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Appendix P. To Do List

  • A comprehensive survey of incompatibilities between Bash and the classic Bourne shell.

  • Same as above, but for the Korn shell (ksh).

  • A primer on CGI programming, using Bash.

    Here is a simple CGI script to get you started.

    Example P-1. Print the server environment

    #!/bin/bash
    # May have to change the location for your site.
    # (At the ISP's servers, Bash may not be in the usual place.)
    # Other places: /usr/bin or /usr/local/bin
    # Might even try it without any path in sha-bang.
    
    # test-cgi.sh
    # by Michael Zick
    # Used with permission
    
    
    # Disable filename globbing.
    set -f
    
    # Header tells browser what to expect.
    echo Content-type: text/plain
    echo
    
    echo CGI/1.0 test script report:
    echo
    
    echo environment settings:
    set
    echo
    
    echo whereis bash?
    whereis bash
    echo
    
    
    echo who are we?
    echo ${BASH_VERSINFO[*]}
    echo
    
    echo argc is $#. argv is "$*".
    echo
    
    # CGI/1.0 expected environment variables.
    
    echo SERVER_SOFTWARE = $SERVER_SOFTWARE
    echo SERVER_NAME = $SERVER_NAME
    echo GATEWAY_INTERFACE = $GATEWAY_INTERFACE
    echo SERVER_PROTOCOL = $SERVER_PROTOCOL
    echo SERVER_PORT = $SERVER_PORT
    echo REQUEST_METHOD = $REQUEST_METHOD
    echo HTTP_ACCEPT = "$HTTP_ACCEPT"
    echo PATH_INFO = "$PATH_INFO"
    echo PATH_TRANSLATED = "$PATH_TRANSLATED"
    echo SCRIPT_NAME = "$SCRIPT_NAME"
    echo QUERY_STRING = "$QUERY_STRING"
    echo REMOTE_HOST = $REMOTE_HOST
    echo REMOTE_ADDR = $REMOTE_ADDR
    echo REMOTE_USER = $REMOTE_USER
    echo AUTH_TYPE = $AUTH_TYPE
    echo CONTENT_TYPE = $CONTENT_TYPE
    echo CONTENT_LENGTH = $CONTENT_LENGTH
    
    exit 0
    
    # Here document to give short instructions.
    :<<-'_test_CGI_'
    
    1) Drop this in your http://domain.name/cgi-bin directory.
    2) Then, open http://domain.name/cgi-bin/test-cgi.sh.
    
    _test_CGI_

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