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declare

Inspect and manipulate Bash variables and functions, often combined with compgen for shell introspection

List all declared shell functions

declare -F | gawk '{ a[$3] } END { n=asorti(a,b); for (i=1;i<=n;i++) print b[i] }'

Show full definition of all functions

declare -f

Display definition of a specific function

declare -f my_function

List functions matching a pattern

compgen -A function | grep '^git'

Print function definitions for matched functions

declare -f $(compgen -A function | grep '^git')

Check if a function is defined

compgen -A function | grep -qx my_function && echo "defined"

Export a function to child shells

declare -fx my_function

List only exported functions

declare -F | awk '$3=="-x"{print $1}'

Remove (unset) a function

unset -f my_function

Dump all function names with line numbers

declare -F