Vi delete line with second occurence of pattern Post: 302939780

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Top Forums UNIX for Dummies Questions & Answers Vi delete line with second occurence of pattern Post 302939780 by Don Cragun on Saturday 28th of March 2015 10:53:12 PM

03-28-2015

Registered User

Quote:

Originally Posted by durden_tyler

Just a quick note - you can run Don's awk script inside the vi/vim editor.
Essentially, you can run any command of the OS on which your vi/vim editor was installed.

Code:

:%!awk 'f[$0]++ == 0'

"%" ==> set the entire file as the range on which the awk command will run
"!" ==> run the command of the underlying OS.
"awk 'f[$0]++ == 0' ==> the actual OS command; the "input_file" isn't required here

Once you hit Enter, your duplicate data will be removed within the editor window itself. You can then simply save it. This obviates the need for the temp file.

If you're in the editor to make other changes to the file anyway, this is a great idea. But, it doesn't get rid of the need for a temp file; it just has vi create the temp file instead of the user creating it explicitly. In fact, there is a good chance that vi (or vim) will create another temp file or two to process the input and output for awk.

Don Cragun

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vitmp

VITMP(1)						      General Commands Manual							  VITMP(1)

NAME

       vitmp - edit temporary files

SYNOPSIS

       vitmp [VIM options] FILE...

DESCRIPTION

       vitmp is a wrapper around the VIM editor which may be used to invoke the editor in a way that is guaranteed to be suitable for editing tem-
       porary files used with programs such as crontab(1) and edquota(8).  The instance of the editor that is invoked is /bin/vi.

       In particular, it is guaranteed that the file, if edited, will be overwritten in place such that the modified contents may be read back via
       a previously obtained file descriptor.  Invoking the editor via vitmp also makes sure that no additional editor temporary files are used.

       Please note that vitmp offers no crash recovery capabilities.  If the editor crashes during the overwrite, data may be lost.

HISTORY

       vitmp first appeared in Openwall GNU/*/Linux 1.0.

AUTHORS

       Solar Designer <solar@owl.openwall.com>

SEE ALSO

       crontab(1), vi(1), vim(1), edquota(8)

Openwall Project						   25 April 2002							  VITMP(1)