POSTSCRIPT SUMMARY: Problem with sed - It misinterprets | (pipe).

From: LOEWENTHAL Simon (sloewenthal_at_gemini.edu)
Date: 05/31/05

  • Next message: Pablo Salazar: "DP and L9" 
    Date: Tue, 31 May 2005 12:20:44 -0400
To: Sun Mangers <sunmanagers@sunmanagers.org>

    Update: Here are the other suggestions:

    nawk -F: '{print $1":*LK*:"$3":"$4":"$5":"$6":"$7":"$8":"$9}'
    sed 's/^\([^:]*:\)[^:]*/\1*LK*/' shadow
    sed 's/\([^:]*\):[^:]*:\(.*\)/\1:*LK*:\2/' /etc/shadow
    TMP=`awk -F":" '{print $2}' /tmp/shadow.t` ; perl -pi -e s/${TMP}/*LK*/ /tmp/shadow.t
    cat shadow.t | sed s/^\([^:]*\):\([^:]*\):\(.*\)$/\1:\*LK\*:\3/g > newshadow.t
    sed 's/:[^:]*:/:\*LK\*:/' shadow.t > shadow.n

    Thanks to John Julie ; Jesse Trucks l Christian Iseli ; Eric Horne ;
    Andrew Hall ; Julie Baumler ; Chris Hoogendyk.

    I doublt that I'll ever get gsed -e 's/'`echo `cut -d: -f2
    shadow.t`|gsed -s 's/\//\\\//g'`'/\*LK\*/' working, which might be a
    good thing afterwall.

    LOEWENTHAL Simon wrote:

    >Hi everyone,
    >
    >Thank-you all for replying so quickly:
    >As Elvio simply put it:
    >
    >awk -F":" '{printf("%s:*LK*:%s::::::\n",$1,$3)}' /etc/shadow
    >While Luc said,
    >
    > egrep -v luc /etc/shadow > /tmp/shadow
    > echo 'luc:*LK*:::::::' >> /tmp/shadow
    > cp /tmp/shadow /etc/shadow
    > rm /tmp/shadow
    > chmod 400 /etc/shadow
    >
    >For info, I tried using an @ instead of a /, but got the same result,
    > gsed -e 's@'`echo `cut -d: -f2 shadow.t`|gsed -s 's@\/@\\\/@g'`'@\*LK\*@' <shadow.t shadow.n
    >./test: syntax error at line 1: `|' unexpected
    >
    >Awk wins this time.
    >I'd still like to know the sed solution, though.
    >
    >Many thanks to you all,
    >S.
    >
    >
    >LOEWENTHAL Simon wrote:
    >
    >
    >
    >>Dear all Sed madmen,
    >>
    >>I'm trying to write something that sets the encrypted field in the
    >>shadow file to *LK*, but sed will choke whenever the field has a / in
    >>it, so I wrote something to nest sed inside sed with cut so that it
    >>replaces instances of / with /\
    >>
    >>However, sed chokes when interpreting the |. I have tried putting '
    >>and ` in all the places I can think of, but it usually makes it worse.
    >>
    >>Cut the encrypted password out and then get gsed to replace the / with
    >>\, which work fine.
    >>
    >>Cat shadow.t
    >>
    >> GogunE:ndY3rmE/bkxt.:12180::::::
    >>
    >> echo `cut -d: -f2 shadow.t`|gsed -s 's/\//\\\//g'
    >>
    >>What it correctly produces,
    >>
    >> ndY3rmE\/bkxt.
    >>
    >>Finally I use gsed to replace the earlier output with *LK*.
    >>
    >> gsed -e 's/'`echo `cut -d: -f2 shadow.t`|gsed -s
    >>'s/\//\\\//g'`'/\*LK\*/' <shadow.t
    >>
    >>Then it chokes,
    >>
    >> ./test: syntax error at line 1: `|' unexpected
    >>
    >>Regards, S.
    >>
    >>PS. I'm sorry that this is not Sun specific, but I think that there
    >>are plenty of sed users in the audience, but I've been at this for the
    >>past 5 hours and am starting to doubt my sanity.
    >>
    >>
    >>
    >
    >
    > 

    -- 
ISG/Gemini/AURA
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