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  Help Page - len

( 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. )




Command len Purpose Editor - Line enumerator or counter Aliases lineenumerator, lineenum, len Syntax len [ <options> ] <input_string> Options -e Count empty lines. Without this option, empty lines are not considered. -c Case insensitive. Case will be ignored when considering separator characters. Arguments <input_string> The input string on which this command will operate. It can be specified as a str constant or str variable or an expression resulting in a str value. If a str constant is used, we highly recommend using double quotes around it, such as "John Doe". Without the double quotes, the spaces in the input string will produce errors or erroneous output. Stream Input Stream input is ignored. Stream Output The number of lines found are written here. Stream Error Any errors are listed here. Description The command enumerates (or counts) lines in the <input_string> and writes the count to the stream output or redirected stream output. The command CAN ALSO BE USED WITH FILES. Simply read in the contents of the file using the repro command into a str variable, then use that str variable as <input_string>. The command uses system variable $lsep. This variable lists line separators. Each character in $lsep is assumed to end a line. See help page for systemvar for details on this system variable. You are free to change the values of any system variables. It is, however, highly recommended that you restore their values to their previous values. This can be done as follows. # Save previous value. var str saved_lsep set $saved_lsep = $lsep set $lsep = < new_value > ... < DO_your_stuff > ... # Restore value set $lsep = $saved_lsep System variables are used by many commands, and incorrect setting of their values may affect the operation of these commands. Restrictions None. Valid Examples Assume that you want to count lines in a file myfile.js. var str content repro myfile.js >$content len -e $content The above code will produce the number of all lines (including empty lines) in file myfile.js. To count just the non-empty lines, do NOT use the -e option, as follows. len $content Invalid Examples len "myfile.js" Will produce 1. That's because myfile.js will be taken verbatim as <input_string>, and there is only one line in that string. len { repro "myfile.js" } Will also produce erroneous results. The inline command { repro "myfile.js" } will execute and bring out its output as part of the len command. The len comand will then consider the first word of the output as <input_string>. So, if the first line of myfile.js is empty, since we did not specify -e option, the output of the len command will be 0. If the first line of myfile.js is not an empty line, the output of the len command will be 1. To correctly count the number of lines in myfile.js, use the code listed above under Valid Examples. See Also systemvar var echo escape lex lin lap lal sen wen chen

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