Globally replace text in several files: Difference between revisions
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{{task}}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. |
{{task}}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. |
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=={{header|AutoHotkey}}== |
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<lang AutoHotkey>SetWorkingDir %A_ScriptDir% ; Change the working directory to the script's location |
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listFiles := "a.txt|b.txt|c.txt" ; Define a list of files in the current working directory |
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loop, Parse, listFiles, | |
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{ |
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; The above parses the list based on the | character |
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fileread, contents, %A_LoopField% ; Read the file |
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fileDelete, %A_LoopField% ; Delete the file |
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stringReplace, contents, contents, Goodbye London!, Hello New York!, All ; replace all occurrences |
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fileAppend, %contents%, %A_LoopField% ; Re-create the file with new contents |
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} |
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</lang> |
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=={{header|C++}}== |
=={{header|C++}}== |
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<lang c++>#include <fstream> |
<lang c++>#include <fstream> |
Revision as of 21:36, 29 January 2011
You are encouraged to solve this task according to the task description, using any language you may know.
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.
AutoHotkey
<lang AutoHotkey>SetWorkingDir %A_ScriptDir% ; Change the working directory to the script's location listFiles := "a.txt|b.txt|c.txt" ; Define a list of files in the current working directory loop, Parse, listFiles, | { ; The above parses the list based on the | character fileread, contents, %A_LoopField% ; Read the file fileDelete, %A_LoopField% ; Delete the file stringReplace, contents, contents, Goodbye London!, Hello New York!, All ; replace all occurrences fileAppend, %contents%, %A_LoopField% ; Re-create the file with new contents } </lang>
C++
<lang c++>#include <fstream>
- include <iterator>
- include <boost/regex.hpp>
- include <string>
- include <iostream>
int main( int argc , char *argv[ ] ) {
boost::regex to_be_replaced( "Goodbye London\\s*!" ) ; std::string replacement( "Hello New York!" ) ; for ( int i = 1 ; i < argc ; i++ ) { std::ifstream infile ( argv[ i ] ) ; if ( infile ) {
std::string filetext( (std::istreambuf_iterator<char>( infile )) , std::istreambuf_iterator<char>( ) ) ; std::string changed ( boost::regex_replace( filetext , to_be_replaced , replacement )) ; infile.close( ) ; std::ofstream outfile( argv[ i ] , std::ios_base::out | std::ios_base::trunc ) ; if ( outfile.is_open( ) ) { outfile << changed ; outfile.close( ) ; }
} else
std::cout << "Can't find file " << argv[ i ] << " !\n" ;
} return 0 ;
}</lang>
J
If files
is a variable with the desired list of file names:
<lang j>require'strings' (1!:2~rplc&('Goodbye London!';'Hello New York!')@(1!:1))"0 files</lang>
Perl
<lang bash>perl -pi -e "s/Goodbye London\!/Hello New York\!/g;" a.txt b.txt c.txt</lang>
PicoLisp
<lang PicoLisp>(for File '(a.txt b.txt c.txt)
(call 'mv File (tmp File)) (out File (in (tmp File) (while (echo "Goodbye London!") (prin "Hello New York!") ) ) ) )</lang>
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")
Python
From Python docs. (Note: in-place editing is not supported on Windows 8.3 operating systems).
<lang python>import fileinput
for line in fileinput.input(inplace=True):
print(line.replace('Goodbye London!', 'Hello New York!'), end=)
</lang>
Ruby
Like Perl:
ruby -pi -e "gsub('Goodbye London!', 'Hello New York!')" a.txt b.txt c.txt
Tcl
<lang tcl>package require Tcl 8.5 package require fileutil
- Parameters to the replacement
set from "Goodbye London!" set to "Hello New York!"
- Which files to replace
set fileList [list a.txt b.txt c.txt]
- Make a command fragment that performs the replacement on a supplied string
set replacementCmd [list string map [list $from $to]]
- Apply the replacement to the contents of each file
foreach filename $fileList {
fileutil::updateInPlace $filename $replacementCmd
}</lang>
TUSCRIPT
<lang tuscript> $$ MODE TUSCRIPT files="a.txt'b.txt'c.txt"
BUILD S_TABLE search = ":Goodbye London!:"
LOOP file=files
ERROR/STOP OPEN (file,WRITE,-std-) ERROR/STOP CREATE ("scratch",FDF-o,-std-) ACCESS q: READ/STREAM/RECORDS/UTF8 $file s,aken+text/search+eken ACCESS s: WRITE/ERASE/STREAM/UTF8 "scratch" s,aken+text+eken LOOP READ/EXIT q IF (text.ct.search) SET text="Hello New York!" WRITE/ADJUST s ENDLOOP ENDACCESS/PRINT q ENDACCESS/PRINT s ERROR/STOP COPY ("scratch",file) ERROR/STOP CLOSE (file)
ENDLOOP ERROR/STOP DELETE ("scratch") </lang>