1.
find / -name "*.exe" -executable -size +1k
oppure
find / -regex ".*\.exe" -executable -size +1k

2.
find / -name "*.c" -size +100c
oppure
find / -regex ".*\.c" -size +100c

3.
find / -type f -regextype posix-extended -regex "(.*A.*a.*)|(.*a.*A.*)" -exec tail -n 3 '{}' \;
oppure
find / -type f -regextype posix-extended -regex "(.*A.*a.*\..*)|(.*a.*A.*\..*)" -exec tail -n 3 '{}' \;
oppure
find / -type f \( -name "*A*a*" -or -name "*a*A*" \) -exec tail -n 3 '{}' \;

4.
Nome senza estensione
find / -mindepth 3 -maxdepth 5 -user quer -size +249c -name "????" -type f -exec wc -c '{}' \;
Nome senza estensione con espressione regolare (saltando il path)
find / -mindepth 3 -maxdepth 5 -user quer -size +249c -regex ".*\/...." -type f -exec wc -c '{}' \;
Nome con qualsiasi estensione
find / -mindepth 3 -maxdepth 5 -user quer -size +249c -name "????.*" -type f -exec wc -c '{}' \;

5.
find / -name "A*zzz*.???" -exec tar -zcvf '{}'.tar.gz '{}' \;
oppure
find / -regex ".*A.*zzz.*\...." -exec tar -zcvf '{}'.tar.gz '{}' \;

6.
find / -type d -name "bin" -exec ls '{}' \;

7.
find / -name "*.c" ! -user quer
oppure (ma solo nel caso i campi siano separati da spazi singoli e non multipli)
find / -name "*.c" -exec ls -la \{} \; | cut -d " " -f 3,10 | grep -v quer| cut -d " " -f 2

8.
find / -maxdepth 1 -user quer -exec chmod go-xrw '{}' \;