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Procyon

Member

Registered: 2008-05-07

Posts: 1,819

Bash: Variable with variable name

I have a variable with a variable name in it. I think I once saw an easy way to get the value of the second variable, but all that seems to work for me is with eval:

$ var=foo
$ foo=bar
$ eval echo \$$var
bar

How can this be done without eval?

iphitus

Forum Fellow

From: Melbourne, Australia

Registered: 2004-10-09

Posts: 4,927

Re: Bash: Variable with variable name

that's what's used in /etc/rc.d/network

Dieter@be

Forum Fellow

From: Belgium

Registered: 2006-11-05

Posts: 2,001

Website

Re: Bash: Variable with variable name

echo ${!var}

This is called indirection. See http://wooledge.org:8000/BashFAQ/006

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< Daenyth> and he works prolifically
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Procyon

Member

Registered: 2008-05-07

Posts: 1,819

Re: Bash: Variable with variable name

Thanks, works great.

Allan

Pacman

From: Brisbane, AU

Registered: 2007-06-09

Posts: 11,384

Website

Re: Bash: Variable with variable name

echo ${!var}

This is called indirection. See http://wooledge.org:8000/BashFAQ/006

Cool.  Bash knowledge++.

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iphitus

Forum Fellow

From: Melbourne, Australia

Registered: 2004-10-09

Posts: 4,927

Re: Bash: Variable with variable name

awesome