Globally replace text in several files
The task is to replace every occuring instance of a piece of text in a group of text files with another one. For this task we want to replace the text "Goodbye London!" with "Hello New York!" for a list of files.
Perl
perl -pi -e "s/Goodbye London\!/Hello New York\!/g;" a.txt b.txt c.txt
PureBasic
<lang PureBasic>Procedure GRTISF(List File$(), Find$, Replace$)
Protected Line$, Out$, OutFile$, i ForEach File$() fsize=FileSize(File$()) If fsize<=0: Continue: EndIf If ReadFile(0, File$()) i=0 ; ; generate a temporary file in a safe way Repeat file$=GetTemporaryDirectory()+base$+"_"+Str(i)+".tmp" i+1 Until FileSize(file$)=-1 i=CreateFile(FileID, file$) If i ; Copy the infile to the outfile while replacing any needed text While Not Eof(0) Line$=ReadString(0) Out$=ReplaceString(Line$,Find$,Replace$) WriteString(1,Out$) Wend CloseFile(1) EndIf CloseFile(0) If i ; If we made a new file, copy it back. CopyFile(file$, File$()) DeleteFile(file$) EndIf EndIf Next
EndProcedure</lang> Implementation
NewList Xyz$() AddElement(Xyz$()): Xyz$()="C:\\a.txt" AddElement(Xyz$()): Xyz$()="C:\\b.txt" AddElement(Xyz$()): Xyz$()="D:\\c.txt" GRTISF(Xyz$(), "Goodbye London", "Hello New York")