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Full Discussion: env file
Top Forums UNIX for Dummies Questions & Answers env file Post 9052 by Perderabo on Monday 22nd of October 2001 10:03:36 AM
Old 10-22-2001
I put my .env file in my home directory, but there's a little more to it.

My .env file defines a bunch of functions and aliases that I want available in all of my interactive shells. On the other hand, I would prefer that my ksh scripts ignore the .env file since they do not need the aliases and it would slow them down. This is a common situation and I use the standard ksh trick to address it:
Code:
FILE=$HOME/.env
ENV='${FILE[(_$-=1)+(_=0)-(_$-!=_${-%%*i*}}]}'
export ENV FILE

This treats FILE as an array where only ${FILE[0]} has a value. That complex subscript computes to 0 for interactive shells and to 1 for non-interactive shells. This trick originates with Dr. Korn himself. It's in his book.
 

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LEARN ABOUT V7

env

ENV(1)                                                             User Commands                                                            ENV(1)

NAME

       env - run a program in a modified environment

SYNOPSIS

       env [OPTION]... [-] [NAME=VALUE]... [COMMAND [ARG]...]

DESCRIPTION

       Set each NAME to VALUE in the environment and run COMMAND.

       Mandatory arguments to long options are mandatory for short options too.

       -i, --ignore-environment
              start with an empty environment

       -0, --null
              end each output line with NUL, not newline

       -u, --unset=NAME
              remove variable from the environment

       -C, --chdir=DIR
              change working directory to DIR

       --help display this help and exit

       --version
              output version information and exit

       A mere - implies -i.  If no COMMAND, print the resulting environment.

AUTHOR

       Written by Richard Mlynarik and David MacKenzie.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report env translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 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

       Full documentation at: <http://www.gnu.org/software/coreutils/env>
       or available locally via: info '(coreutils) env invocation'

GNU coreutils 8.28                                                 January 2018                                                             ENV(1)
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