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Full Discussion: Extract variable name in a string
Top Forums UNIX for Dummies Questions & Answers Extract variable name in a string Post 302879365 by maturix on Thursday 12th of December 2013 06:01:39 AM
Old 12-12-2013
Extract variable name in a string
Hi,
I'm doing a script to list all scripts called by a "master" script.
But I have an issue as there is some variables in the name of the called scripts.

Example:
Code:
% cat master_script.sh
ENVIR=PROD
VERSION=1.2
/users/maturix/$ENVIR/program_$VERSION.sh

I would like my script displays a kind of grep "\.sh" master_script.sh but by replacing the variables by their content, to have such output:
Code:
/users/maturix/PROD/program_1.2.sh

Note that the variables are not only these ones ENVIR & VERSION.

I did something like that to modify the variable between two /:
Code:
var=$(grep "\.sh" master_script.sh | sed 's/\//\n/g' | grep '^\$')
var_content=$(grep "^$(echo $var | cut -c 2-100)=" master_script.sh | cut -d'=' -f2)
grep "\.sh" master_script.sh | sed "s/$var/$var_content/g"

Which give as result:
/users/maturix/PROD/program_$VERSION.sh

Now I need to change $VERSION with its content, and more generally I will have other cases, not only variable between // or before a "."
Is there a generic way to extract the variable names from a string ?
Last edited by maturix; 12-12-2013 at 09:37 AM..
 

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LEARN ABOUT MINIX

zgrep

ZGREP(1)                                                      General Commands Manual                                                     ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep  options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

                                                                                                                                          ZGREP(1)
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