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Lesson 1















Automated Internet

Automated Editors

Sample Scripts

Precompiled Functions

System Features

  Help Page - wal

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Command wal Purpose Editor - Word alterer Aliases wordalterer, wordalt, wal Syntax wal [ <options> ] " [<start_bounder>] <n> [<end_bounder>] " " <alter_string> " <input_string> Options -p Preserve the input string. Without this option, the <alter_string> is replaced into <input_string>. With this option, the <input_string> is left unchanged. -c Case insensitive. Case will be ignored when considering separator characters. -e Consider empty words. 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. In case of a str constant or a str expression, the -p option is assumed. <n> The instance number. The input string will be searched for this instance of the target. Instances are counted from 1. <n> must be either a number higher than 0 or the letter l (which indicates the last instance). <start_bounder> <end_bounder> This argument can either be absent, the character [ or the character ]. The <start_bounder> appears before the <n>. The <end_bounder> appears after the <n>. We will now explain the role of these bounders with an example. We will assume that we are looking for fifth word. "5" Target instance is only the fifth word. "5[" Target instance is everything after but excluding the fifth word. "5]" Target instance is everything upto and including the fifth word. "[5" Target instance is everything beginning with and including the fifth word. "[5[" This combination is INVALID. "[5]" Target instance is only the fifth line. This is same as "5". "]5" Target instance is everything upto but excluding the fifth word. "]5[" This combination is INVALID. "]5]" This combination is INVALID. In all VALID cases, the <alter_string> is substituted (altered) IN PLACE OF the target instance. The quotes in the command syntax are required. Without the double quotes, an error or erroneous output may be produced. <insert_string> The string to substitute (alter) IN PLACE OF the target instance. Stream Input Stream input is ignored. Stream Output The altered input is added to stream output. Stream Error Any errors are listed here. Description The command places (alters) the <alter_string> IN PLACE OF the target instance. The following system variable plays an important role. $wsep Word separator This variable is used to identify, number, and extract distinct words. See the 'systemvar' help topic for its description. You can change its value to highly refine your search procedure. We highly recommend that, if you change any system variable's value, you restore it after the search is complete, as many system variables are often used by more than one command. The command CAN ALSO BE USED WITH FILES. Simply read in the contents of the file using the repro command into a str variable. Perform any desired operations on the str variable, then write the str variable back to the file. The following is an example. var str content # Read file. repro myfile.html > $content # Perform the desire operations on $content. . . . # Write the resulting str variable back to file. echo $content >myfile.html Restrictions Valid Examples var str s ... wal "5" "fifth" $s Will place (alter) "fifth" IN PLACE OF the fifth word. Invalid Examples var int i ... wal "5" "fifth" $i Will produce error. Variable $i is not a str variable. See Also systemvar var echo escape wen wex win wap sal lal chal

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