Different Methods to Print Single Quote (') in AWK programming

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This is my input file

cat dat

NO         TAG20111217T004155

YES        TAG20111217T004157

YES        TAG20111217T004157

I want the output in following format

'TAG20111217T004155'

'TAG20111217T004157'

'TAG20111217T004157'

Method 1:

awk -v rep="'"  '{ print  q $2 q}' dat

TAG20111217T004155

TAG20111217T004157

TAG20111217T004157

Method 2:

awk -v rep="'"  '{ print  rep $2 rep}' dat

'TAG20111217T004155'

'TAG20111217T004157'

'TAG20111217T004157'

Method 3:

$ awk '{ print  "'"'"'" $2 "'"'"'" }' dat

'TAG20111217T004155'

'TAG20111217T004157'

'TAG20111217T004157'

Method 4:

awk '{ print "'\''" $2 "'\''" }' dat

'TAG20111217T004155'

'TAG20111217T004157'

'TAG20111217T004157'

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