script to replace files names and text

Posted on 2001-07-18
Last Modified: 2013-12-26
hi .

I have many files

each file begins with :

each file contain some text begins with tg_ or TG_

1. replace names tg_* > ft_*
2. replace text tg_* or TG_* > ft_* or FT_* accordingly .

Question by:Talmash
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Expert Comment

ID: 6293609
Something like this would probably work for you:


for file in tg_*.pm
  sed s/tg_/ft_/g $file | sed /TG_/FT_/g  "ft_"${file#tg_}

Hope this helps.
LVL 51

Accepted Solution

ahoffmann earned 100 total points
ID: 6294012
find . -name tg_\* -exec "perl -i -pe 's/tg_/ft_/g;s/TG_/FT_/g' {} ;echo {} XXXX {} \;"|sed -s 's#XXXX ./tg_#ft_/'|sh
LVL 84

Expert Comment

ID: 6294404
perl -i -pe 's/(tg_)/"ft_"^$1^lc($1)/ieg'
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Expert Comment

ID: 6294446
I'm sorry, my line should be:
sed s/tg_/ft_/g $file | sed /TG_/FT_/g > "ft_"${file#tg_}

(missed the redirect operator).

ahoffman and ozo: why would you start up the whole perl interpreter for sed commands?  The perl interpreter is by far the fattest, most expensive interpreter (outside of Java).  I'm not attacking you; I'm just curious.
LVL 51

Expert Comment

ID: 6294482
.. 'cause sed sucks in performance. Even a fat perl is faster in most cases ;-) and works identically on all supported platforms, and is much more comfortable in using regex, and .. and .. and ...
BTW, even (g)awk is faster than sed (at least on all Solaris and IRIX).

Talmash , sorry for off-topic comment.

Expert Comment

ID: 6294669
ahoffman, doesn't that really depend upon what you're doing.  If your going through thousands of records, I would agree; but if you're talking about a couple of hundred records, then the invocation of the perl shell takes longer than the whole sed thing.  And you're still using sed in your answer.  Anyway, it doesn't matter, you just have to use the right tool for the job.  Sorry for the comment, and thanks for the info.

Talmash, I'm sorry for the off-topic comment as well.
LVL 51

Expert Comment

ID: 6295540
mnashadka, I started using the right tools (like sed:) before Larry started programming perl, and I still prefer it for simple (short) things (see my example), but as soon as things get more complex, sed sucks.
I just gave you a general answer for your comment ;-)

anyway, hope we can focus on Talmash's problem now ..

Expert Comment

ID: 6358718
To change the text in a file you could use:

find . -type f -print | xargs file | grep -i text | cut -f1 -d: | while read

  file; do

vi $file >/dev/null 2>&1 <<!





Regards Mike

Author Comment

ID: 6555292
do I have something else to say but thank you very much .

Tal , moshav nechalim

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