UNIX for Advanced & Expert Users

^[^\r\n#]+[\r\n]

^[^\r\n#]*[\r\n]

grep -e '^[^#]*$' testhash.txt

line1 has some text
line2 is a second line
li#e3 has a hash!
line4 the above line had a hash!
line# has a hash too
line6 - ^ had a hash.. bad line?
#ine7 hashline
line8 lastly the last line
#

line11 single hash and a blank line above

line1 has some text
line2 is a second line
line4 the above line had a hash!
line6 - ^ had a hash.. bad line?
line8 lastly the last line

line11 single hash and a blank line above

$ cat infile
# This is a test
echo hello # partial test

echo the line above contains tabs and spaces

echo the line above is empty
  echo "just want to print an #i character" ffsf
$ grep -e '^[^#]*$' infile

echo the line above contains tabs and spaces

echo the line above is empty
$ awk 'NF && $1!~/^#/' infile
echo hello # partial test
echo the line above contains tabs and spaces
echo the line above is empty
  echo "just want to print an #i character" ffsf
$