CODEWITHSUNDEEP
bashshellawk
3urdoch
3urdoch

Reputation: 7332

Bash string replace on command result

I have a simple bash script which is getting the load average using uptime and awk, for example

LOAD_5M=$(uptime | awk -F'load averages:' '{ print $2}' | awk '{print $2}')

However this includes a ',' at the end of the load average

e.g.

0.51,

So I have then replaced the comma with a string replace like so:

LOAD_5M=${LOAD_5M/,/}

I'm not an awk or bash wizzkid so while this gives me the result I want, I am wondering if there is a succinct way of writing this, either by:

Upvotes: 2

Views: 223

Answers (4)

hek2mgl
hek2mgl

Reputation: 158060

The 5 min load is available in /proc/loadavg. You can simply use cut:

cut -d' ' -f2  /proc/loadavg

With awk you can issue:

awk '{print $2}' /proc/loadavg

If you are not working on Linux the file /proc/loadavg will not being present. In this case I would suggest to use sed, like this:

uptime | sed 's/.*, \(.*\),.*,.*/\1/'

Upvotes: 1

pjh
pjh

Reputation: 8134

The load average numbers are always the last 3 fields in the 'uptime' output so:

IFS=' ,' read -a uptime_fields <<<"$(uptime)"
LOAD_5M=${uptime_fields[@]: -2:1}

Upvotes: 0

anubhava
anubhava

Reputation: 785296

You can do that in same awk command:

uptime | awk -F 'load averages?: *' '{split($2, a, ",? "); print a[2]}'
1.32

Upvotes: 2

jas
jas

Reputation: 10865

uptime | awk -F'load average:' '{ print $2}' | awk -F, '{print $2}'
0.38

(My uptime output has 'load average:' singular)

Upvotes: 0

Related Questions