Find -Name "*.Xyz" -O -Name "*.Abc" -Exec to Execute on All Found Files, Not Just the Last Suffix Specified

find -name *.xyz -o -name *.abc -exec to Execute on all found files, not just the last suffix specified

find works by evaluating the expressions you give it until it can determine the truth value (true or false) of the entire expression. In your case, you're essentially doing the following, since by default it ANDs the expressions together.

-name "*.xyz" OR ( -name "*.abc" AND -exec ... )

Quoth the man page:

GNU find searches
the directory tree rooted at each given file name by evaluating the
given expression from left to right, according to the rules of precedence (see section OPERATORS), until the outcome is known (the left
hand side is false for and operations, true for or), at which point
find moves on to the next file name.

That means that if the name matches *.xyz, it won't even try to check the latter -name test or -exec, since it's already true.

What you want to do is enforce precedence, which you can do with parentheses. Annoyingly, you also need to use backslashes to escape them on the shell:

find ./ \( -name "*.xyz" -o -name "*.abc" \) -exec cp {} /path/i/want/to/copy/to \;

Delete content of all folders with certain name

To get the * in -exec rm -r "{}/*" expanded you would need to run a shell instead of executing rm directly, but with this option you must be careful not to introduce a command injection vulnerability. (see https://unix.stackexchange.com/a/156010/330217)

Another option is to use -path instead of -name

find . -path '*/build/*' -exec rm -r "{}" \; -prune

Option -prune is to avoid descending into a directory that has been removed before.

Find command, linux

find -type f \( -name "*.avi" -o -name "*.mp4" \) -exec md5sum {} + > checklist.chk

See here for explanation

Finding all files that have whitespace in last few lines

You have to escape the + inside grep expression, ex. see gnu grpe manual.

Using < <(...) shell redirection with process substitution is unneeded here, just pipe it |.

The following works. Notice how I needed to double escape \\+, because \\ is expanded to \ inside " braces.:

find . -type f -exec sh -c 'tail -n 5 "$1" | grep -q " \\+$" && printf "%s\n" "$1"' -- {} \;

However when using xargs you can do it in parallel -P0, also I like the debugging with -t better. For strange filenames add -print0 and -0 options to find and xargs.

find . -type f | xargs -n1 sh -c 'tail -n 5 "$1" | grep -q " \\+$" && printf "%s\n" "$1"' --

Find all files with a filename beginning with a specified string?

Use find with a wildcard:

find . -name 'mystring*'

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