On 22Sep2018 14:09, Roger Heflin <rogerheflin@xxxxxxxxx> wrote:
If you have the original disk and can mount the filesystem then do this:
create a script like this and call it say /dir/testcatfile:
cat $1 > /dev/null
RC=$?
if [ ${RC} != 0 ] ; then
echo "$1 is corrupt"
fi
Just a shell remark: because the shell considers any command to be a predicate,
you can just go:
cat "$1" >/dev/null || echo "$1 is corrupt"
i.e. assert the truth of the "cat" invocation (truth means success). Since "||"
is short circuiting OR, just like C, the OR expression tries the first
predicate (cat), and only tries the second if the first is false.
Truth or consequences.
chmod +x /dir/testcatfile
Then do this:
find /tmp -type f -exec /dir/testcatfile {} \;
each file it gets an io error on will print out a message.
You can make this considerably faster via xargs:
find /path/to/your/drive -type f -print0 \
| xargs -0 cat -- >/dev/null 2>cat-errors.txt
which will try to cat everything in batches and report errors to
"cat-errors.txt" for later review.
It should be substantially faster than the "find ... -exec script" version.
Cheers,
Cameron Simpson <cs@xxxxxxxxxx>
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