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awk -F"kw01"|use the string kw01 as field separator
'NF>1|if the number of field is greater than 1 (so in fact it is like "if the kw01 string is found in the line")
{printf "%s",$1;|display the...

If you are on SunOS / Solaris, replace "awk" with "nawk"

I used the BEGIN section to load the contents of your file into a string variable, using getline with the filename passed in from the shell via the f variable. I used standard pattern matching...