some useful linux commands
# best way to see log file less +F /var/log/syslog (equals: less /var/log/syslog, then shift+f)
# see dmesg when it changes watch -n 0.1 "dmesg | tail -n 30"
# use xargs with find find . -type x | xargs -I{} --no-run-if-empty file {}
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