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  • Can you move the >>$OUTPUT_FILE to the end of the loop, i.e. done >>$OUTPUT_FILE? Commented Mar 1, 2013 at 12:37
  • maybe you dont have permission on the dir to redirect the file. So you maybe running it as sudo. sudo touch will work. but sudo echo "string" >> log.txt wont work. Can you add the permission in that dir to the question and how you are running the script. Commented Mar 1, 2013 at 12:47
  • Ashwin, even a normal touch is working. Did not need a sudo Commented Mar 1, 2013 at 12:53
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    From your two recent questions, I'd bet your script has some carriage return characters as if coming from a system where line ending is with CRLF. Try dos2unix or d2u on the files to convert to Unix line ending. See the output of cat -vte on the file to confirm. Commented Mar 1, 2013 at 13:35
  • Stephane, my script does not use any input files. All the values required (IN_REGEX, OUT_REGEX and OUTPUT_FILE) are set in the script itself. There seems to be something that is preventing this script from writing to the filesystem. I have checked the permissions, the space availability and also if touch works. All three don't show any problem. Commented Mar 1, 2013 at 14:41