topic Re: Variable probleme in Operating System - Linux

Variable probleme

Leo The Cat — Wed, 03 Jun 2009 17:39:48 GMT

Hi

Here my call

find /su01/opus/html/*.html -type f -exec perl -i -pe 's|\Q’$ENVSOURCE’\E|’$ENVDEST’|g' {} \;

The problem is that $ENVSOURCE and $ENVDEST are never evaluated. Why ?

Bests Regards
Den

Re: Variable probleme

Leo The Cat — Wed, 03 Jun 2009 17:44:59 GMT

I have tried ${ENVSOURCE} without success
I have tried $($ENVSOURCE) without success

Re: Variable probleme

Leo The Cat — Wed, 03 Jun 2009 17:59:57 GMT

Important note

find /su01/opus/html/*.html -type f -exec perl -i -pe 's|\Qâ $ENVSOURCEâ \E|â $ENVDESTâ |g' {} \;

Works perfectly in a command line mode.

The problem is when I have trued to put this command in a ksh script !

Bests regards
Den

Re: Variable probleme

Steven Schweda — Wed, 03 Jun 2009 18:02:26 GMT

Some of those characters don't copy+paste on
my system, so I can't tell what they really
are, but inside apostrophes, variables are
not evaluated. For example:

alp$ E='a b c'
alp$ echo ${E}
a b c
alp$ echo "${E}"
a b c
alp$ echo '${E}'
${E}

"man sh"? Buy a book?

Re: Variable probleme

Leo The Cat — Wed, 03 Jun 2009 18:06:37 GMT

Sorry but I have no time to become a caid on sh ! It's because I come here !

Re: Variable probleme

Ivan Ferreira — Wed, 03 Jun 2009 18:06:45 GMT

As methioned above, replace single quotes by double quotes if you can. Single quotes prevents the variables from being subtituted.

Probably, you should write a perl script and call the script from the find command. I don't know much about perl.

Re: Variable probleme

James R. Ferguson — Wed, 03 Jun 2009 20:38:15 GMT

Hi Den:

The $ENVSOURCE and $ENVDEST are Perl's variables, not the shell's. All you need do is this:

# export ENVSOURCE=oldthing
# export ENVDEST=newthing

# perl -i.old -pe 'BEGIN{$ENVSOURCE=$ENV{ENVSOURCE};$ENVDEST=$ENV{ENVDEST};};s|\Q.$ENVSOURCE.\E|.$ENVDEST.|g' file

Thus we export to the environment in which Perl will run and then tell Perl to use the exported environmental variables.

Obviously you can couple this with your shell find() as you wrote. You could also use Perl's 'File::Find' module directory.

Regards!

...JRF...

Re: Variable probleme

Leo The Cat — Tue, 15 Sep 2009 11:18:25 GMT

James and Ivan give me the good way.
Thanks Guys