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Unknown test operator

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# 1  
Old 08-14-2013
Unknown test operator
O/S solaris 9
shell ksh

Code:
if [ ! `uptime | grep day` ]
then 
  chk_op[0]="WARNING...reboot within the last 24hrs, restarted at `who -r | awk '{print $4$5"@"$6}'`" ; 
else
   if [ `uptime | awk '{print$3}'` -ge 100 ] ; 
   then  
   last_reboot1=`who -b | awk '{print $4" "$5" "$6}'`
   last_reboot2='..OK..'`uptime | awk '{print$3" "$4}'`
   chk_op[0]="last rebooted on ${last_reboot1} ${last_reboot2}"
   fi
fi

The following is received when executing the code:
ksh: up: unknown test operator
# 2  
Old 08-14-2013
Try replacing if [ ! `uptime | grep day` ] with


Code:
if ! [ `uptime | grep -q day` ]

This User Gave Thanks to krishmaths For This Post:
squrcles
# 3  
Old 08-14-2013
And if possible, replace all back tics `` with parentheses $()
if ! [ $(uptime | grep -q day) ]
This User Gave Thanks to Jotne For This Post:
squrcles
# 4  
Old 08-14-2013
dumb question, but what's the difference between the back quotes and parentheses?
# 5  
Old 08-14-2013
The backticks have been deprecated in favor of $() for command substitution because $() can easily nest within itself as in $(echo foo$(echo bar)). There are also minor differences such as how backslashes are parsed in the backticks version.
Eks
echo "hello1-`echo hello2-\`echo hello3-\\\`echo hello4\\\`\``"
vs
echo "hello1-$(echo hello2-$(echo hello3-$(echo hello4)))"

Its also hard do see difference between ' and `
This User Gave Thanks to Jotne For This Post:
squrcles
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