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### FS utils

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function _list {

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    local glob="$1"

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    local test="$2"

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    local prefix="$3"

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    for file in $glob; do

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        [ $test "$file" ] || continue

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        [ -n "$prefix" ] && file="${file#$prefix}"

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        echo -n "$file "

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    done

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}

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## List names of all things in dir

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function list {

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    _list "$1/*" '-e' ${2:-$1/}

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}

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## List names of files in dir:

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#

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#   list_files $dir

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#

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function list_files {

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    _list "$1/*" '-f' ${2:-$1/}

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}

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## List names of dirs in dir:

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function list_dirs {

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    _list "$1/*" '-d' ${2:-$1/}

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}

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## Expand a file or directory path to any files/directorys within that tree

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function list_tree {

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    _list "$1 $1/**" '-e' ''

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}