## Interface Control Definition for System ${sys}
## ${ICD}: Generated by MTT `date`

EOF

cat ${icd}		|\
    sed 's/[\,\;]/\ /g'	|\
    gawk '
    ($2 != "null" && $6 == "input")  { printf ("Input:  %-30s %-30s Causality: Effort   Units: %s\n", $2, $1, $3) }
    ($4 != "null" && $7 == "input")  { printf ("Input:  %-30s %-30s Causality: Flow     Units: %s\n", $4, $1, $5) }
    ($2 != "null" && $6 == "output") { printf ("Output: %-30s %-30s Causality: Effort   Units: %s\n", $2, $1, $3) }
    ($4 != "null" && $7 == "output") { printf ("Output: %-30s %-30s Causality: Flow     Units: %s\n", $4, $1, $5) }
    ' | sort >> ${ICD}