# find files with setuid and setgid flag
find / -type f -a \( -perm -4000 -o -perm -2000 \) -print

# search all html files and replace them with one string to another.
find . -name '*.html' -exec perl -i -pe 's!string to change!what to change it to!g' {} \;

# look for SYN_RECEIVED for possible DOS attacks
netstat -a -f inet

# non-interactive way to send email at shell with attachment
cat "emailbody" | mutt -s "subject" -a "attachment.doc" -x email@address

# synchronize date/time with NTP automic time server
/usr/sbin/ntpdate time.nist.gov

For a shortcut to RESTART Windows XP:
SHUTDOWN -r -t 01

For a shortcut to SHUT DOWN Windows XP:
SHUTDOWN -s -t 01

validate XML against DTD
xmllint --noout --dtdvalid ./epupdate_hist.dtd epupdate_hist.xml


$ alias gdbbt="gdb -q -n -ex bt -batch"
Print stack trace of a core file without needing to enter gdb interactively


$ gdb -batch -ex "run" -ex "bt" ${my_program} 2>&1 | grep -v ^"No stack."$
Run a program transparently, but print a stack trace if it fails


$ gdb --batch --quiet -ex "thread apply all bt full" -ex "quit" ${exe} ${corefile}
Print stack trace of a core file without needing to enter gdb interactively

# code -> HTML
https://tohtml.com/

# web scrapper