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04-22-2009
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Why is a variable behaving differently in ksh script.
Guys i have strange behaviour with command output being saved in a variable instead of a tmp file. 1. I suck command output into a variable Sample command output Code:
# cleanstats DRIVE INFO: ---------- Drv Type Mount Time Frequency Last Cleaned Comment *** **** ********** ********* **************** ******* 0 hcart3* 51.9 0 N/A 1 hcart3* 55.9 0 N/A 2 dlt* 0.8 0 N/A 3 dlt* 0.0 0 N/A 4 dlt* 0.2 0 N/A 5 dlt* 0.0 0 N/A MEDIA INFO: ---------- media media robot robot robot side/ optical # mounts/ last ID type type # slot face partner cleanings mount time ------------------------------------------------------------------------------- CLN206 DLT_CL NONE - - - - 0 12/26/2001 08:22 CLN207 DLT_CL NONE - - - - 0 03/10/2002 10:00 CLN205 DLT_CL NONE - - - - 0 08/18/2002 06:40 CLN703 DLT_CL NONE - - - - 0 03/29/2003 05:11 CLN701 DLT_CL NONE - - - - 20 00/00/0000 00:00 CLN635 DLT_CL NONE - - - - 0 11/21/2003 04:32 CLN219 DLT_CL NONE - - - - 0 07/13/2004 06:25 CLN636 DLT_CL NONE - - - - 14 01/22/2006 08:15 CLN211 DLT_CL TLD 1 21 - - 12 10/31/2008 22:44 CLN209 DLT_CL NONE - - - - 0 12/13/2006 22:13 CLN210 DLT_CL NONE - - - - 0 10/19/2008 06:31 2. I then print that variable to screen for debug and its as expected 3. I then print that variable to an awk statement in an if test and it doesn't work as it should. 4. If the output is captured in a tempfile and the same awk statement is used but taking input from the tmpfile then it does work. The below code shows one way which doesn't work and one which does. Can anyone shed any light as to why? I'm obviously trying to use variables instead of tmpfiles everywhere. I can't understand it because the print statement for debug shows the output as expected. Code:
#!/bin/ksh
....script contents, variable assignment blah blah....
# Suck clean stats to variable
CSTAT=$(cleanstats)
# Or put in tmpfile
cleanstats > ${TMPFILE}
print "CSTAT contains [${CSTAT}]" #DBG
# Check tape exists in library with free cleanings
# If tape is in unit but with no cleanings OR
# If tape is NOT in unit (TLD), the string returned is empty thus matching -z test
# (section 1)
if [[ -z "$( print ${CSTAT} | nawk '$3 == "TLD" && $8 != "0" {print}' )" ]];then
.... do stuff ....
fi
# Above doesnt work, but below does
# (section 2)
#if [[ -z "$( nawk '$3 == "TLD" && $8 != "0" {print}' < ${TMPFILE} )" ]];then
# .... do stuff ...
#fi
Using the sample output above will cause the first section to match when it shouldn't, yet the second section works and just passes by the if. Anyone shed any light on it? IFS is set as newline as standard. Cheers Last edited by lavascript; 04-22-2009 at 10:23 AM.. |
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