Bash

cmfarley19 · 07-25-2004, 09:32 AM

I know this has to be such a simple solution, but I can not figure it out...
I have a string

Code:

GALNAME="Our Family Photos"

I want to create a new string with teh same name except replacing spaces with underscores. I do that with

Code:

GALNAME_NO_SP=`echo "$GALNAME" | tr " " "_"`

That wroks fine. Here's where I'm stuck. I want to create a third string That concatenates the new string with some other info and strings.

Code:

PAGENUMER=1
echo "$GALNAME_NO_SP_page$PAGENUMBER"

I want the to echo "Our_Family_Photos_page1". All it echos is "1". The shell is interpreting "$GALNAME_NO_SP_page" as a variable.
How can I get the shell to interpret $GALNAME_NO_SP as the variable and cat "_page" at the end? If I do

Code:

echo "$GALNAME_NO_SP _page$PAGENUMBER"

then I get "Our_Family_Photos _page1" with a space

Any thoughts?

acid_kewpie · 07-25-2004, 09:37 AM

i'd just say do things in a different order:

Code:

echo $GALNAME page$PAGENUMBER | tr ' ' '_'

acid_kewpie · 07-25-2004, 09:43 AM

oh you could also quote the vairable.... "$GALNAME"_page... but that should be just for reference now i hope!

cmfarley19 · 07-25-2004, 10:06 AM

Both are excellent appraches.
It was early here on the US east coast.
Brain was still warming up.

Thanks.

jlliagre · 07-25-2004, 10:09 AM

or use this syntax:
${GALNAME_NO_SP}_page$PAGENUMBER"

cmfarley19 · 07-25-2004, 10:10 AM

Acid_kewpie,
That did it.

Cheers.

cmfarley19 · 07-25-2004, 10:12 AM

jlliagre,
That will do it too.

Thanks.

Hko · 07-25-2004, 10:15 AM

Or:

Code:

echo "${GALNAME_NO_SP}_page$PAGENUMBER"

As "man bash" puts it:

Quote:

${parameter}
The value of parameter is substituted. The braces are required
when parameter is a positional parameter with more than one
digit, or when parameter is followed by a character which is not
to be interpreted as part of its name.

<edit>
Hmm, seems jlliagre types faster than me :-)
</edit>

jlliagre · 07-25-2004, 12:01 PM

Well, my answer was less detailed ...
I think it's a draw