A similar question as been asked here
But it wont work for me
"shell.ksh" > >(tee here.log ) 2> >(tee err.log)
ksh: 0403-057 Syntax error: `>' is not expected.
this command will not redirect stderr just stdop
"shell.ksh" | tee file.log 2>&1
I am on AIX running some UNIX similar to BSD that does not have GNU extensions and this is ksh
ps $$
PID TTY STAT TIME COMMAND
40632390 pts/6 A 0:00 -ksh
Any short and sweet solns folks ?
Here is a wrapper script that should do what you want. I can't confirm that it works on AIX ksh, but it works using sh (AT&T Research) 93u+ 2012-08-01 (Debian's ksh package calls it the "Real, AT&T version of the Korn shell." This is intentionally neither pdksh nor its mksh fork).
This is portable and should work in all POSIX shells.
#!/bin/ksh
touch err.log here.log # create the logs now so tail -f doesn't complain
tail -f here.log & # follow the output we'll pipe to later (run in bg)
HERE=$! # save the process ID of this backgrounded process
tail -f err.log >&2 & # follow output (as above), pipe output to stderr
ERR=$! # save the process ID
"$@" > here.log 2> err.log # run given command and pipe stdout and stderr
RET=$? # save return value
sleep 1 # tail polls at 1/s, so wait one second
kill $HERE $ERR # stop following those logs
exit $RET # restore the exit code from given command
So you invoke it as pipe1+2.ksh shell.ksh (assuming both commands are in your path).
Here's a test version of shell.ksh:
#!/bin/ksh
echo this output is stdout 1
echo this output is stderr >&2
echo this output is stdout 2
and a trial run:
# ksh pipe1+2.ksh ksh shell.ksh
this output is stdout 1
this output is stdout 2
this output is stderr
# cat here.log
this output is stdout 1
this output is stdout 2
# cat err.log
this output is stderr
A note: because tail -f isn't instantaneous, stdout vs stderr will be slightly out of order. It won't even be consistent between runs, at least with code that runs as fast as echo.
I doubt your version of tail supports it, but GNU tail has a -s SECONDS flag that lets you specify a different polling interval as a decimal value, so you can try e.g. tail -f -s 0.01 … to improve the ordering of what is displayed. If your version of sleep also supports decimal values, change it to match that number.
(I had originally crafted a complicated file descriptor piping response based on one of the "more elaborate combinations" in the amazing Csh Programming Considered Harmful, but that didn't seem to work. See the comments and/or the initial version of this answer.)
