Shell – annotate “include” file for grep with comments

grepshell

I do a grep sort that includes certain strings. That is, give me the lines in a file that DO contain certain strings. As in

grep -fv include file  > out

That command looks in file and sends to out every line that matches what is in the file include. No problem with that. Works fine.

BUT

How do I put comments in my include file?

For example, I'd like to annotate that file with some (e.g. #) comments that explain what I'm including. So I'd like for grep to ignore any lines in the include file that start with #. How do I do that?

Best Answer

With shells having process substitution like bash and zsh:

grep -f <(grep -v '^#' include) file > out

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First, note that you don't need the call to grep, by the way: it can be seamlessly integrated into the awk call.

<logfile awk '/endQuery/ {print $3 " " $1}'

You can filter out the banned queries at the awk stage. Store ongoing queries in an array, remove them if they're banned, and only print out the non-banned ones.

<logfile awk '
    $2 == "startQuery" {q[$1]=1}        # store the names of active queries
    q[$1] && /banned/ {delete q[$1]}    # delete banned queries
    $2 == "endQuery" {
        if (q[$1]) print $3, $1;        # only report non-banned queries
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    }
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Shell Grep Regular Expression – Escaping * with Regular Expressions and Grep

So try :

egrep "^\*\*" YOUR_FILE

Don't forget to use double quote.

Note: Use egrep instead of grep.
If you want to use grep use grep -E

Best Answer

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