Shell Programming and Scripting

user=test1 group=test1 ctime=1411615875 qtime=1411615875 etime=1411615875 start=1411615876 resources_used.mem=390792kb resources_used.vmem=8844720kb resources_used.walltime=8

user=test1 resources_used.walltime=8
user=test1 resources_used.walltime=9
user=test2 resources_used.walltime=6
...........

sed -e 's/ .* / /'

{
  U = R = "";
  for (i = 1; i <= NF; i++) { 
     if ($i ~ /^user=/) U = $i;
     if ($i ~ /^resources_used.walltime=/) R = $i;
  }
  print U, R;
}

$ cat infile
user=test1 group=test1 ctime=1411615875 qtime=1411615875 etime=1411615875 start=1411615876 resources_used.mem=390792kb resources_used.vmem=8844720kb resources_used.walltime=8

awk -F'[ =]' '{s="";for(i=1;i<=NF;i+=2)if($i ~ /user|resources_used.walltime/){s = s ( s ? OFS :"") $i "=" $(i+1)}; if(s)print s }' infile
user=test1 resources_used.walltime=8

$ cat test.awk
BEGIN{
        # Add or remove field if required
	parse="user,resources_used.walltime"
	n=split(parse,P,/,/)
}
{
	s = ""
	for(i=1; i<=n; i++)
	{
		s  = s ( s ? OFS : "") ( match($0,P[i]"=[^ ]*") ? substr($0,RSTART,RLENGTH) : "NaN" )
	}
	if(s)print s
}

$ awk -f test.awk infile
user=test1 resources_used.walltime=8