Help with tail command


 
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Top Forums Shell Programming and Scripting Help with tail command
# 8  
Old 02-05-2010
I could only find one simple way to generate the error message "tail: cannot open input".

Code:
echo "hello"|tail -1
hello

echo "hello"|tail - 1
tail: cannot open input
error: No such file or directory on file -


There were many other issues in the script.
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VIRTUAL(3)								 1								VIRTUAL(3)

virtual - Perform an Apache sub-request

SYNOPSIS
bool virtual (string $filename) DESCRIPTION
virtual(3) is an Apache-specific function which is similar to <!--#include virtual...--> in mod_include. It performs an Apache sub-request. It is useful for including CGI scripts or .shtml files, or anything else that you would parse through Apache. Note that for a CGI script, the script must generate valid CGI headers. At the minimum that means it must generate a Content-Type header. To run the sub-request, all buffers are terminated and flushed to the browser, pending headers are sent too. This function is supported when PHP is installed as an Apache module or by the NSAPI server module in Netscape/iPlanet/SunONE webservers. PARAMETERS
o $filename - The file that the virtual command will be performed on. RETURN VALUES
Performs the virtual command on success, or returns FALSE on failure. EXAMPLES
See apache_note(3) for an example. NOTES
Warning The query string can be passed to the included file but $_GET is copied from the parent script and only $_SERVER['QUERY_STRING'] is filled with the passed query string. The query string may only be passed when using Apache 2. The requested file will not be listed in the Apache access log. Note Environment variables set in the requested file are not visible to the calling script. Note This function may be used on PHP files. However, it is typically better to use include(3) or require(3) for PHP files. SEE ALSO
apache_note(3). PHP Documentation Group VIRTUAL(3)