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Tidy; allow to run as non-root user #3

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4ff54f5
Allow to run as non-root; tidying
jean Mar 18, 2016
60909d6
Fix test to read proc info as non-root
jean Mar 20, 2016
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38 changes: 19 additions & 19 deletions memstat.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -6,27 +6,25 @@
# this shell script tries best to find more accurate results. Script use 2 files ie /proc//status (to get name of process)
# and /proc//smaps for memory statistic of process. Then script will convert all data into Kb, Mb, Gb.
# Also make sure you install bc command.


Source : http://www.linoxide.com/linux-shell-script/linux-memory-usage-program/
Parent : http://www.linoxide.com/guide/scripts-pdf.html

# Make sure only root can run our script
#
# Source : http://www.linoxide.com/linux-shell-script/linux-memory-usage-program/
# Parent : http://www.linoxide.com/guide/scripts-pdf.html
#

if [ "$(id -u)" != "0" ]; then
echo "This script must be run as root" 1>&2
exit 1
echo "Reporting memory usage only for the current user. Run as root to get usage for all processes." 1>&2
fi


### Functions
#This function will count memory statistic for passed PID
get_process_mem ()
{
PID=$1
#we need to check if 2 files exist
if [ -f /proc/$PID/status ];
#we need to check if 2 files exist (and are readable)
if test -r /proc/$PID/status && head -n 1 /proc/$PID/status 2>/dev/null 1>/dev/null;
then
if [ -f /proc/$PID/smaps ];
if test -r /proc/$PID/smaps && head -n 1 /proc/$PID/smaps 2>/dev/null 1>/dev/null;
then
#here we count memory usage, Pss, Private and Shared = Pss-Private
Pss=`cat /proc/$PID/smaps | grep -e "^Pss:" | awk '{print $2}'| paste -sd+ | bc `
Expand All @@ -48,7 +46,7 @@ then
fi
}

#this function make conversion from bytes to Kb or Mb or Gb
#this function make conversion from bytes to KB or MB or GB
convert()
{
value=$1
Expand All @@ -66,12 +64,12 @@ do
let power=$power+1
done

#this part get b,kb,mb or gb according to number of divisions
#this part get B,KB,MB or GB according to number of divisions
case $power in
0) reg=b;;
1) reg=kb;;
2) reg=mb;;
3) reg=gb;;
0) reg=B;;
1) reg=KB;;
2) reg=MB;;
3) reg=GB;;
esac

echo -n "${value} ${reg} "
Expand All @@ -83,7 +81,9 @@ echo -n "${value} ${reg} "
[[ -f /tmp/res3 ]] && rm -f /tmp/res3


#if argument passed script will show statistic only for that pid, of not � we list all processes in /proc/ #and get statistic for all of them, all result we store in file /tmp/res
# If argument passed, script will show statistics only for that PID, if not,
# we list all processes in /proc/ and get statistics for all of them.
# All result we store in file /tmp/res
if [ $# -eq 0 ]
then
pids=`ls /proc | grep -e [0-9] | grep -v [A-Za-z] `
Expand All @@ -100,7 +100,7 @@ fi
cat /tmp/res | sort -gr -k 5 > /tmp/res2

#this part will get uniq names from process list, and we will add all lines with same process list
#we will count nomber of processes with same name, so if more that 1 process where will be
#we will count number of processes with same name, so if more that 1 process where will be
# process(2) in output
for Name in `cat /tmp/res2 | awk '{print $6}' | sort | uniq`
do
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