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  Help Page - stream

( Some help pages may not display correctly in html because those help pages may have sample code
in them, part of which may be mis-interpreted as html tags.

All help pages, including this help page, are available in biterScripting with the help command. )




System Feature stream Purpose Directs the flow of data among commands, files, screen, variables, etc. Syntax No explicit syntax. Description A stream is flow of data. Every command has three streams associated with it. Input Stream Command takes its input from this stream. Some commands, such as scd (Show Current Directory), ignore data in input stream. Output Stream Command writes its output to this stream. Commands that don't have any output, ignore this stream. Error Stream Command writes any errors it encounters to this stream. All streams can be redirected to valid stream destinations, which are listed below. Both text and binary (hexadecimal representation) data can be redirected using streams. Valid Stream Destinations Valid stream destinations are as follows. (They are also called redirection targets.) screen This is the default destination unless the stream is redirected. file Stream data is redirected to/from a file. Files can be local, on a local network, or on internet. variable Stream data is redirected to/from a variable. The type of variable must be of type string. NULL For input, data is ignored. For output and error, data is suppressed (and not written anywhere). pipe (|) Output from one command is input to the next command. inline command An inline command whose output is a valid stream destination. For details on how to specify pipe as a stream destination, see help page on pipe. For details on how to specify other stream destinations, see the help pages on input, output, and error. If a stream is redirected to/from a file, IT IS RECOMMENDED THAT ABSOLUTE PATH NAME FOR THE FILE BE SPECIFIED. Consider the following example. cd "C:/" # List all directories var str dirList lf -n "*" "." ($ftype=="d") > $dirList # Go into each directory, and list files there. var str dir while ($dirList <> "") do lex "1" $dirList > $dir cd $dir lf -n "*" "." ($ftype=="f") >> fileList.txt ### <==== Watch this redirection. done The lf command will list files in each directory, and will write its output to fileList.txt in that directory. This will create a fileList.txt file in each directory. If that's what you want, then this would work. But, if you want to write the output of all lf commands to just one output file, use the following redirection in terms of absolute path name. lf -n "*" "." ($ftype=="f") >> "C:/fileList.txt" Similarly, we recommend enclosing absolute path names in double quotes. Restrictions All the access permissions apply to streams. For example, if you do not have permission to write to a local file, specifying that file as the output stream destination will produce an error. Similarly, if a file is at a web site (has the prefix of http://), and if you do not have permission to access that file, an error will be produced. Stream redirection is preferred over inline commands for variable assignment. For example, for a string variable s, instead of set $s={ lex "1" $text } the following is preferred. lex "1" $text > $s Valid Examples The following are examples of valid stream destinations. "C:/My Directory/My File" "http://www.mywebsite.com/index.html" Invalid Examples The following are examples of invalid stream destinations. C:/My Directory/My File Will produce an error since the file name has spaces and its path is not enclosed within double quotes. "C:/My Directory/" Will produce an error since "My Directory" is a directory (assuming) and not a file. See Also pipe input output error lf

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