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Full Discussion: Help with regular command creation for editor vi
Top Forums Shell Programming and Scripting Help with regular command creation for editor vi Post 302998750 by Don Cragun on Tuesday 6th of June 2017 05:14:22 PM
Old 06-06-2017
To rearrange the first five fields of all lines in a file named file that contain five or more <hyphen> separated fields and leave other lines unchanged, you could use:
Code:
sed 's/\([^-]*\)-\([^-]*\)-\([^-]*\)-\([^-]*\)-\([^-]*\)/\3-\2-\1-\5-\4/' file

Note that BRE back references count fields starting at 1, not 0.

If you are in vi with file currently loaded into the editing buffer and want to make that change to all lines in the buffer that match that pattern, the command to type into vi would be:
Code:
:g/\([^-]*\)-\([^-]*\)-\([^-]*\)-\([^-]*\)-\([^-]*\)/s//\3-\2-\1-\5-\4/

If this isn't what you want, you need to write a much clearer statement of your requirements, tell us what operating system you're using, what shell you're using, where these strings are located, where you want the results to be placed, etc.

Note, however, that the above code will NOT change "duck" to "duk" while it rearranges the fields. If you really want to do that, you'll need to further explain the logic used to determine which letters to drop from which fields while rearranging fields.
 

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LEARN ABOUT SUSE

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)
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