i have a question about how to store the output into variable and then later pipeline into another command
var=$(ps -auxc | grep -vE '^USER' )
#get top CPU
echo $var | sort -nr -k3 | head -1
#get top memory
echo $var | sort -nr -k4 | head -1
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1What's the question here?Etan Reisner– Etan Reisner2014-07-09 17:55:13 +00:00Commented Jul 9, 2014 at 17:55
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2 Answers
Make sure to use quotes in assignment and while accessing variable:
var="$(ps -auxc | grep -vE '^USER')"
#get top CPU
sort -nr -k3 <<< "$var" | head -1
#get top memory
sort -nr -k4 <<< "$var" | head -1
3 Comments
konsolebox
I don't think using
"" on assignments would give a difference. For the answer however, it's quite enough if the user is not too sensitive about the last newline as $() always chops it out.
anubhava
@konsolebox: Yes that's right, while assigning
"" may not be necessary.anubhava
@user3821571: Consider accepting any of the answers your liked here.
I'm not sure if this would always work:
IFS= read -rd '' var < <(ps -auxc | grep -vE '^USER') ## -d '' may be -d $'\0'
echo -n "$var" | sort -nr -k3 | head -1
However using readarray could:
readarray -t var < <(ps -auxc | grep -vE '^USER')
printf '%s\n' "${var[@]}" | sort -nr -k4 | head -1
