Fastest way to rename filenames with space to dash in linux

I want to mass rename hundred of filenames like
filename 001.jpg to filename-001.jpg



filename 099.jpg to filename-099.jpg

I use this command to rename all in few seconds in my MacBook Pro.
I think it is fine to run in any linux.
[code lang=”bash”]
for f in *\ *; do mv "$f" "${f// /-}"; done
[/code]

Show Image Size in Terminal or Shell

The easiest way to show the file size in Terminal in Mac or Linux.
[code lang=”bash”]
ustins-MacBook-Pro:jpg juzhax$ file 001.jpg
001.jpg: JPEG image data, EXIF standard
Justins-MacBook-Pro:jpg juzhax$ identify 001.jpg
001.jpg JPEG 720×468 720×468+0+0 8-bit sRGB 59.8KB 0.000u 0:00.009
Justins-MacBook-Pro:jpg juzhax$
[/code]

command c expects followed by text error in Mac

You received error from the sed command in Mac, because the argument in mac is different.
If you type in Mac terminal, you may receive error like this
[code lang=”bash”]
Justins-MacBook-Pro:2 juzhax$ sed -i ‘s/old_text/new_text/g’ example.txt
sed: 1: "config.php": command c expects \ followed by text
[/code]

The first argument should be the extension of the backup file. The correct way is
[code lang=”bash”]
Justins-MacBook-Pro:2 juzhax$ sed -i ‘.bak’ ‘s/old_text/new_text/g’ example.txt
[/code]

or

[code lang=”bash”]
Justins-MacBook-Pro:2 juzhax$ sed -i ‘.original’ ‘s/old_text/new_text/g’ example.txt
[/code]

If you don’t want any backup file, you can do like this.
[code lang=”bash”]
Justins-MacBook-Pro:2 juzhax$ sed -i ” ‘s/old_text/new_text/g’ example.txt
[/code]