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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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xfs_estimate(8) 					      System Manager's Manual						   xfs_estimate(8)

NAME
xfs_estimate - estimate the space that an XFS filesystem will take SYNOPSIS
xfs_estimate [ -h ] [ -b blocksize ] [ -i logsize ] [ -e logsize ] [ -v ] directory ... xfs_estimate -V DESCRIPTION
For each directory argument, xfs_estimate estimates the space that directory would take if it were copied to an XFS filesystem. xfs_esti- mate does not cross mount points. The following definitions are used: KB = *1024 MB = *1024*1024 GB = *1024*1024*1024 The xfs_estimate options are: -b blocksize Use blocksize instead of the default blocksize of 4096 bytes. The modifier k can be used after the number to indicate multiplica- tion by 1024. For example, xfs_estimate -b 64k / requests an estimate of the space required by the directory / on an XFS filesystem using a blocksize of 64K (65536) bytes. -v Display more information, formatted. -h Display usage message. -i, -e logsize Use logsize instead of the default log size of 1000 blocks. -i refers to an internal log, while -e refers to an external log. The modifiers k or m can be used after the number to indicate multiplication by 1024 or 1048576, respectively. For example, xfs_estimate -i 1m / requests an estimate of the space required by the directory / on an XFS filesystem using an internal log of 1 megabyte. -V Print the version number and exits. EXAMPLES
% xfs_estimate -e 10m /var/tmp /var/tmp will take about 4.2 megabytes with the external log using 2560 blocks or about 10.0 megabytes % xfs_estimate -v -e 10m /var/tmp directory bsize blocks megabytes logsize /var/tmp 4096 792 4.0MB 10485760 % xfs_estimate -v /var/tmp directory bsize blocks megabytes logsize /var/tmp 4096 3352 14.0MB 10485760 % xfs_estimate /var/tmp /var/tmp will take about 14.0 megabytes xfs_estimate(8)
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