Only use awk to Remove invalid information such as comments in the configuration file.

Only use awk to Remove invalid information such as comments in the configuration file.

Question: Only awk is used to remove comments and empty lines from the configuration file;

Note: 1. the configuration file comment is # Start, end to the end of the line, and is similar to the comment in shell;

2. comments, including comments at the beginning and end of the line;

3. blank lines, including lines containing only line breaks and blank lines;

 

Solution:

1. Only remove comments, end comments, and blank lines:

 

Awk-F' # ''($1) {print $1} 'xxx. conf

2. You can only remove comments from lines, comments at the end of a line, empty lines, and blank lines:

Awk-F #'{($1 & $1 !~ /^ [[: Blank:] * $/) {print $1} 'xxx. conf

Equivalent method:

Awk-F' #''($1 & $1 !~ /^ [\ T] * $/) {print $1} 'xxx. conf

3. Add the row number in the original configuration file for each valid row:

Awk-F' #''($1 & $1 !~ /^ [[: Blank:] * $/) {print NR, $1} 'xxx. conf