It can be partially accomplished by piping the lsattr command through the grep command.
lsattr -R | grep +i
However, I believe when you mention the entire ext3 file system the search might involve /proc , /dev and some other directories which might report some errors that you just want to ignore. You can probably run the command as,
lsattr -R 2>/dev/null | grep -- "-i-"
You might want to make the grep a bit more strict by using grep's PCRE facility to more explicitly match the "-i-".
lsattr -R 2>/dev/null | grep -P "(?<=-)i(?=-)"
This will then work for situations such as this:
$ lsattr -R 2>/dev/null afile | grep -P "(?<=-)i(?=-)"
----i--------e-- afile
But is imperfect. If there are additional attributes enabled around the immutable flag, then we'll not match them, and this will be fooled by files whose names happen to match the above pattern as well, such as this:
$ lsattr -R 2>/dev/null afile* | grep -P "(?<=-)i(?=-)"
----i--------e-- afile
-------------e-- afile-i-am
We can tighten up the pattern a bit more like this:
$ lsattr -a -R 2>/dev/null afile* | grep -P "(?<=-)i(?=-).* "
----i--------e-- afile
But it's still a bit too fragile and would require additional tweaking depending on the files within your filesystem. Not to mention as @StephaneChazeles has mentioned in comments that this can be gamed fairly easily by the inclusion of newlines with a files name to bypass the above pattern to grep.
References
https://groups.google.com/forum/#!topic/alt.os.linux/LkatROg2SlM
The solution that works with any POSIX compatible find is the following:
find DIR -type f -perm -0755 ! -perm 0755 ! -perm -04000 ! -perm -02000 -print
As previously noted, with GNU find you can collapse the setuid and setgid tests into ! -perm /06000.
Best Answer
If you want to test for any of the bits, use
/. I.e. for your use case:and:
or combined:
You may use both folders and files as argument for GNU
find.Another, IMO better readable, approach is using the mnemonic shortcuts. I.e.:
Caveat emptor
Keep in mind that the variants of
findvary. They may also behave differently. Always read the friendly manual (RTFM).