set command displays all the local variables like below. How do I export these variables all at once?
>set
a=123
b="asd asd"
c="hello world"
5 Answers
Run the following command, before setting the variables:
set -a
set -o allexport # self-documenting version
-a
When this option is on, the export attribute shall be set for each variable to which an assignment is performed
-o option-name
Set the option corresponding tooption-name:
allexport
Same as-a.
To turn this option off, run set +a or set +o allexport afterwards.
Example:
set -a # or: set -o allexport
. ./environment
set +a
Where environment contains:
FOO=BAR
BAS='quote when using spaces, (, >, $, ; etc'
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17This must be enabled before assigning to variables, though. It doesn't do anything to previously assigned variables.– chepnerJun 13, 2013 at 15:13
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1
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3This also automatically exports functions in the same way as
function example(){ echo good; }; export -f example– Oliver IAug 29, 2017 at 15:16
Same preliminary requirement as chosen answer ... either explicitly export each variable as per
export aaaa=1234
or prior to any variable assignment issue
set -a # for details see answer by @nitin
then this works if your shell is bash ( possibly other shells as well )
export > /my/env/var/file
your new file will contain a dump of all currently defined variables ... with entries like
declare -x PORT="9000"
declare -x PORT_ADMIN="3001"
declare -x PORT_DOCKER_REGISTRY="5000"
declare -x PORT_ENDUSER="3000"
declare -x PRE_BUILD_DIR="/cryptdata6/var/log/tmp/khufu01/loud_deploy/curr/loud-build/hygge"
declare -x PROJECT_ID="hygge"
declare -x PROJECT_ID_BUSHIDO="bushido"
then to jack up current shell with all those env vars issue
source /my/env/var/file
answered Apr 3, 2018 at 16:16
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1I believe
exportonly prints variables that are already (marked to be) exported, while I believe the question is about variables that are set, but not marked to be exported. I just tested this on bash, which prints nothing:FOOBAR=x; export | grep FOOBAR. Mar 9, 2022 at 15:58 -
`echo "export" $((set -o posix ; set)|awk -F "=" 'BEGIN{ORS=" "}1 $1~/[a-zA-Z_][a-zA-Z0-9_]*/ {print $1}')`
First, get all set environment variables:
(set -o posix ; set)Reference: https://superuser.com/questions/420295/how-do-i-see-a-list-of-all-currently-defined-environment-variables-in-a-linux-baGet all environment variable names, separated by space:
awk -F "=" 'BEGIN{ORS=" "}1 $1~/[a-zA-Z_][a-zA-Z0-9_]*/ {print $1}'Reference: awk-Printing column value without new line and adding comma and https://stackoverflow.com/questions/14212993/regular-expression-to-match-a-pattern-inside-awk-commandNow, we need to export these variables, but xargs can not do this because it forks child process, export have to be run under current process.
echo "export" ...build a command we want, then use `` to run it. That's all :p.
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Welcomme to U&L SE. Maybe you can edit your post and give some explication.– ArchemarMar 6, 2015 at 12:09
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1It's not correct to assume environment variable names will consist solely of a-z and A-Z. They commonly include underscores and digits as well, so the pattern would be
[a-zA-Z_][a-zA-Z0-9_]*. There are some variations on this based on the shell you're using, but this is the safe / portable approach. May 5, 2017 at 17:27 -
You can prepend export to the variable name via awk and eval the resulting output:
eval $(printenv | awk -F= '{ print "export " $1 }')
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3
printenvprints the variables that are already exported. That also won't work properly if there are variables that contain newline characters. Aug 29, 2017 at 10:57
compgen -v will print a list of all variable names so you can export them all with
export $(compgen -v)
This will have various effects depending on the variables you have defined (ex: BASHOPTS will get exported by this). Be wary of how you use this.
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Or just
export $(compgen -v)(also assuming an unmodified$IFS), bearing in mind that exporting bash builtin variables such asSHELLOPTSorBASHOPTScan have nasty consequences. Feb 6, 2022 at 15:01 -
Thanks, I never realized
exportaccepts multiple symbols. I've incorporated most of your comment into the answer.– johncsFeb 12, 2022 at 0:54
setalso displays functions and system variables like BASH_VERSIONsetoutput you're showing? If so, then it's notbash's. Do you want to export all the currently set variable including the special shell variables? Or only those 3 variables like inexport a b c?export ${!T*}would export any defined parameter whose name starts withT. Unfortunately, there doesn't seem to be a way to easily generate a list of all defined parameters.