placement new syntax

valgrind can run a gdb server so that a gdb can interact with it. valgrind has 2 options to trigger that:

--vgdb=yes,
--vgdb-error=0.

This second option tells valgrind it needs to wait for that many errors before freezing and wait for a gdb to connect. Setting it to 0 will make valgrind to wait for gdb to connect before executing the program.

valgrind --vgdb=yes --vgdb-error=0 ./foo
gdb ./foo
(gdb) target remote | vgdb

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lsof -nPi tcp:80

sed '/test/{/error|critical|warning/d}' somefile

!:1-3

shopt -s autocd

nocache <I/O-heavy-command>

lsmod | perl -e 'print "digraph \"lsmod\" {";<>;while(<>){@=split/\s+/; print "\"$[0]\" -> \"$\"\n" for split/,/,$[3]}print "}"' | dot -Tpng | display -

strace -e write=1,2 -p $PID 2>&1 | sed -un "/^ |/p" | sed -ue "s/^.{9}(.{50}).+/\1/g" -e 's/ //g' | xxd -r -p

strings /dev/mem|less

command !(regexp to remove from matching)

Note: This is a feature of bash, and it only works if you've enabled 'extglob' (Extended Pattern Matching):
shopt -s extglob

ifconfig | convert label:@- ip.png

ctrl-x e

Next time you are using your shell, try typing ctrl-x e (that is holding control key press x and then e). The shell will take what you've written on the command line thus far and paste it into the editor specified by $EDITOR. Then you can edit at leisure using all the powerful macros and commands of vi, emacs, nano, or whatever.

disown -a && exit

arecord -f cd | ssh -C user@host aplay -f cd

or the other way around

ssh -C user@host arecord -f cd | aplay -f cd

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