Editing DIGITAL Command Language (section)

==Lexical functions==
'''Lexical functions''' provide string functions and access to VMS-maintained data.

Some Lexicals are:
* {{code|F$EXTRACT(start,length,string)}} {{--}} extract a substring
* {{code|F$CVTIME}} {{--}} obtain date/time info, e.g. 
*: {{code|lang=powershell|1=YEST_DOW=F$EXTRACT(0,3,F$CVTIME(DATE_EXPR,,"WEEKDAY"))}}
* {{code|F$ELEMENT(0," ",ABC_DEF)}} {{--}} for {{code|ABC_DEF {{=}} "ABC DEF"}} would return {{code|"ABC"}}
* {{code|F$SEARCH}} {{--}} searches for a file, returns a null ("") if not found
* {{code|F$LOCATE(needle,haystack)}}
* {{code|F$SetPRV("BYPASS,CMKRNL,ALTPRI")}} {{--}} it's a privilege to have access to this.