Path: utzoo!attcan!uunet!cs.utexas.edu!romp!auschs!d75!panda!eli
From: eli@panda.uucp (Eli Taub/100000)
Newsgroups: comp.editors
Subject: Re: regexp..prepending a line globally (Vi)
Keywords: ed, ex, vi
Message-ID: <3242@d75.UUCP>
Date: 6 Jul 90 17:42:01 GMT
References: <1772@island.uu.net> <3236@d75.UUCP> <130@npdiss1.StPaul.NCR.COM>
Sender: news@d75.UUCP
Reply-To: eli@reed.UUCP (Eli Taub/100000)
Organization: IBM AWD, Austin, TX
Lines: 60

In article <130@npdiss1.StPaul.NCR.COM> mercer@npdiss1.StPaul.NCR.COM (Dan Mercer) writes:
#In article <3236@d75.UUCP> eli@panda.uucp (Eli Taub/100000) writes:
#:In article <1772@island.uu.net> daniel@island.uu.net (Daniel Smith - OPD Gang) writes:
#:>    All my years in vi and this one stumps me!  I wanted
#:>to make a real quick shell script, taken from the output
#:>of an ls-lR on uunet.  So, I get these lines:
#:>
#:>/usr/spool/ftp/comp.sources.unix/volume22/nn6.4:
#:>part01.Z
#:>part02.Z
#:            ... Stuff deleted ...
#:>What I want to end up with is:
#:>/usr/spool/ftp/comp.sources.unix/volume22/nn6.4/part01.Z
#:>/usr/spool/ftp/comp.sources.unix/volume22/nn6.4/part02.Z
#:>                Daniel
#:>   dansmith@well.sf.ca.us   daniel@island.uu.net   unicom!daniel@pacbell.com
#:
#:$s/$/^M:/
#:g/:/s@\(.*\):@,//- s!^!\1/!@\
#:d a\
#:*a
#:
#:To use, simply insert the above lines into a file, say exls,
#:and source it like `so' in (ex) command mode:      :so exls
#:    Eli Taub
#
#The real question was how to prepend lines. ...
#1,$s/^/\/usr\/acct\/xxxx.../
#
#Be sure to escape the slashes.
            ^^^^^^^^^^^^^^^^^^---> just use `!': %s!^!/usr/acct/xxxx!
#Dan Mercer
#Reply-To: mercer@npdiss1.StPaul.NCR.COM (Dan Mercer)

You are quite correct if you only had one directory to prepend to ALL
the lines, but what do you do with the output of say `ls -R /usr' ?
The above code will find the correct directory to prepend to EACH line.

For example on the file:    /usr:
                            bin
                            etc
                            /usr/etc:
                            rup
                            spray
                            /usr/include:
                            core.h
                            curses.h

If you source the code above you'll get:    /usr/bin
                                            /usr/etc
                                            /usr/etc/rup
                                            /usr/etc/spray
                                            /usr/include/core.h
                                            /usr/include/curses.h

And you can undo the whole thing with 1 `u'!!
                                                           _  |___      
Eli Taub                                                    |     |   \  |
(512) 838-4810                                                    |   /\/
Contractor at (AWD) IBM    I express my opinions not IBM's.      /   |  \