Bash — Define function by dynamic using variable

.BASH.md

Bash — Define function by dynamic using variable

Example

Define function name variable

function_name="some_func"

Eval

eval "function $function_name() { echo ok this is dynamic function; }"

Or another style

eval function "$function_name"\(\) \{ echo ok this is dynamic function\; \}

Above examples both evaluated as below.

function some_func(){ echo ok this is dynamic function; }

Only $function_name is expanded as shell variable before eval evaluating.

Execute

$ some_func
ok this is dynamic function

Versions

• bash-4.4
• sh-3.2
• GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin17)

Links

• Medium—imported

create_dynamic_function.sh

#!/usr/bin/env bash -eu

function_name="some_func"

eval "function $function_name() { echo ok this is dynamic function; }"

some_func

# ok this is dynamic function

type some_func

# some_func is a function
# some_func ()
# {
#     echo ok this is dynamic function
# }