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How can I rename all *.txt in a directory to *.csv files in the terminal (Mavericks). I tried following inside the directory:

mv *.txt *.csv
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This can be done nicely in AppleScript. Then AppleScript can be called with the Terminal command osascript. – Nicolas Barbulesco Aug 29 '14 at 12:46

You need to loop over all files

for f in *.txt; do
    mv "$f" "${f%.txt}.csv"
done

If you have files with names starting with a . as well you might need to run

for f in *.txt .*.txt; do
    [[ -f "$f" ]] && mv "$f" "${f%.txt}.csv"
done
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6  
You can do it in the shell without calling an external program: mv "$f" "${f%.txt}.csv" – glenn jackman Aug 29 '14 at 12:00
1  
This skips the files starting with . – Nicolas Barbulesco Aug 29 '14 at 13:00
1  
@glennjackman Thanks. I always get the syntax wrong on that one, didn't want to post without having an Unix system to test it on. – patrix Aug 29 '14 at 13:04
    
@NicolasBarbulesco True, but given the special role .something files play in the shell I wouldn't recommend to start file names with a dot anyway. If you really have to, you can always run for f in .*.txt; do instead. – patrix Aug 29 '14 at 13:06
2  
If you want to include dot files, shopt -s dotglob and the file expansion will pick them up. – glenn jackman Aug 29 '14 at 13:09

This also works well:

# change to the Zsh
zsh

# load the built-in zmv function
autoload -U zmv

# rename the files
zmv '(*).txt' '$1.csv'
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But this skips the files starting with . – Nicolas Barbulesco Sep 3 '14 at 8:45
ls *.txt |awk '{print "mv "$1" " substr($1,1,(index($1,".txt")))"csv"}' |sh

Command explanation:

ls *.txt lists files ending with txt

| awk '{print "mv "$1" " substr($1,1,(index($1,".txt")))"csv"} prints the command that allows to rename the previous files listed with txt to csv

| sh executes the previously printed command, thus effectively renaming the files

Note: if you want to list all files including hidden files (those starting with .) use ls -a *.txt instead

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We're looking for long answers that provide some explanation and context. Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed.

    
Care to break it apart (explain it piece by piece) for the non-technical users? – Alex Jan 10 at 10:29

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