Delete All lines having this expression Post: 302080121

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delete lines matching a regular expression

I have a very large file (over 700 million lines) that has some lines that I need to delete. An example of 5 lines of the file: HS4_80:8:2303:19153:193032 153 k80:138891 HS4_80:8:2105:5544:43174 89 k88:81949 165 k88:81949 323 0 * = 323 0 ...

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Finding lines with a regular expression, replacing them with blank lines

So the tag for this forum says all newbies welcome... All I want to do is go through my file and find lines which contain a given string of characters then replace these with a blank line. I really tried to find a simple command to do this but failed. Here's what I did come up with though: ...

LEARN ABOUT DEBIAN

jlessecho

LESSECHO(1)						      General Commands Manual						       LESSECHO(1)

NAME

       lessecho - expand metacharacters

SYNOPSIS

       lessecho [-ox] [-cx] [-pn] [-dn] [-mx] [-nn] [-ex] [-a] file ...

DESCRIPTION

       lessecho is a program that simply echos its arguments on standard output.  But any argument containing spaces is enclosed in quotes.

OPTIONS

       A summary of options is included below.

       -ox    Specifies "x" to be the open quote character.

       -cx    Specifies "x" to be the close quote character.

       -pn    Specifies "n" to be the open quote character, as an integer.

       -dn    Specifies "n" to be the close quote character, as an integer.

       -mx    Specifies "x" to be a metachar.

       -nn    Specifies "n" to be a metachar, as an integer.

       -ex    Specifies "x" to be the escape char for metachars.

       -fn    Specifies "n" to be the escape char for metachars, as an integer.

       -a     Specifies that all arguments are to be quoted.  The default is that only arguments containing spaces are quoted.

SEE ALSO

       less(1)

AUTHOR

       This manual page was written by Thomas Schoepf <schoepf@debian.org>, for the Debian GNU/Linux system (but may be used by others).

       Send bug reports or comments to bug-less@gnu.org.

							     Version 394: 03 Dec 2005						       LESSECHO(1)

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