SED help delete characters in a string

Shell Programming and Scripting
1

Hi Please help me to refine my syntax. I want to delete the excess characters from the out put below.

-bash-3.00$ top -b -n2 -d 00.20 |grep Cpu|tail -1 | awk -F ":" '{ print $2 }' | cut -d, -f1
  4.4% us

now i want to delete the % and us. How wil i do that to make it just 4.4.

Thanks

2

can you just post the output -- or just the output of

 
top -b -n2 -d 00.20 |grep Cpu
3

I'm getting the output of 4.4% us.

I need to remove the % us to make it just 4.4 for the output.

What will i add from this syntax to delete the % and us

top -b -n2 -d 00.20 |grep Cpu|tail -1 | awk -F ":" '{ print $2 }' | cut -d, -f1

the syntax above outputs 4.4% us

Thanks

4

i understand your question. there is unnecessary of grep,tail,cut command

you can easily do all these things in awk itself, thats why i am asking the output

5

I see. But can you help me itkamaraj?

thanks

6 
 
$ nawk -F"[:%]" '/Cpu/ {print $2}' test
0.0
$ cat test
top - 16:56:36 up 246 days, 11:14,  3 users,  load average: 0.00, 0.00, 0.00
Tasks: 168 total,   1 running, 167 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   8306856k total,  7940744k used,   366112k free,   285136k buffers

so, in your case, it should be

 
top -b -n2 -d 00.20 | nawk -F"[:%]" '/Cpu/ {print $2}'
7

Thank you very much itkamaraj!!!

8

try this:

top -b -n2 -d 00.20 | grep Cpu |awk -F"[:%]" 'END{print $2}'