command | grep -Eo "^[a-zA-Z0-9_\.\-\/]+" | { while read line; do basename $line; done;  } | sort -u`
  current="${COMP_WORDS[COMP_CWORD]}"
  COMPREPLY=( $(compgen -W "${commands}" "${current}") )
}

complete -F _complete_mem mem.sh

mem.sh

#!/bin/bash

###
# Save as ~/bin/mem.sh
##

selfname=`basename $0`
name=$1

if [ -z "${name}" ]; then
  echo -e "Display process total memory usage in kilobytes\n"
  echo -e "Usage: ${selfname} NAME\nWhere:"
  echo -e "  \e[1mNAME\e[0m is process name (used as argument for pgrep)"
  exit 0
fi

pids=`pgrep "${name}"`

if [ -z "${pids}" ]; then
  echo -e "pids of ${name} is not found. test you process name: \e[1mpgrep ${name}\e[0m."
  exit 0
fi

pidsCom=`echo "${pids}" | paste -sd "," -`

rssRaw=`ps --no-headers -p "${pidsCom}" -o rss`
rssSum=`echo "$rssRaw" | paste -sd "+" -`
rssTotal=$(($rssSum))

echo "${rssTotal} Kb"