UNIX for Beginners Questions & Answers

cat path/to/dir/file.html | grep -i 'x*.com' > path/to/dir/file.txt

Before
xyz.com 
xyz.com

After 
cat path/to/dir/file.html | grep -i 'x*.com' |  sed '$!s/$/,/' | tr -d '\n'> path/to/dir/file.txt

Result --> Preferred
output:
xyz.com, xyz.com

awk -v str='x*.com' '$1~str && !a[$1]++' myFile

xyz.com
xyz.com
1xyz.com
123.com

$ awk -v str='x*.com' '$1~str && !a[$1]++' myFile
xyz.com
1xyz.com
123.com

grep -i '^x.*\.com$' file.html | sed -e ':L' -e '$!N;s/\n/, /;tL'