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FizzyWidget
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 Posted: Wed Jan 25, 2012 8:45 am Post subject: Rename files but not extensions? |
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Seeing as I am moving from Windows to Linux, I am trying to remove the spaces and . I have put into filenames and folders, is there a way using bash to change the spaces and .'s to _ but leaving the extensions of the files untouched?
eg
some folder name - some.folder.name = some_folder_name or Some_Folder_Name
some file name.jpg - some.file.name.jpg = some_file_name.jpg
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Bones McCracker
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| Posted: Wed Jan 25, 2012 11:00 am Post subject: |
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Yes.
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Naib
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| Posted: Wed Jan 25, 2012 11:06 am Post subject: |
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for f in *; do mv "$f" $(echo $f | tr ' ' '_'); done
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FizzyWidget
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| Posted: Wed Jan 25, 2012 11:07 am Post subject: |
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Thanks naib 
guessing for .'s i would change it to
for f in *; do mv "$f" $(echo $f | tr '.' '_'); done
?
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Naib
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| Posted: Wed Jan 25, 2012 11:10 am Post subject: |
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yup, but that could mangle any extension as well. you can make it perserve extesion via a small tweak
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FizzyWidget
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| Posted: Wed Jan 25, 2012 11:11 am Post subject: |
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i dont know how to script, only been on linux full time 3 days so far, how would i tweak it to leave extension alone?
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frostschutz
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| Posted: Wed Jan 25, 2012 11:22 am Post subject: Re: Rename files but not extensions? |
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| Dark Foo wrote: | | Seeing as I am moving from Windows to Linux, I am trying to remove the spaces and . |
I don't get it. Linux can handle spaces and dots fine. Why do you want to mangle your filenames? |
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Bones McCracker
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| Posted: Wed Jan 25, 2012 11:27 am Post subject: |
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Something like this:
| Code: | for file in *; do
base=${file%.*} #isolate filename base
ext=${file##*.} #preserve filename extension
base=${base/ /_} #convert spaces to underscore
base=${base/./_} #convert dot to underscore
mv $file $base$ext #rename the file
done |
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| patrix_neo wrote: | The human thought: I cannot win.
The ratbrain in me : I can only go forward and that's it. |
Last edited by Bones McCracker on Wed Jan 25, 2012 11:29 am; edited 1 time in total |
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John R. Graham
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| Posted: Wed Jan 25, 2012 11:30 am Post subject: |
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| BoneKracker wrote: | | Something like this... |
So many quoting errors, so little time. 
- John
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Bones McCracker
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| Posted: Wed Jan 25, 2012 11:41 am Post subject: |
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| John R. Graham wrote: | | BoneKracker wrote: | | Something like this... |
So many quoting errors, so little time.
- John |
I said "something like". I'm not at my linux machine at the moment.
Are they in fact errors (in bash), or just you being obsessive-compulsive? 
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| patrix_neo wrote: | The human thought: I cannot win.
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John R. Graham
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| Posted: Wed Jan 25, 2012 11:55 am Post subject: |
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Not bash syntax errors but errors nonetheless. Properly handling file names with spaces in them requires careful attention to quoting.
Now, that obsessive-compulsive question is a whole different issue. 
- John
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Bones McCracker
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| Posted: Wed Jan 25, 2012 12:10 pm Post subject: |
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| John R. Graham wrote: | Not bash syntax errors but errors nonetheless. Properly handling file names with spaces in them requires careful attention to quoting.
- John |
I don' tthink there are any quoting errors. I think the string substitution won't work, because it will only replace the first character of each type (space or dot).
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| patrix_neo wrote: | The human thought: I cannot win.
The ratbrain in me : I can only go forward and that's it. |
Last edited by Bones McCracker on Wed Jan 25, 2012 12:27 pm; edited 1 time in total |
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Naib
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| Posted: Wed Jan 25, 2012 12:25 pm Post subject: |
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well I wouldn't have named a variable "file" this is a bash command.
so for f in *
Also you are missing recreating the extension "." you changed all . to _ so it would have been: "test one.two.txt" ==> "test_one_two_txt"
The main concern would have been quotes around any variable expansion
| Code: |
for f in *; do
mv "$f" "$(echo ${f%.*} | tr ". " "_").${f##*.} "
done |
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Last edited by Naib on Wed Jan 25, 2012 12:34 pm; edited 1 time in total |
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Bones McCracker
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| Posted: Wed Jan 25, 2012 12:33 pm Post subject: |
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| Naib wrote: | well I wouldn't have named a variable "file" this is a bash command.
so for f in *
The main concern would have been quotes around any variable expansion
| Code: |
for f in *; do
base="${f%.*}" #isolate filename base
ext="${f##*.} " #preserve filename extension
base="${base/ /_}" #convert spaces to underscore
base="${base/./_}" #convert dot to underscore
mv "$f" "$base$ext" #rename the file
done |
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I use file as a variable name frequently, but you're probably right. I probably shouldn't use base either.
Also, as I said above, the character substitution wont' work; it will only convert the first occurrence. It should be (note double slashes in pattern):
| Code: | for f in *; do
b=${f%.*}
e=${f##*.}
b=${b// /_}
b=${b//./_}
echo $b.$e
done |
_________________
| patrix_neo wrote: | The human thought: I cannot win.
The ratbrain in me : I can only go forward and that's it. |
Last edited by Bones McCracker on Wed Jan 25, 2012 12:35 pm; edited 1 time in total |
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Naib
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| Posted: Wed Jan 25, 2012 12:34 pm Post subject: |
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ninja edit with a more compact solution plus an additional error in your "pseudocode"
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Bones McCracker
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| Posted: Wed Jan 25, 2012 12:36 pm Post subject: |
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| Naib wrote: | | ninja edit with a more compact solution plus an additional error in your "pseudocode" |
No, it's not simply a "more compact solution". You missed the primary change. It will no longer only change the first character; it will change them all.
I changed the filenames out of respect for your suggestion.
If the error you were talking about was the lack of a dot in the final filename, before the extension, I fixed that.
Edit: oh, and the final line should be changed back from 'echo' to 'mv $f', after testing.
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| patrix_neo wrote: | The human thought: I cannot win.
The ratbrain in me : I can only go forward and that's it. |
Last edited by Bones McCracker on Wed Jan 25, 2012 12:38 pm; edited 1 time in total |
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Naib
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| Posted: Wed Jan 25, 2012 12:38 pm Post subject: |
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wait what? my solution is compact oO and yes it will change all occurrences since that is required (yes you pseudo wouldn't have)
all . and " " changed to "_" with file extension preservation in 1 line
| Code: | | for f in *; do mv "$f" "$(echo ${f%.*} | tr ". " "_").${f##*.}"; done |
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Bones McCracker
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| Posted: Wed Jan 25, 2012 12:42 pm Post subject: |
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| Naib wrote: | wait what? my solution is compact oO
all . and " " changed to "_" with file extension preservation in 1 line
| Code: | | for f in *; do mv "$f" "$(echo ${f%.*} | tr ". " "_").${f##*.}"; done |
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Nice and readable too.
He said he wanted to do it in bash. Calling tr is almost like calling sed (it's like two thirds the size of it).
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| patrix_neo wrote: | The human thought: I cannot win.
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Naib
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| Posted: Wed Jan 25, 2012 12:47 pm Post subject: |
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well tr is part of coreutils
but in pure bash, you // for all replace would do:
| Code: | | for f in *; do t="${f// /_}"; mv "$f" "${t//./_}.${f##*.}"; done |
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Bones McCracker
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| Posted: Wed Jan 25, 2012 12:51 pm Post subject: |
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| Naib wrote: | wait what? my solution is compact oO and yes it will change all occurrences since that is required (yes you pseudo wouldn't have)
all . and " " changed to "_" with file extension preservation in 1 line
| Code: | | for f in *; do mv "$f" "$(echo ${f%.*} | tr ". " "_").${f##*.}"; done |
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No, my solution works (changes all occurrences), and it's entirely in bash, and it's readable.
| Code: | for f in *; do
b=${f%.*}
e=${f##*.}
b=${b// /_}
b=${b//./_}
mv $f $b.$e
done |
Also, echoing to a pipe is a sure sign of an amateur. If you're echoing to a pipe, you're doing something wrong.
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| patrix_neo wrote: | The human thought: I cannot win.
The ratbrain in me : I can only go forward and that's it. |
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John R. Graham
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| Posted: Wed Jan 25, 2012 12:59 pm Post subject: |
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I stand corrected on the quoting. Didn't know that a variable expansion was treated atomically. However, | Code: | ~ $ f="b.c.d.e"
~ $ e=${f##.*}
~ $ echo $e
b.c.d.e |
- John
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Naib
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| Posted: Wed Jan 25, 2012 1:04 pm Post subject: |
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| BoneKracker wrote: | | Naib wrote: | wait what? my solution is compact oO and yes it will change all occurrences since that is required (yes you pseudo wouldn't have)
all . and " " changed to "_" with file extension preservation in 1 line
| Code: | | for f in *; do mv "$f" "$(echo ${f%.*} | tr ". " "_").${f##*.}"; done |
|
No, my solution works (changes all occurrences), and it's entirely in bash, and it's readable.
| Code: | for f in *; do
b=${f%.*}
e=${f##*.}
b=${b// /_}
b=${b//./_}
mv $f $b.$e
done |
Also, echoing to a pipe is a sure sign of an amateur. If you're echoing to a pipe, you're doing something wrong. |
one could also say liberal use of temporary variables or over reuse to cascade formatting is also a sign of an amateur, read my last on
| Code: | | for f in *; do t="${f// /_}"; mv "$f" "${t//./_}.${f##*.}"; done |
pure bash, 1 temp, no re-assignment, no pipes
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Bones McCracker
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| Posted: Wed Jan 25, 2012 1:08 pm Post subject: |
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| Naib wrote: | | BoneKracker wrote: | | Naib wrote: | wait what? my solution is compact oO and yes it will change all occurrences since that is required (yes you pseudo wouldn't have)
all . and " " changed to "_" with file extension preservation in 1 line
| Code: | | for f in *; do mv "$f" "$(echo ${f%.*} | tr ". " "_").${f##*.}"; done |
|
No, my solution works (changes all occurrences), and it's entirely in bash, and it's readable.
| Code: | for f in *; do
b=${f%.*}
e=${f##*.}
b=${b// /_}
b=${b//./_}
mv $f $b.$e
done |
Also, echoing to a pipe is a sure sign of an amateur. If you're echoing to a pipe, you're doing something wrong. |
one could also say liberal use of temporary variables or over reuse to cascade formatting is also a sign of an amateur, read my last on
| Code: | | for f in *; do t="${f// /_}"; mv "$f" "${t//./_}.${f##*.}"; done |
pure bash, 1 temp, no re-assignment, no pipes |
All you did what take mine and compress it to unreadability. But that conciseness would be desirable if somebody was trying to use 'find' to do this (like if the files were scattered all over the disk) with an -exec and shell command.
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| patrix_neo wrote: | The human thought: I cannot win.
The ratbrain in me : I can only go forward and that's it. |
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FizzyWidget
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| Posted: Wed Jan 25, 2012 2:20 pm Post subject: |
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Yes i will be using bash, is there another shell that i should be using? Only using that one because i followed the handbook, which ever is suggested i can use
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RazielFMX
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| Posted: Wed Jan 25, 2012 2:43 pm Post subject: |
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1) Copy and paste the following into a file, say ~/stripSpaces.pl
| Code: | #!/usr/bin/perl -w
use strict;
use Cwd qw(getcwd);
use File::Copy qw(move);
my $dir = getcwd();
opendir(DIR, $dir) or die $!;
my $exitCode = 0;
while (my $file = readdir(DIR)) {
next if ($file !~ /\s+/o); # Don't bother with things that lack spaces
my $new;
if ($file =~ /^(.+)\.(\S+)$/o) {
my $base = $1;
my $ext = $2;
$base =~ s/\s/_/go;
$new = join('.', $base, $ext);
} else {
($new = $file) =~ s/\s/_/go;
}
print STDERR "[INFO] Renaming '$file' to '$new'\n";
my $check = move($file, $new);
if (! $check) {
print STDERR "[WARN] Unable to rename '$file' to '$new': $!\n";
# File::Copy::Move can leave artifacts on the FS
if (-e $new) {
unlink $new;
}
$exitCode = -1 if ($exitCode == 0);
}
}
closedir(DIR);
exit($exitCode); |
2) chmod it: chmod 755 ~/stripSpaces.pl
3) Run it in the directory you want to. |
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