topic Re: Replace in a string in Operating System - Linux

Replace in a string

Leo The Cat — Tue, 02 Jun 2009 17:15:21 GMT

Hi

I've this in input

/logs/test/1/xxxx

I'd like to replace
/logs/
by
/logs_backup/

The result must be /logs_backup/test/1/xxxx

How to do this small trick?

Regards
Den

Re: Replace in a string

Leo The Cat — Tue, 02 Jun 2009 17:52:58 GMT

to be precise

A=/logs/test/1/xxxx
A=Transformed_string($A)

Now A = /logs_backup/test/1/xxxx
mkdir -p $A

Something like that ....

Re: Replace in a string

Ivan Ferreira — Tue, 02 Jun 2009 17:58:30 GMT

A=/logs/test
A=$(echo $A | sed 's/logs/logs_backup/')

echo $A

Re: Replace in a string

Leo The Cat — Tue, 02 Jun 2009 18:18:37 GMT

HUmmm

Is this will replace only the first occurence ?

Bests regards Ivan
Den

Re: Replace in a string

James R. Ferguson — Tue, 02 Jun 2009 18:39:02 GMT

Hi Den:

> Is this will replace only the first occurence ?

Well, yes on a line-by-line basis. That is every _line_ in your input file will have the substitution performed _once_.

If you add the 'g' flag to the substitution, then every occurance on every line will be replaced:

# sed 's/logs/logs_backup/g' file

Regards!

...JRF...

Re: Replace in a string

Leo The Cat — Wed, 03 Jun 2009 11:55:18 GMT

Hum

ok. But if the replace string is
/su01/bazar/
instead of /logs_backup/

/logs/test/1/xxxx
=> /su01/bazar/test/1/xxxx

Bests regards
Den

Re: Replace in a string

ghostdog74 — Wed, 03 Jun 2009 13:33:01 GMT

well, do the same thing, but this time, using the new string...what's wrong with that? have you tried it using sed?

Re: Replace in a string

James R. Ferguson — Wed, 03 Jun 2009 13:35:36 GMT

Hi Den:

> ok. But if the replace string is
/su01/bazar/
instead of /logs_backup/

Escape the forward slashes like:

# X=/logs/test/1/xxxx
# echo ${X}|sed -e 's/\/logs/\/su01\/bazar/g'
/su01/bazar/test/1/xxxx

Regards!

...JRF...

Re: Replace in a string

Leo The Cat — Wed, 03 Jun 2009 14:46:52 GMT

Thanks to you Guys
Bests Regards
Den