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  Help Page - SS_ExtractLines

( 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. )




Sample Script SS_ExtractLines Purpose Extracts lines in a specified range from a given file. Source Code ##################################################################### # SCRIPT: SS_ExtractLines # # This script extracts the specified lines from a file. # # The name of the file from which lines are to be extracted # is assigned using FVA (Forward Variable Assignment) for # variable file is of form # "C:/abc/x.txt" or "./x.txt" # # The start line is assigned using FVA for str variable $from. The # value is of the form "1", "2", etc. If no value supplied, "1" is assumed. # # The end line is assigned using FVA for int variable $to. The # value is of the form "1", "100", etc. If no value is supplied, "l" (Ell-last line) is assumed. # # Note that $from and $to are str variables. If you are passing int values, use the makestr() function # as follows. # from(makestr(int(1))) to(makestr(int(5))) # # This script can be stored and edited as necessary, in a text file # called SS_ExtractLines.txt, in a directory that is in your $path. # The script can then be called as # # script SS_ExtractLines.txt file("mypage.html") from("1") to("5") # # ##################################################################### # Declare FVA variables. var str file var str from var str to # Set start and end lines to default values if not assigned. if ($from=="") set $from="1" endif if ($to=="") set $to="l" endif # Collect the content of $file in $content var str content # Content of one file at a time repro $file > $content # If the user did not assign $file, $content will be empty. # Note that this script uses -e option for lex command. # This is done so that the line numbers will be correctly # accounted for. You may wish to edit the script to remove # the -e option, if that suits your purpose better. # Strip off all lines after $to. var str lexArg set $lexArg = $to+"[" # This will make the argument to lex command of form "n[". # That means lex will extract all lines after the first # n lines. lex -e $lexArg $content >null # We do not want to see the output, just change $content. # If the user has passed a negative value for $to, the lex command will # produce an error, and will not strip any lines. # Strip off all lines before $from. # We will use the same str variable $lexArg declared above. set $lexArg = "]"+$from # This will make the argument to lex command of form "]n". # That means lex will extract all line before the n'th line. # If the user has passed a negative value for $from, the lex command will # produce an error, and will not strip any lines. lex -e $lexArg $content >null # As before, we do not want to see the output. # If the user has passed a negative value for $from, the lex command will # produce an error, and will not strip any lines # We are done. Return the content. echo $content

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