To expand on what Skrynesaver used in the code, the man page for egrep has this for egrep -v :
Quote:
-v, --invert-match
Invert the sense of matching, to select non-matching lines. (-v is specified by POSIX.)
So when you tried this:
egrep -v '^#' list_file
Egrep was told to search for all lines that did 'not' begin with a "#" character. Simply removing "-v" parameter would have allowed you to grep out the lines with hashes:
The "-v" parameter works the same way with grep. As you may notice Skrynesaver used -e instead which is used for pattern matching like '^#', but essentially this is the same thing without the "-v".
Just thought I would add this in case you wanted to understand this and know more about how grep and egrep work.
EDIT: Sorry, if this seems out of order. I believe you must have posted while I was typing this.
Last edited by Azrael; 02-09-2013 at 07:31 AM..
Reason: Explaining
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hi,
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COMMENT
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Discussion started by: arooonatr
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LEARN ABOUT SUSE
lzegrep
XZGREP(1) XZ Utils XZGREP(1)NAME
xzgrep - search compressed files for a regular expression
SYNOPSIS
xzgrep [grep_options] [-e] pattern file...
xzegrep ...
xzfgrep ...
lzgrep ...
lzegrep ...
lzfgrep ...
DESCRIPTION
xzgrep invokes grep(1) on files which may be either uncompressed or compressed with xz(1), lzma(1), gzip(1), or bzip2(1). All options
specified are passed directly to grep(1).
If no file is specified, then the standard input is decompressed if necessary and fed to grep(1). When reading from standard input,
gzip(1) and bzip2(1) compressed files are not supported.
If xzgrep is invoked as xzegrep or xzfgrep then egrep(1) or fgrep(1) is used instead of grep(1). The same applies to names lzgrep, lze-
grep, and lzfgrep, which are provided for backward compatibility with LZMA Utils.
ENVIRONMENT
GREP If the GREP environment variable is set, xzgrep uses it instead of grep(1), egrep(1), or fgrep(1).
SEE ALSO grep(1), xz(1), gzip(1), bzip2(1), zgrep(1)Tukaani 2009-07-05 XZGREP(1)