Shell Programming and Scripting

Mem: 100 100 100 100
Swap: 100 100 100 100

# awk rule using default FS
$1 == "Swap:" { # do something
                     }
# or
{
      if ( $1 == "Swap:" ) {
             # do something
             }

}

while read key val1 val2 val3 val4 valxxx
do
             case "$key" in
                   Swap:) #do_some 
                              ;;
                    Mem:) #do_some 
                              ;;
             esac
done < inputfile

free -m:|egrep 'Mem|Swap' | awk '{ print $1, $2, $3, $4} > file.out

Mem: 1001 800 200
Swap: 2015 98 1917

awk '{
printf "$1 $2 $3 $4 are " $1 " " $2 " " $3 " " $4 "\n" #(this is my debug statement)
if ($1 == "Swap:" && $3 != 0)  # I comment out the && and it's the $1 failing for sure
  printf "WARNING - SWAP IN USE \n"
else
  some other checks which all work fine...
}' file.out >> health_check.out
cat health_check.out #another debug, actually I've got a mailx built here

$1 $2 $3 $4 are Mem: 1001 800 200
Output for falling through the if statement
$1 $2 $3 $4 are Swap: 2015 98 1917

free -m | awk '/^Swap/ && $3 != 0 {print "Swap in use"}'
Swap in use