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| Chapter 16 Where Did I Put That? |

## 16.19 stree: Simple Directory Tree

Here's a simple script that prints a directory tree. It works on any terminal, can be printed or sent in a mail message, and so on. If you don't give stree a directory name, it starts at the current directory. If you give it a -a (all) option, the stree script lists all files, directories, symbolic links, etc. Otherwise, it just lists directories. For example:

>     % stree lib
>     Tree for directory lib:

>     lib
>      "      at_cron
>      "       "      RCS
>      "       "      test
>      "      csh
>      "      ksh
>      "      RCS.Z
>      "      tmac
>      "       "      mm
>      "       "       "      RCS
>      "       "      ms
>      "       "       "      RCS

The top-level directory is listed along the left-hand edge. The first level of subdirectories is indented by one tabstop. A ditto mark (`"`) below a name means "same parent directory as above." So, for example, the last directory in that listing is lib/tmac/ms/RCS.

Here's the script:

    ${1-.}

    "newline

    @
    #! /bin/sh

    case "$1" in
    -a) shift
        dir=${1-.}  # DEFAULT TO CURRENT DIRECTORY
        echo Tree for directory $dir and its files:
        ;;
    *)  findtype="-type d"  # IF NO -a FLAG, MAKE find USE "-type d"
        dir=${1-.}
        echo Tree for directory $dir:
        ;;
    esac

    echo "
    $dir"
    find $dir $findtype -print |
    tr / \\001 | sort -f | tr \\001 / |
    sed -e s@\^$dir@@ -e /\^$/d -e 's@[^/]*/@ "[TAB]@g'

The script uses tr (35.11) to change slash (`/`) characters into CTRL-a (octal 001 (51.3)) during the sort. That makes the slashes sort before letters and other characters so the directory names will always come out before their contents.

- JP

16.18 Listing Files You've Created/Edited Today |  | 16.20 The vtree Visual Directory Tree Programs