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Top Forums UNIX for Beginners Questions & Answers Rename file in directory using contents within each file Post 303042502 by Scrutinizer on Friday 27th of December 2019 07:44:32 AM
Old 12-27-2019
Hi Ravinder,

As long as a mv operation is performed on the same file system - as is the case here - that should not pose a problem, since mv then only manipulates directory data: A file name is nothing more than a directory entry, a pointer (a hard link) to the file itself.

When a process opens a file for reading, the operation system creates an entry (file descriptor) to represent that file and stores information about that opened file in memory. So then the directory entry is no longer used.

The mv operation is thus free to manipulate the directory entry.

So for the process that has opened and is reading the file, nothing changes as the directory data is being changed.
When it is done reading it just closes the file descriptor.

Also, the file list expanded by the glob is expanded before being passed to the awk script, so new file names are not passed to the script.

S.
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