Sorry, for code-historical reasons this was unnecessarily complicated. Should be:
MY_DIR = '/my/path/to/dir'
FILES = os.listdir(MY_DIR)
def grep(regex):
output = []
for f in FILES:
command = "egrep " + '"' + regex + '" ' + MY_DIR + '/' + f
result = subprocess.getoutput(command)
if result:
output.append(result)
return output
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