Shell Programming and Scripting

ABC
BCD
CDF
DEF
EFG

while read line
do
   my_var="$my_var, '$line'"
done < text_file

my_var="${my_var#, }"                # Trim off leading comma and space

echo "$my_var"

 awk -vs1="'" '{A=A?A OFS s1 $0 s1:s1 $0 s1} END{print A}' OFS=,  Input_file

 'ABC','BCD','CDF','DEF','EFG'

 awk -vs1="'" '{gsub(/^|$/,s1,$0);A=A?A OFS $0:$0} END{print A}' OFS=,  Input_file

sed -rn 's/^|$/\o047/g;1h;1!H;${x;s/\n/,/gp}' file

awk -vs1="'" '{gsub(/^|$/,s1,$0);A=A?A OFS $0:$0} END{print A}' OFS="\n" file