Re: which is the best command to use

[lina]

On Tuesday 27,December,2011 09:51 PM, Tony Baldwin wrote:
On Tue, Dec 27, 2011 at 09:11:45PM +0800, lina wrote:
On Tuesday 27,December,2011 08:57 PM, lina wrote:
Hi,
I have two questions, wish to get advice,

Question 1:

For a series of files:

cat  a_*.o* | grep "WARNING"

some file like a_1.o12 has WARNING, but others does not have WARNING

How can I let grep returns the filename?
I wrote a very-low-level and not-work-as-expected one,

#!/bin/sh

for filename in *.o*

do
#echo $filename
a= cat $filename | grep "WARNING"
         if [ a ]
         then
                 echo $filename
         fi

done

for filename in *.o*; do
if [ grep "WARNING" ];
        then echo $filename
fi
done

Thanks,
$ ./return_error_filename.sh
./return_error_filename.sh: line 6: [: grep: unary operator expected


$ cat return_error_filename.sh
#!/bin/sh

for filename in *.o*

do
    if [ grep "WARNING" ];
    then
        echo $filename
    fi

done

./tony



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