[SOLVED]bash problem

szypul · 2008-10-24 17:29:23

Hi,
I'm passing name of env. variable as an scrip argument (. ./script.sh NAME). I would like to check it's value inside my script. How to do it? ${1} gives me name, how can I get value behind this name?

Last edited by szypul (2008-10-31 11:26:42)

phrakture · 2008-10-24 18:51:58

If you defined NAME in the parent environment, it will be passed to script.sh as would any other variable.

For instance, if script.sh was this:

#!/bin/sh
#script.sh
echo "Inside script.sh, NAME=$NAME"

The following would work:

$ NAME="Barack Obama"
$ ./script.sh
Inside script.sh, NAME=Barack Obama

Your example would not work, as it does nothing with the environment variable, but passes the name of the variable as an argument.

rson451 · 2008-10-24 19:13:24

[randy@voodoo ~]$ cat test.sh
#!/bin/bash
eval echo "\$$1"
[randy@voodoo ~]$

produces

[randy@voodoo ~]$ sh test.sh SHELL
/bin/zsh
[randy@voodoo ~]$ sh test.sh TERM
xterm
[randy@voodoo ~]$ sh test.sh USER
randy
[randy@voodoo ~]$

Last edited by rson451 (2008-10-24 19:14:25)

szypul · 2008-10-24 19:18:38

phrakture, I think you missunderstood me. In shell I can do "echo $NAME" to get its value. I would like to get that value inside my script.
Edit:
Thaks rson451: ) Too simple to think about it: )

Last edited by szypul (2008-10-24 19:27:32)

rson451 · 2008-10-24 19:24:42

ok..

[randy@voodoo ~]$ cat test.sh
#!/bin/bash
TEST=$(eval echo "\$$1")
echo "TEST=$TEST"

produces

[randy@voodoo ~]$ sh test.sh SHELL
TEST=/bin/zsh
[randy@voodoo ~]$ sh test.sh USER
TEST=randy
[randy@voodoo ~]$

Last edited by rson451 (2008-10-24 19:25:16)

phrakture · 2008-10-24 20:17:18

szypul wrote:

phrakture, I think you missunderstood me. In shell I can do "echo $NAME" to get its value. I would like to get that value inside my script.

Yeah, sorry I misread 8)

rson451 · 2008-10-24 20:31:12

No problem

Dieter@be · 2008-10-25 10:10:54

You can do this easier and cleaner

$ var_name=i_am_a_var
$ i_am_a_var=i_am_the_value
$ echo ${!var_name}
i_am_the_value

Arch Linux

#1 2008-10-24 17:29:23

[SOLVED]bash problem

#2 2008-10-24 18:51:58

Re: [SOLVED]bash problem

#3 2008-10-24 19:13:24

Re: [SOLVED]bash problem

#4 2008-10-24 19:18:38

Re: [SOLVED]bash problem

#5 2008-10-24 19:24:42

Re: [SOLVED]bash problem

#6 2008-10-24 20:17:18

Re: [SOLVED]bash problem

#7 2008-10-24 20:31:12

Re: [SOLVED]bash problem

#8 2008-10-25 10:10:54

Re: [SOLVED]bash problem

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