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Timestamp & date

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# 8  
Old 08-25-2008
Every group of parenthesis \(..\) marks a group of characters in the filenames (because the first '_' character in the filename "anchors" the regular expression). In each group are two characters, which because of how you named your files, will be a number representing a portion of the date. After the second / (the substitution side), the back-quoted numbers (ie, \1 \2 \3, etc) refer "back" to the 1st, 2nd, 3rd group, respectively.

Put more succinctly, on the LHS of the 2nd /, the 2nd group of parenthesis matches exactly two characters and is represented on the RHS as \2. After sed does its work, your filenames will look like:

2008-08-22 05:00:01_FILE.TXT
Last edited by otheus; 08-25-2008 at 10:16 AM.. Reason: typo: replaced "LFS" with "LHS"
# 9  
Old 08-25-2008
what he said ! Smilie
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