#!/bin/sh
FOO='hello world'
echo "$FOO"
cat "$0"

#!/bin/sh
trap '{ rm -f "/tmp/.script$$"; exit; }' EXIT INT TERM
tee "/tmp/.script$$" <<'#SCRIPT' | . /proc/self/fd/0
#!/bin/sh
FOO='hello world'
echo "$FOO"
cat "/tmp/.script$$"
#SCRIPT

#!/bin/sh
trap '{ rm -f "/tmp/.script$$"; exit; }' EXIT INT TERM
cat > "/tmp/.script$$" <<'#SCRIPT' && . "/tmp/.script$$"
#!/bin/sh
FOO='hello world'
echo "$FOO"
cat "/tmp/.script$$"
#SCRIPT

#!/bin/sh
trap '{ rm -f "/tmp/.script$$"; exit; }' EXIT INT TERM
. /proc/self/fd/0 <<EOF
$(tee "/tmp/.script$$" <<': "SCRIPT'
#!/bin/sh
FOO='hello world'
echo "$FOO"
cat "/tmp/.script$$"
: "SCRIPT
)
EOF
#"

#!/bin/sh
trap '{ rm -f "/tmp/.script$$"; exit; }' EXIT INT TERM
{ ( tee "/tmp/.script$$" >/proc/$$/fd/0 ) <<'#SCRIPT' & } && . /proc/self/fd/0
#!/bin/sh
FOO='hello world'
echo "$FOO"
cat "/tmp/.script$$"
#SCRIPT