949 B
False friends
Bash and CLI-tools waiting to shoot you from behind
PATH
an empty string in $PATH
is equivalent to .
, so prepending :
to your PATH, effectively includes the CWD into the PATH, giving it priority over everything else in the PATH, which is incredibly dangerous.
killall -1
in killall
the parameter -1
is - differnently to kill
NOT interpreted as signal, but is a special variable for "applies to everything except PID1 and self". Therefore no signal is given, and the default one (15, SIGTERM) will be applied to each and every PID (but is then usually reduced again to the searchterm given). So killall -1 java
does in pseudocode effectively: where name is java; do [ ! PID == 1 ] && kill -s 15 $name; done
...very dangerous
grep -irl
you'd normally expect, that grep -irl
will find an expression to grep for at the desired location, but it does not, if symlinks are into play. Use grep -iRl
instead.