A snippet for more functional style bash scripts

map.sh

#!/bin/bash

# map the data output from CLI tools like ls or find
# to execute action on each result.
#
# Example Usages:
#    map <FUNCNAME or CLI COMMAND> "$(find ./some-folder -mindepth 1)"
# or
#    find ./some-folder -mindepth 1 | map <FUNCNAME or CLI COMMAND>
#
map() {
        local ACTION=$1
        local IFS=$(echo -en "\n\b")

        # test argument 2 with parameter exapnsion
        if [ -z ${2+x} ]; then
                # argument 2 not set
                # read from STDIN
                while read -r INPUT; do
                        $ACTION $INPUT
                done
        else
                # argument 2 is set
                # read from DATA
                for f in $2; do
                        $ACTION $f
                done
        fi
}

The below one liner would have similar effects:

find ./some-folder -mindepth 1 | xargs -i -d "\n\b" <FUNCNAME or CLI COMMAND> "{}"

Options explained for xargs:

• -i specifies to use replacement string (default "{}").
• -d specifies the delimiter between input items. The argument -d "\n\b" would work properly with find and ls output that has file / folder names that with space.