declare builtin

• https://tldp.org/LDP/abs/html/declareref.html
• https://www.gnu.org/software/bash/manual/html_node/Bash-Builtins.html

declare -p

declare -x                             -x export
 declare -x PWD="/srv/your-path"

declare -r

declare: -A: invalid option

export DATE=$(date -I); echo $DATE

See also

• export, env, printenv, declare, export -f, /etc/environment
• builtin
• Variable, Environment variables, declare, Type checking
• Bash [ -c ], alias, &&, Bash history, Autocompletion, set, unset, export, .bash_aliases, .bashrc and .bash profile, PS1, echo, brace expansion, Function, shopt, trap, set -e, source, PATH, complete, disown, .hushlogin, .bashrc, builtin, eval, set, $PATH, $HOME, TZ, .profile, -e, -i, Builtin (Bash), mapfile, ~, return (Bash), for, until, declare, dirname, basename, functions.sh, Bash arithmetic expansion, shift, bash --rcfile, readonly, $1, $@