[Tutor] Referencing a string

[kalike2003 at netscape.net]

Hi,
I am having problem in using os.system(cmd) function. The function does not return the correct result when a string variable is given in the pattern field. The code is like this.
cmd = "grep -c pattern " + 'filelist3' + " > " + 'grepdata'
os.system(cmd)
Instead of looking at the contents of variable pattern, it takes pattern as the string to search and searches in the file. The contents of the variable pattern is correctly shown when I do a print.
Instaed of variable, when I tried with a fixed pattern like "the", it works fine.
Please suggest me the correct method.

Thanks.

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