awk Oddity?

[matonb]

GNU Awk 3.1.1 on a RHEL 3 U 5 server:

Simple little script to highlight disc partitions over 90% and 75%
Weirdness is that file partitions at 9% get highlighted yellow (green in example for clarity). If I "PCENT=9", then it works fine?

I used %s in the "Why is" statement to see if there was any whitespace lurking, but nothing other than 9 is printed...

The code (any suggestions for improvement welcome)

#!/bin/bash
df -PT | awk '
{
  if ($1!="Filesystem") {
    PCENT=substr($6, 1, length($6)-1)
    COL=0
    if (PCENT >= 90){
      printf "\033[1;31;40m";
      COL=1
    } else
    if (PCENT >= 75){
printf "Why is [%s] >= 75\n",PCENT;
      printf "\033[1;33;40m";
      COL=1
    }
    printf "%-28s %-6s %11d\t%11d\t%11d\t%7d%% %s\n", $1,$2,$3,$4,$5,PCENT,$7;
  }
  else printf "%-28s %-6s %s\t%11s\t%11s\t%s %s %s\n", $1,$2,$3,$4,$5,$6,$7,$8;
  if (COL=1) printf "\033[0;m"}
'

Filesystem                   Type   1024-blocks        Used       Available     Capacity Mounted on
/dev/vg00/lv00               ext3       1032088      157508          822152          17% /
Why is [9] >= 75
/dev/cciss/c0d0p1            ext3        126419       10341          109551           9% /boot
/dev/vg00/lv01               ext3        507748       12099          469435           3% /home
/dev/vg00/lv06               ext3      20642428     1332012        18261840           7% /opt
none                         tmpfs      2015504           0         2015504           0% /dev/shm
/dev/vg00/lv02               ext3       1588452       32820         1474944           3% /tmp
Why is [9] >= 75
/dev/vg00/lv03               ext3       3096336      246728         2692324           9% /var
/dev/vg00/lv04               ext3       2064208      835108         1124244          43% /usr

[burschik]

No oddities here. PCENT is a string. You need to use int(PCENT) if you are going to do numerical comparisons.

[matonb]

Thanks burschik,

I wrapped it around the substr statement.
Getting to used to those untyped languages

Works a treat now.

[secondmouse]

Using FS in the BEGIN block can save you some codes:

#!/bin/bash
df -PT | awk '
BEGIN { 
        FS="[% ]+"
}
{
        if ($5>=90&&NR>1)
        {
              printf "\033[1;31;40m%s\033[0;m\n",$0;
        }
        else
        {
                if($5 >=75&&NR>1)
                {
                printf "\033[1;33;40m%s\033[0;m\n",$0;
                }
                else printf "%s\n",$0;
        }
}
'