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If running a script from a file like you did, you can't have the awk ' (opening) and final ' (closing) construct in the file. Try without.

awk '!/ABC/{c=0}/ABC/{$0=$0"_"++c}1' file

perl -nle 'm{((\d+/){2}\d+)} and $d=$1 or print "$d,$_"' ks_reddy.csv
03/25/2016,A,B,C
03/25/2016,D,E,F
03/26/2016,1,2,3
03/26/2016,4,5,6
03/27/2016,6,4,3
03/27/2016,4,5,6

Can be done in EXCEL pretty simple and fast. However, try awk '/^date/ {T = $2; next} {print T, $0}' OFS="," file1
03/25/2016,A,B,C
03/25/2016,D,E,F
03/26/2016,1,2,3
03/26/2016,4,5,6...

try also:
awk -F, 'NR==FNR {if ($2 !~ /./) a[$1]=1; next;} ! a[$1] ' inputfile.csv inputfile.csv > output.csv

Or awk '{printf "%s %d\n", $0, p+=$1==0}' file
0 1
1 1
2 1
3 1
0 2
3 2
4 2
5 2
6 2
0 3
1 3
2 3
3 3
or even awk '{print $0, p+=$1==0}' file

As I am sure you already know, sed doesn't do arithmetic...
Try:
awk '
$1 == 0{ pat++ }
{ printf("%s %d\n", $0, pat) }
' data
If you want to try this on a Solaris/SunOS system, change awk to...

With a million lines of input (assuming adjacent timestamps represent monotonically increasing times [even though only minutes and seconds are given] and assuming that there is at least one entry...

$ awk -F ":" 'FNR==1{ti=$1*60+$2}
{s=0}
$1=="00"{s=3600;}
{print ($1*60+s+$2-ti)}' file

0
0.2
0.5
0.7
1
1.2
1.5

awk -F ':' 'FNR==1 {minutes=$1; old=$1; sec=$2; start=(minutes*60) +sec}
{$old!=$1} {minutes++; old=$1}
{print (minutes*60 + $2) - start } ' infile

Start with...

sed '1d; s/PATTERN/REPLACEMENT/' filename

sed '2,$s/PATTERN1/PATTERN2/' filename
awk 'NR==1{print}NR>1{sub(/PATTERN1/,"PATTERN2");print}' filename

Try sed '1 ! s/pattern/replacement/' file

Ow, yes.. I took it the . lines were meant to represent the missing intermediate values...

You'll need a small extra-tweak to leave the dot-lines (.) unchanged:

awk 'NR>1&&!/^\./{if($1<p)c++; p=$1; $0=sprintf( "%c", 65+c) $0}1' infile

If you save the following in a file named dropheaders and make it executable, have a file named input that contains the data, and a file named exclude that contains the list of headers to skip:...

you can avoid temp files but not temp file.
you have to use atleast one temp file.

try

awk -F, '$1==A{$2+=1}1' OFS="," file > temp
mv temp file

Try:

awk -F, '$2%2{$2++}1' OFS=, infile > outfile

awk -F, 'NR==1{for(i=1;i<=NF;i++){if($i=="StepNo")x=i;}} NR>1{if($x=="1")print;}' input_file