Some indenting of your code would help the clarity of the process, however I think that the first if statement is a syntax error in bash. Would it be better to use this:-
Code:
acc_status_check=$(${ACC_HOME}/apmccctrl.sh status)
if [ "$acc_status_check" = "CA APM Command Center Agent Controller is running" ]
then
acc_status="1"
else
/opt/ca/APMCommandCenterController/apmccctrl.sh start
sleep 60
acc_status_check=$(${ACC_HOME}/apmccctrl.sh)
if [ "$acc_status_check" = "CA APM Command Center Agent Controller is not running." ]
then
acc_status="2"
fi
fi
echo $acc_status
The spaces between [, the variables, the operator and the ] in an if statement is important. You were basically say "Can I assign a value to acc_status_check ?" rather that "Is the value of acc_status_check matching the given string?" which I assume is what you really want
... ... ...
Thanks, in advance,
Robin
Hi Robin,
You are absolutely correct in noting that the if statement:
Code:
if acc_command="CA APM Command Center Agent Controller is running: PID:20583, Wrapper:STARTED, Java:STARTED"
does not test whether or not the expansion of the variable acc_command yields the string between the double-quotes, but it is not a bash syntax error. That if statement will execute the commands in the then clause if the assignment statement:
Code:
acc_command="CA APM Command Center Agent Controller is running: PID:20583, Wrapper:STARTED, Java:STARTED"
completes successfully (which it will better than 99.44% of the time) or will execute the commands in the else clause otherwise. In other words it tests whether or not the assignment statement completed successfully instead of comparing two strings and testing whether those two strings are identical.
It is unfortunate that this isn't a syntax error because it can give newbies the impression that it was doing what they wanted with printing any diagnostics. But, the shell command language grammar is very simple and allows the exit status of any command to be used as the condition in an if statement. The fact that a valid assignment statement sort of looks like an improperly written test command just points out how important spacing, punctuation, and the choice of operators are when writing shell scripts.
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