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Lesson 1















Automated Internet

Automated Editors

Sample Scripts

Precompiled Functions

System Features

  Help Page - error

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System Feature Error Stream Redirection Purpose Redirection of contents of error streams Syntax 2[h]> <file> | $<str_var_name> | { <inline_command> } | NULL 2[h]>> <file> | $<str_var_name> | { <inline_command> } | NULL Arguments <file> Name or path of a file to which error is to be written. It can be a name relative to the current directory, or full path name. <str_var_name> Name of a string variable to which error is to be written. The variable must be declared prior to its use. Also, the variable must of type str. <inline_command> The output of the inline command specifies the redirection target. NULL Error will be ignored. Description The error stream is written to the redirection target after processing the current command. If a single > is used, the original contents of redirection target will be erased. This is called overwrite mode. If a double >> is used, the original contents will be preserved and the error from current command will be appended to the original contents. This is called append mode. If an h (lower case letter h) is specified immediately before the > or >>, the data is assumed to be in hexadecimal representation, and it will be converted to binary bytes before writing the data. If file does not exist, it will be created. If NULL is specified, any errors will be ignored (and not written anywhere). If error redirection is not specified, the errors will be written to screen. This does not apply to batch mode, since the screen is not available during batch mode. Restrictions Redirection is not allowed in the following commands. function return end set if else endif while do done If redirection is specified on these commands, it will be ignored. If inline command is used for redirection, it must result in one (and only one) file name or variable name. Valid Examples len "myfile.cpp" 2> errfile.txt Error from the len command will be written to errfile.txt. The original contents of errfile.txt, if any, will be lost. len myfile.cpp 2>> errfile.txt Error from the len command will be appended to the original contents of errfile.txt. Invalid Examples set $wordCount=100 2>errFile.txt Will produce an error. Redirection is not allowed in set command. See Also stream inline input output

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