dfからの出力を読みやすくする

#!/bin/sh
#newdf.sh

awkscript="/tmp/newdf.sh.$$"

#trap "rm -f awkscript" EXIT

cat << 'EOF' > $awkscript
function showunit(size)
{ mb = size / 1024; prettymb=(int(mb * 100)) / 100;
  gb = mb / 1024; prettygb=(int(gb * 100)) / 100;

  if ( substr(size,1,1) !~ "[0-9]" ||
       substr(size,2,1) !~ "[0-9]" ) { return size }
  else if ( mb < 1 ) { return size "K" }
  else if ( gb < 1 ) { return prettymb "M" }
  else               { return prettygb "G" } 
}

BIGIN {
    printf "%-27s %7s %7s %7s %8s %-s\n","Filesystem",
        "Size", "Used", "Avail", "Capacity", "Mounted"
}

!/Filesystem/ {

    size=showunit($2);
    used=showunit($3);
    avail=showunit($4);

    printf "%-27s %7s %7s %7s %8s %-s\n",
        $1, size, used, avail, $5, $6
}
EOF

df -k | awk -f $awkscript

exit 0