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# 15  
Old 04-14-2011
guys I found the problem... it wanted spaces all around Smilie
thank you by the way for your support... I'll stay here Smilie

---------- Post updated at 04:54 PM ---------- Previous update was at 01:08 PM ----------

hello again experts!!!
ANOTHER new problem Smilie ... I have a for loop and I fill a file inside it. But out of this for I have one more for loop. I want every time that I am out of the nested for to clear the file beacause I want to fill it again with new data.inside the nested loop, I have this: >> file so that I can store data serial. If I clear the file the next time I want to run this nested loop, this command >> file will write at the begin ?? Show me please how can I clear the file every time but remaining the file empty..... I have a big problem...... Smilie

---------- Post updated at 05:04 PM ---------- Previous update was at 04:54 PM ----------

echo "" > file
would this be ok??
# 16  
Old 04-14-2011
Quote:
Originally Posted by mary_elen
ANOTHER new problem Smilie ... I have a for loop and I fill a file inside it. But out of this for I have one more for loop. I want every time that I am out of the nested for to clear the file beacause I want to fill it again with new data.inside the nested loop, I have this: >> file so that I can store data serial. If I clear the file the next time I want to run this nested loop, this command >> file will write at the begin ?? Show me please how can I clear the file every time but remaining the file empty..... I have a big problem...... Smilie

---------- Post updated at 05:04 PM ---------- Previous update was at 04:54 PM ----------

echo "" > file
would this be ok??
That will work, sort of. The "" is redundant. Just echo > file would serve the same function. The file won't be empty afterwards, just nearly so -- it'll contain one blank line.

To make the file completely empty without even a blank line in it, do : >file. : is a special built-in command that does nothing.

You could also simply delete the file. rm file
# 17  
Old 04-14-2011
omg!!! thank you sooooooooooo sooooo much!!!! the command : >file is perfect!!!!!! Smilie
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