Shell Programming and Scripting

awk '{delete a; delete b; for(i = 1; i <= NF; i++) {a[i] = $i; b[$i]++}; for(i = 1; i <= length(a); i++) {if(b[$i] == 1) {printf "%s%s", a[i], FS}}; print ""}' file

delete a; delete b

for(i = 1; i <= NF; i++) {a[i] = $i; b[$i]++}

for(i = 1; i <= length(a); i++) {if(b[$i] == 1) {printf "%s%s", a[i], FS}}

printf "%s%s", a[i], FS

$ awk '{delete B;for(i=1;i<=NF;i++){if($i in B){$i=$(B[$i])=x}B[$i]=i}$0=$0;$1=$1}1' file

SEKK101 1C23.delay sequence=1 >>> sequence=0 >>>done.
SEKK106 1C22.delay sequence=1 >>> sequence=0 >>>done.
SEKK102 1C24.delay sequence=1 >>> sequence=0 >>>done.
SEKK101 1C20.delay sequence=1 >>> sequence=0 >>>done.
SEKK104 1C10.delay sequence=1 >>> sequence=0 >>>done.
SEKK104 1C11.delay sequence=1 >>> sequence=0 >>>done.
SEKK101 1C12.delay upThresh=10 >>> upThresh=11 >>>done.
SEKK101 1C15.delay thresHold=10 >>> thresHold=11 >>>done.
SEKK106 1C16.delay upThresh=10 >>> upThresh=11 >>>done.
SEKK106 1C17.delay thresHold=10 >>> thresHold=11 >>>done.
SEKK102 1C18.delay upThresh=10 >>> upThresh=11 >>>done.

$ awk '{delete a;for (i=1;i<=NF;i++) a[$i]++;for (i=1;i<=NF;i++) if (a[$i]==1) printf $i" ";printf "\n"}' file

awk '
{                              # For every line in file "file"
  for(i=1; i<NF; i++)          # Iterate variable "i" over the number of fields-1
    for(j=i+1; j<=NF; j++)     # Do the same for variable j from i+1 to the number of fields
      if($i==$j) $i=$j=x       # If two of these fields are equal then make their values ""
  $0=$0                        # Recalculate the fields, if previously fields were made equal to "" 
                                    #then there are now fewer fields..
  $1=$1                        # Recalculate the record, so that any amount of spacing between fields 
                                    # is converted to the OFS which is a single space.  
}
1                              # Print the record
' file                         # Read the file "file"