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Full Discussion: Bash statement equivalent
Top Forums UNIX for Dummies Questions & Answers Bash statement equivalent Post 302921363 by Corona688 on Thursday 16th of October 2014 03:04:56 PM
Old 10-16-2014
You can trade off one less fifo for one more subshell:

Code:
#!/bin/ksh

log=ksh.log

rm -f $log /tmp/$$-e /tmp/$$-o
mkfifo /tmp/$$-o /tmp/$$-e || exit 1

(       (       cat < /tmp/$$-o & # will wait for exec >
                cat < /tmp/$$-e & # will wait for exec 2>
                wait        ) | tee $log ) >/dev/tty &

exec > /tmp/$$-o        # First cat will start running
exec 2>/tmp/$$-e        # Second cat will start running
rm -f /tmp/$$-o /tmp/$$-e # Both ends guaranteed open now, so delete as early as possible

echo "stdout stuff"
echo "stderr stuff">&2


Last edited by Corona688; 10-16-2014 at 04:16 PM..
 

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rmvb(9F)						   Kernel Functions for Drivers 						  rmvb(9F)

NAME
rmvb - remove a message block from a message SYNOPSIS
#include <sys/stream.h> mblk_t *rmvb(mblk_t *mp, mblk_t *bp); INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI). PARAMETERS
mp Message from which a block is to be removed. mblk_t is an instance of the msgb(9S) structure. bp Message block to be removed. DESCRIPTION
rmvb() removes a message block (bp) from a message (mp), and returns a pointer to the altered message. The message block is not freed, merely removed from the message. It is the module or driver's responsibility to free the message block. RETURN VALUES
If successful, a pointer to the message (minus the removed block) is returned. The pointer is NULL if bp was the only block of the message before rmvb() was called. If the designated message block (bp) does not exist, -1 is returned. CONTEXT
rmvb() can be called from user or interrupt context. EXAMPLES
This routine removes all zero-length M_DATA message blocks from the given message. For each message block in the message, save the next message block (line 10). If the current message block is of type M_DATA and has no data in its buffer (line 11), then remove it from the message (line 12) and free it (line 13). In either case, continue with the next message block in the message (line 16). 1 void 2 xxclean(mp) 3 mblk_t *mp; 4 { 5 mblk_t *tmp; 6 mblk_t *nmp; 7 8 tmp = mp; 9 while (tmp) { 10 nmp = tmp->b_cont; 11 if ((tmp->b_datap->db_type == M_DATA) && (tmp->b_rptr == tmp->b_wptr)) { 12 (void) rmvb(mp, tmp); 13 freeb(tmp); 14 } 15 tmp = nmp; 16 } 17 } SEE ALSO
freeb(9F), msgb(9S) Writing Device Drivers STREAMS Programming Guide SunOS 5.10 11 Apr 1991 rmvb(9F)
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