AWK with one decimal place

Question

My current script is giving output with many decimal places. Is there any way to get only 1 place in the output?

# cat sample
HDD Used: 15.0223T
HDD Total: 55.9520T

# cat sample | awk ' /HDD Total/ { hdd_total=$NF }
      /HDD Used/ { hdd_used=$NF }
      END {
        used=hdd_total-hdd_used
        print "cal =" used}'

Current Output

cal =40.9297

Required output
cal =40.9 ---> With only one decimal

Getting error for this

# isi storagepool list -v| grep -i 'HDD Total:' | awk '{print "HDD Total=%.1f", $NF -1 " TB" }'
HDD Total=%.1f 54.952 TB
#cat isistorage1 
7.332T     n/a (R)   13.01% (T)

# cat isistorage1 |  awk '{ print "Snapshot USED=", $1}'
Snapshot USED= 7.332T

score 10 · Accepted Answer · edited Aug 02 '17 at 09:58

10

You can use printf "cal =%.1f\n", used instead since it has print type modifier control and area.

The .1f there means, only print 1 decimal place after a floating point, you can change it to any number you want in decimal places.

edited Aug 02 '17 at 09:58

Archemar

31,554

answered Aug 02 '17 at 08:29

αғsнιη

41,407

this is not working for this awk '{ printf "Snapshot USED=%.1f\n" $1}' – Shanker Aug 02 '17 at 10:01
added the error to the question. – Shanker Aug 02 '17 at 10:03
what value the $1 has taken in your awk command? it's a floating point value? what this command tail -n -1 | gives in output in your command? – αғsнιη Aug 02 '17 at 10:10
1

@Shanker: $1 should be an argument to printf add a comma and it should work – Thor Aug 02 '17 at 10:17
i tried the same but still unable to do so. – Shanker Aug 02 '17 at 11:05
@shanker make sure you're using printf, not print – Jeff Schaller Aug 02 '17 at 14:02

score 3 · Answer 2 · answered Aug 02 '17 at 10:20

You can tell awk which floating-point conversion to use by setting CONVFMT, the default is %.6g, e.g.:

cat sample | awk -v CONVFMT='%.1f' '
/HDD Total/ { hdd_total = $NF }
/HDD Used/  { hdd_used  = $NF }
END {
  used=hdd_total-hdd_used
  print "cal = " used
}'

Output:

cal = 40.9

AWK with one decimal place

2 Answers2

Linked