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Checking ksh script syntax

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# 1  
Old 12-15-2009
Checking ksh script syntax
To check a bash script syntax without executing it we use:
Code:
bash -n scriptname

What should be the equivalent command for checking a ksh script?
# 2  
Old 12-15-2009
Code:
ksh -n scriptname

# 3  
Old 12-15-2009
I have a script:

[CODE][root@wiki ~]# cat load_avg_alert.sh
#!/bin/ksh


UPTIME=`uptime|grep -o 'load.*'|sed 's/[,|:]//g'`

avg1min=`echo "$UPTIME"|grep -o "load average.*"|awk '{print $3}'`
avg5min=`echo "$UPTIME"|grep -o "load average.*"|awk '{print $4}'`
avg15min=`echo "$UPTIME"|grep -o "load average.*"|awk '{print $5}'`

When i run
Code:
 ksh load_avg_alert.sh

I get no error as output.

But when i run
Code:
ksh -n load_avg_alert.sh

i get the following error:
Code:
load_avg_alert.sh: warning: line 4: `...` obsolete, use $(...)
load_avg_alert.sh: warning: line 6: `...` obsolete, use $(...)
load_avg_alert.sh: warning: line 7: `...` obsolete, use $(...)
load_avg_alert.sh: warning: line 8: `...` obsolete, use $(...)
load_avg_alert.sh: warning: line 10: `...` obsolete, use $(...)
load_avg_alert.sh: warning: line 12: `...` obsolete, use $(...)

Why is that?
Last edited by proactiveaditya; 12-21-2009 at 07:16 AM..
# 4  
Old 12-15-2009
These are warnings not errors. They probably refer to obsolete syntax that still works but has been superceded. By the look of it you have code that use backticks when: -

Code:
$(...)

would be better.
# 5  
Old 12-15-2009
Ok got it
# 6  
Old 12-15-2009
It's justa that the backticks are a bit obsolete. It's better tu use $(...). 2 good reasons:
1. The command substitutions can be nested.
2. The script is more readable.
But it's not an error !
# 7  
Old 12-15-2009
Command substitution can also be nested using backtick.
Last edited by proactiveaditya; 12-21-2009 at 01:47 PM..
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