Dfyjkt

I prefer to use the command 'rename', which takes Perl-style regexes:

rename "s/ /_/g" *

You can do a dry run with the -n flag:

rename -n "s/ /_/g" *

Use sh...

for i in *' '*; do mv "$i" `echo $i | sed -e 's/ /_/g'`; done

If you want to try this out before pulling the trigger just change mv to echo mv.

What if you want to apply the replace task recursively? How would you do that?

Well, I just found the answer myself. No the most elegant solution (tries to rename also files that do not comply with the condition) but works. (BTW, in my case I needed to rename the files with '%20', not with an underscore)

#!/bin/bash
find . -type d | while read N
do
 (
 cd "$N"
 if test "$?" = "0"
 then
 for file in *; do mv "$file" $file// /%20; done
 fi
 )
done

If you use bash:

for file in *; do mv "$file" $file// /_; done

Quote your variables:

for file in *; do echo mv "'$file'" "$file// /_"; done

Remove the "echo" to do the actual rename.

Try something like this, assuming all of your files were .txt's:

for files in *.txt; do mv “$files” `echo $files | tr ‘ ‘ ‘_’`; done

Here is another solution:

ls | awk 'printf(""%s"n", $0)' | sed 'p; s/ /_/g' | xargs -n2 mv

1. uses awk to add quotes around the name of the file


2. uses sed to replace space with underscores; prints the original name with quotes(from awk); then the substituted name


3. xargs takes 2 lines at a time and passes it to mv

I believe your answer is in Replace spaces in filenames with underscores.

The easiest way to replace a string (space character in your case) with another string in Linux is using sed. You can do it as follows

sed -i 's/s/_/g' *

Hope this helps.

To rename all the files with a .py extension use,

find . -iname "*.py" -type f | xargs -I% rename "s/ /_/g" "%"


Sample output,

$ find . -iname "*.py" -type f 
./Sample File.py
./Sample/Sample File.py
$ find . -iname "*.py" -type f | xargs -I% rename "s/ /_/g" "%"
$ find . -iname "*.py" -type f 
./Sample/Sample_File.py
./Sample_File.py