echo 'a\tb' "c\nd"
echo -n 'x\c'; echo y
echo -e 'a\nb'
echo -n -n a; echo
echo -- -n
echo '\0101\101\1\08' | od -An -c
echo 'a\cb' c; echo next
echo '\x41 \e \E A \q' | od -An -c
x='a\tb\\'; echo $x "$x"
echo 'end\' '\\' '\'
printf '%s\n' 'echo "a\\tb"' > e.sh; . ./e.sh
f() { echo "$@"; }; f -n 'q\tr'; echo
