Find Non-UTF8 Filenames on Linux File System - regex

I have a number of files hiding in my LANG=en_US:UTF-8 filesystem that have been uploaded with unrecognisable characters in their filename.
I need to search the filesystem and return all filenames that have at least one character that is not in the standard range (a-zA-Z0-9 and .-_ etc.)
I have been trying to following but no luck.
find . | egrep [^a-zA-Z0-9_\.\/\-\s]
I'm using Fedora Code 9.

convmv might be interesting to you. It doesn't just find those files, but also supports renaming them to correct file names (if it can guess what went wrong).

find . | perl -ne 'print if /[^[:ascii:]]/'

find . | egrep [^a-zA-Z0-9_./-\s]
Danger, shell escaping!
bash will be interpreting that last parameter, removing one level of backslash-escaping. Try putting double quotes around the "[^group]" expression.
Also of course this disallows a lot more than UTF-8. It is possible to construct a regex to match valid UTF-8 strings, but it's rather ugly. If you have Python 2.x available you could take advantage of that:
import os.path
def walk(dir):
for child in os.listdir(dir):
child= os.path.join(dir, child)
if os.path.isdir(child):
for descendant in walk(child):
yield descendant
yield child
for path in walk('.'):
try:
u= unicode(path, 'utf-8')
except UnicodeError:
# print path, or attempt to rename file

I had a similar problem to the OP for which I was given a solution on Superuser (see also further comments) that I found more satisfactory than the "convmv solution", although I appreciate to have discovered comvmv too.

Related

replace part of file name with wrong encoding

Need some guidance how to solve this one. Have 10 000s of files in multiple subfolders where the encoding got screwed up. Via ls command I see a filename named like this 'F'$'\366''ljesedel.pdf', that includes the ' at beginning and end. That's just one example where the Swedish characters åäö got wrong, in this example this should have been 'Följesedel.pdf'. If If I run
#>find .
Then I see a list of files like this:
./F?ljesedel.pdf
Not the same encoding. How on earth solving this one? The most obvious ways:
myvar='$'\366''
char="ö"
find . -name *$myvar* -exec rename 's/$myvar/ö' {} \;
and other possible ways fails since
find . -name cannot find it due to the ? instead of the "real" characters " '$'\366'' "
Any suggestions or guidance would be very much appreciated.
The first question is what encoding your terminal expects. Make sure that is UTF-8.
Then you need to find what bytes the actual filename contains, not just what something might display it as. You can do this with a perl oneliner like follows, run in the directory containing the file:
perl -E'opendir my $dh, "."; printf "%s: %vX\n", $_, $_ for grep { m/jesedel\.pdf/ } readdir $dh'
This will output the filename interpreted as UTF-8 bytes (if you've set your terminal to that) followed by the hex bytes it actually contains.
Using that you can determine what your search pattern should be. Your replacement must be the UTF-8 encoded representation of ö, which it will be by default as part of the command arguments if your terminal is set to that.
I'm not an expert - but it might not be a problem with the file name (which seems to hold the correct Unicode file name) - but with the way ls (and many other utilities) show the name to the terminal.
I was able to show the correct name by setting the terminal character encoding to Unicode. Also I've noticed the GUI programs (file manager, etc), were able to show the correct file name.
Gnome Terminal: "Terminal .. set character encoding - Unicode UTF8
It is still a challenge with many utilities to 'select' those files (e.g., REGEXP, wildcard). In few cases, you will have to select those character using '*' pattern. If this is a major issue considering using Ascii only - may be use the 'o' instead of 'ö'. Not sure if this is acceptable.

export filenames to temp file bash

I have a lot of files in multiple directories that all have the following setup for the filename:
prob123456_01
I want to delete the trailing "_01" off of each file name and export them to a temp file. How exactly would I delete the trailing "_01" as well as export? I am rather new to scripting so any help would be greatly appreciated!
As you've tagged with bash, I'll assume that you can use globstar
shopt -s globstar # enable globstar
for f in **_[0-9][0-9]; do echo "${f%_*}"; done > tmp
With globstar enabled, the pattern **_[0-9][0-9] matches any file ending in _, followed by any 2 digit number, in the current directory and any subdirectories. ${f%_*} removes the end of the file name using bash's built-in string manipulation functionality.
Better yet, as Charles Duffy suggests (thanks), you can use an array instead of a loop:
files=( **_[0-9][0-9] ); printf '%s\n' "${files[#]%_*}"
The array is filled the filenames that match the same pattern as before. ${files[#]%_*} removes the last part from each element of the array and passes them all as arguments to printf, which prints each result on a separate line.
Either of these approaches is likely to be quicker than using find as everything is done in the shell, without executing any separate processes.
Previously I had suggested to use the pattern **_{00..99}, although this is not ideal for a couple of reasons. It is less efficient, as it expands to **_00, **_01, **_02, ..., **_99. Also, any of those 100 patterns that don't match will be included literally in the output unless another option, nullglob is enabled.
It's up to you whether you use [0-9] or [[:digit:]] but the advantage of the latter is that it matches all characters defined to be a digit, which may vary depending on your locale. If this isn't a concern, I would go with the former.
If I understand you correctly, you want a list of the filenames without the trailing _01. The following would do that:
find . -type f -name '*_01' | sed 's/_01$//' > tmp.lst
find . -type f -name '*_01' looks for all the files in the current directory, and its descendent directories, for files with names ending in _01.
| is the so-called pipe, handing the results of the left-hand call to the right-hand call.
sed 's/_01$//' removes the _01 from the end of each filename.
> tmp.lst writes the result into the file tmp.lst
These are all pretty basic parts of working with bash and its likes, so it might be a good idea to look at a tutorial or two and familiarize yourself with those and a few others ;)

extract audio from certain files in working dir in perl

Basically, what I'm trying to do is extract the audio from a set of downloaded YouTube videos, the names of which are (partially) identified in a file (mus.txt) that was opened with the handle TXTFILELIST. TXTFILELIST contains one 11-character identifier for the video on each line (for example, "dQw4w9WgXcQ") and the downloaded file is of the form [title]-[ID].mp4 (in the previous example, "Rick Astley - Never Gonna Give You Up-dQw4w9WgXcQ.mp4").
#snip...
if ($opt_extract_audio) {
open(TXTFILELIST, "<", "mus.txt") or die $!;
my #all_dir_files = `dir /b`;
my $file_to_convert;
foreach $file_to_convert (<TXTFILELIST>) {
my #files = grep("/${file_to_convert}\.mp4$/", #all_dir_files); #the problem line!
print "files: #files\n";
foreach $file (#files) {
system("ffmpeg.exe -i ${file} -vn -y -acodec pcm_s16le -ac 2 ${file}.wav");
}
}
#snip...
The rest of the snipped code works (I checked it with several videos, replacing vars, commenting, etc.), is legal (I used the strict and warnings pragmas) and, I believe, is irrelevant, because it has nothing to do with defining any vars (besides $opt_extract_audio) used in this snippet. However, this is the one bit of code that's giving me trouble; I can't seem to extract the files that are identified in TXTFILELIST from #all_dir_files. I got the code for 'the problem line' from other Stack Overflow answerers, but it isn't working for some reason.
TL;DR What I want to do is this: list all files in the current dir (say the directory contains mus.txt, "Rick Astley - Never Gonna Give You Up-dQw4w9WgXcQ.mp4", and blah.mp4), choose only the identified file(s) (the Rick Astley video) using the 11-char ID in TXTFILELIST (dQw4w9WgXcQ) and extract the audio from it. And yes, I am running this script on Windows, so I can't use *nix utilities like ack or find.
Remove the line
my #all_dir_files = `dir /b`;
And use this loop instead:
for my $file (<*${file_to_convert}.mp4>) {
say $file;
system(...);
}
The <...> above is a glob, can also be written glob "${file_to_convert}.mp4". I think it is almost always better to use perl functions rather than rely on system calls.
As has been pointed out, "/${file...$/" is not a regex, but a string. And since you can use expressions with grep, and a non-empty string is always true, your grep will essentially do nothing, and pass all the values into your array.
Get rid of the double quotes around the regular expression in the grep function.

Text editor that searches within search results

Does anyone know of a text editor that searches within search results using regex?
I would like to perform a regex search on several text files and get a list of matches and then apply another regex search on the search results to further narrow down results. I would prefer a Windows GUI editor rather than a specialized editor with a steeper learning curve like Vim or Emacs.
You might want to look at PowerGrep. It's not exactly a text editor, but you can open files containing your search results within its built-in text editor, and edit stuff there.
The main thing though is that it allows you to search using a regex (or list of regexes), then apply an additional regex to each search result, before returning a 'final' result, which I believe is what you are asking for. Kind of hard to explain, but maybe you get the idea.
The only problem with PowerGrep is that its UI is not very good. To say it takes some getting used to is an understatement. But once you figure it out, you can do a lot of powerful stuff (search/replace, data collection, etc on multiple files whose file names can also be regexes).
The companion product EditPadPro by the same company is also a great editor that has a really good regex engine built-in (probably the same one as in PowerGrep), but it doesn't allow you to do the 'regex-applied-to-a-regex-result' that I think you are asking for.
Do you want list of files in which text matches both reg.exps or a list of lines?
In the first case you can do :
{ grep -l -R 'pattern1' * ; grep -l -R 'pattern2' * } | sort | uniq -d
Note that with Windows you can get those binaries from GnuWin32 and use nearly the same syntax in a batch file:
( grep -l -R "pattern1" *
grep -l -R "pattern2" *
) | sort | uniq -d
In the last case you can with vim use my answer to narrow quickfix results with reg.exp.
Of course you can also copy your search results to a buffer and do some linewise filtering.

Regular Expression to find files with various extensions like-ASPX,ASCX,.js,.rpt,.xml

Is there any way to write a RegEx which can be used to find files with different Extensions.
This works in Bash:
find . -regex '.*\\.\\(pdf\|chm\|doc\\)'
Assuming you have a list of files and you are looking for .pdf, .chm and .doc, you can check it with:
\.pdf$|\.chm$|\.doc$
Regex above should work if you will check it against single filenames.
I'm sure there is, but the question you should be asking is "What's the best way to find files which have specific extensions?".
Regular expressions are not the best answer to every question.
I would suggest just getting a list of all files and passing them into a function like IsThisFileOneIWant(fileName,extensionList). That's far easier than trying to shoehorn the use of regular expressions into your problem.
Something like this should do it:
function IsThisFileOneIWant(fileName,extensionList):
for each extension in extensionList:
if fileName.endsWith (extension):
return true
return false
Done in pseudo-code since it should be simple enough to turn into any other language.
If you must have a regex, it's going to look something like (based on the values in your question):
"ASPX$|ASCX$|\.js$|\.rpt$|\.xml$"
but it depends entirely on the RE engine that you want to use. For example, here's the output from an egrep command in my work directory:
pax#paxbox1:~/work$ ls -1 | egrep '\.sh$|\.c$'
backup0.sh
backup1.sh
eclipse.sh
monbt.sh
qq.c
qq.sh
xx yy.sh