如何在shell脚本中使用带引号的grep？

Question

I am trying to use the following pattern inside a shell script eg. I want to use the following:

grep ^"#" $fn | grep -v NM$ > $op

but inside bash script. The problem is normally bash considers everything after the "#" as a comment. If i use

grep ^"\#" $fn

I think it changes the meaning. I am a newbie.

Any help will be appreciated.

Answer 1

There are multiple possibilities:

grep '^#' $fn

or

grep "^#" $fn

or

grep ^\# $fn

Answer 2

Here is a little example which I saved as foo.sh

echo "#"
echo '#'  # this is a comment
echo '\#'

when run as sh foo.sh this is what is printed out

#
#
\#