Problem with read variable from AWK
I’m trying to get memory info by this command:
#!/bin/bash
set -x
cat /proc/meminfo | grep "MemFree" | tail -n 1 | awk '{ print $2 $4 }' | read numA numB
echo $numA
I’m getting this
+ awk '{ print $2 $4 }'
+ read numA numB
+ tail -n 1
+ grep MemFree
+ cat /proc/meminfo
+ echo
My attempts to read these data to variable were unsuccessful. My question is how I can read this to variables? I want to read how many memory is free like: 90841312 KB
Try saving single values directly to each variable. You can also remove the cat and the tail pipe by using the -m flag with grep:
numA=$(grep -m 1 "MemFree" /proc/meminfo | awk '{ print $2 }')
numB=$(grep -m 1 "MemFree" /proc/meminfo | awk '{ print $3 }')
echo $numA $numB
You can use read and simply do the following
while read -r memfree
do printf '%sn' "$memfree"
done < <(awk -F: '/MemFree/{print $2}' /proc/meminfo)