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That actually works on Linux:

echo hello | tee /dev/fd/0
hello
hello
hello
...

echo hello | gawk '!length{exit(0)} {print; print substr($0,2) >"/dev/fd/3"; fflush()}' 3>/dev/fd/0
hello
ello
llo
lo
o

That takes advantage of the fact that on Linux all pipes are actually named pipes (i.e. they can be open via a path). Using a regular named pipe, it will work on other Unix systems, too -- see this answer on Stackoverflow.

That actually works on Linux:

echo hello | tee /dev/fd/0
hello
hello
hello
...

echo hello | gawk '!length{exit(0)} {print; print substr($0,2) >"/dev/fd/3"; fflush()}' 3>/dev/fd/0
hello
ello
llo
lo
o

That takes advantage of the fact that on Linux all pipes are actually named pipes (i.e. they can be opened via a path). Using a regular named pipe, it will work on other Unix systems, too -- see this answer on Stackoverflow.

That actually works on Linux:

echo hello | tee /dev/fd/0
hello
hello
hello
...

echo hello | gawk '!length{exit(0)} {print; print substr($0,2) >"/dev/fd/3"; fflush()}' 3>/dev/fd/0
hello
ello
llo
lo
o

That actually works on Linux:

echo hello | tee /dev/fd/0
hello
hello
hello
...

echo hello | gawk '!length{exit(0)} {print; print substr($0,2) >"/dev/fd/3"; fflush()}' 3>/dev/fd/0
hello
ello
llo
lo
o

That takes advantage of the fact that on Linux all pipes are actually named pipes (i.e. they can be open via a path). Using a regular named pipe, it will work on other Unix systems, too -- see this answer on Stackoverflow.

That actually works on Linux:

echo hello | tee /dev/fd/0
hello
hello
hello
...

echo hello | gawk '{if(length) print > "/dev/tty"; else exit(0); print substr($0,2);fflush()}' >/dev/fd/0
hello
ello
llo
lo
o

That actually works on Linux:

echo hello | tee /dev/fd/0
hello
hello
hello
...

echo hello | gawk '!length{exit(0)} {print; print substr($0,2) >"/dev/fd/3"; fflush()}' 3>/dev/fd/0
hello
ello
llo
lo
o