[SOLVED] ","(shift+<) doesn't work as a IFS in my code!

massy · 03-03-2014, 08:04 AM

I need to two first columns of uptime command so it's delimiter should be ","(shift+<) this code work correctly when IFS=":"!!!

Code:

utime=`uptime`
read d t rest<<<$(IFS=",";echo $utime)
echo $d $t

szboardstretcher · 03-03-2014, 08:10 AM

First off,.. what is your original 'uptime' output. And also, what distro are you using?

Because it should work.

Code:

[root@dev ~]# read d t rest<<<$(export IFS=',';echo $utime)
[root@dev ~]# echo $d $t
09:05:43 up

as does this:

Code:

uptime|awk {'print $1 " " $2'}

grail · 03-03-2014, 10:04 AM

hmmm ... I would suggest the awk is possibly missing something, like a change of delimiter

As for the command line, no need to over-think it:

Code:

$ IFS="," read d t _ <<<"$(uptime)"
$ echo $d $t
23:58:05 up 9 days 23:06

This is correct output as my uptime format is:

Code:

00:00:39 up 9 days, 23:09,  0 users,  load average: 0.00, 0.06, 0.52

So commas are not really helpful in mine, so hopefully will get better output with yours

NevemTeve · 03-03-2014, 11:03 AM

Try it in little steps:

Code:

read NOW UP UPTIME REST <<<$(uptime)
UPTIME=${UPTIME%,*}
printf 'NOW=%s UPTIME=%s\n' "$NOW" "$UPTIME"