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Check whether the pattern is present or not?

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# 1  
Old 06-27-2007
Check whether the pattern is present or not?
I want to determine whether a specific pattern is present within a line or not

e.g.

The whole line is in a varaible called VALUE

VALUE="(ABC, DEF, NMF, ABC, CLF, PAR, FHG, AGQSAs, sada, sa, ABC)"

i want to set a flag to 1 if i find the presence of ABC in the above variable.

Please tell me how to do it in a Shell Script?

Thanks in advance
# 2  
Old 06-27-2007
Code:
VALUE="(ABC, DEF, NMF, ABC, CLF, PAR, FHG, AGQSAs, sada, sa, ABC)"
mFlag=`echo $VALUE | egrep -c 'ABC'`
echo "mFlag = "$mFlag

# 3  
Old 06-27-2007
Quote:
Originally Posted by skyineyes
I want to determine whether a specific pattern is present within a line or not

e.g.

The whole line is in a varaible called VALUE

VALUE="(ABC, DEF, NMF, ABC, CLF, PAR, FHG, AGQSAs, sada, sa, ABC)"

i want to set a flag to 1 if i find the presence of ABC in the above variable.

Please tell me how to do it in a Shell Script?

Thanks in advance
Code:
if [[ "$VALUE" = *ABC* ]] ; then
  flag=1
fi;

# 4  
Old 06-27-2007
Thanks alot

Just a modification to this.

If i want to test the presence of two patterns in one go then how this line should look like. Suppose i want to check the presence of both "ABC" and "PAR" and then set the value if EITHER ONE OF THEM OR BOTH EXIST

i.e LOGICAL OR CONDITION FOR PRESENCE OF BOTH.
# 5  
Old 06-27-2007
Code:
VALUE="(ABC, DEF, NMF, ABC, CLF, PAR, FHG, AGQSAs, sada, sa, ABC)"
mFlag=`echo $VALUE | egrep -c 'ABC|PAR'`
echo "mFlag = "$mFlag

# 6  
Old 06-27-2007
Thanks alot man.
I am really thankful

Quote:
Originally Posted by Shell_Life
Code:
VALUE="(ABC, DEF, NMF, ABC, CLF, PAR, FHG, AGQSAs, sada, sa, ABC)"
mFlag=`echo $VALUE | egrep -c 'ABC|PAR'`
echo "mFlag = "$mFlag

# 7  
Old 06-27-2007
If you test the presence of 'GQS' the egrep command will set the flag to 1, because the 'GQS' is found (inside 'AGQSAs').
If you want to test for the entire value, you must modify the egrep RE:

Code:
VALUE="(ABC, DEF, NMF, ABC, CLF, PAR, FHG, AGQSAs, sada, sa, ABC)"
mFlag=`echo $VALUE | egrep -c '[(, ](XXX|GQS)([),]|$)'`
echo "mFlag = "$mFlag

The result will be 0 since there is no element equal to GQS nor XXX inside VALUE
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