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Full Discussion: how to expand environment variables in a file?
Top Forums UNIX for Dummies Questions & Answers how to expand environment variables in a file? Post 302330577 by debbie15 on Wednesday 1st of July 2009 05:00:47 PM
Old 07-01-2009
Hi Jim,
I want to substitute the value for ${SourceFilePath} and not create a file with the variable name. file.txt is already existing.

My scenario is like this.

file.txt is present on the TEST & DEV
I want to use the environment variable to point either to TEST or DEV.
So i will have one parameter file
PATH=$SourceFilePath/file.txt

I want to write a script which will generate a new file for the following system
TEST server should create a new file abc.txt with the following content

PATH=/db1/Src/test/file.txt

DEV server should create a new file xyx.txt with the following content

PATH=/db1/Src/dev/file.txt

The command or script must only substitute the value for the environment variable.

Thanks for your input.
 

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LEARN ABOUT DEBIAN

envsubst

ENVSUBST(1)								GNU							       ENVSUBST(1)

NAME

       envsubst - substitutes environment variables in shell format strings

SYNOPSIS

       envsubst [OPTION] [SHELL-FORMAT]

DESCRIPTION

       Substitutes the values of environment variables.

   Operation mode:
       -v, --variables
	      output the variables occurring in SHELL-FORMAT

   Informative output:
       -h, --help
	      display this help and exit

       -V, --version
	      output version information and exit

       In  normal  operation  mode, standard input is copied to standard output, with references to environment variables of the form $VARIABLE or
       ${VARIABLE} being replaced with the corresponding values.  If a SHELL-FORMAT is given, only those environment variables that are referenced
       in SHELL-FORMAT are substituted; otherwise all environment variables references occurring in standard input are substituted.

       When --variables is used, standard input is ignored, and the output consists of the environment variables that are referenced in SHELL-FOR-
       MAT, one per line.

AUTHOR

       Written by Bruno Haible.

REPORTING BUGS

       Report bugs to <bug-gnu-gettext@gnu.org>.

COPYRIGHT

       Copyright (C) 2003-2007 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The full documentation for envsubst is maintained as a Texinfo manual.  If the info and envsubst programs are properly  installed  at  your
       site, the command

	      info envsubst

       should give you access to the complete manual.

GNU gettext-runtime 0.18.1					     June 2010							       ENVSUBST(1)
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