I'm trying to efficiently parse vmstat output preferably in awk or sed, it also should work on both linux and hp-ux. For example I would like to cut cpu idle % ("92" in this case) from the following output:
$ vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
11 0 385372 101696 61704 650716 0 1 5 9 6 12 5 2 92 0
unfortunately the vmstat output can differ on different linux distributions and hp-ux, also columns can vary in length and can be presented in other order.
I tried to write some nice awk oneliner, but eventually ended with python solution:
$ vmstat | python -c 'import sys; print dict(zip(*map(str.split, sys.stdin)[-2:])).get("id")'
92
Do you know better way to parse mentioned output, to get number values of desired column name?
using awk you can do:
vmstat | awk '(NR==2){for(i=1;i<=NF;i++)if($i=="id"){getline; print $i}}'
This should get value of "id" column on Linux as well as on HP-UX or any other standard unix system.
Tested on Linux, HP-UX and Solaris.
$ vmstat | python -c 'import sys; print sys.stdin.readlines()[-1].split()[-2]'
95
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