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Top Forums UNIX for Beginners Questions & Answers Rename file in directory using contents within each file Post 303042538 by RudiC on Saturday 28th of December 2019 08:24:29 AM
Old 12-28-2019
Quote:
Originally Posted by Scrutinizer
Hi Ravinder,

As long as a mv operation is performed on the same file system -

.
.
.

Even if the file is moved between file systems, there should not be a problem as long as the file is kept open. Even though the file and it's contents ARE moved by the mv command, the OS keeps the file readable until it is closed and unlinked. See below, using nezabudka's one liner extended by mv's -v (--verbose) option

Code:
awk '/FORMAT/ {system("mv -vn "FILENAME " /tmp/" $10)}' f*
copied 'file1' -> '/tmp/NAME1_S1'
removed 'file1'
copied 'file2' -> '/tmp/11-1111-ID_S5'
removed 'file2'

and the respective lsof output (before and after (but before file closing) the mv operation) :
Code:
awk     2885 user    3r   REG   8,41      477    171 /mnt/9/file1
.
.
.
awk     2885 user    3r   REG   8,41      477    171 /mnt/9/file1 (deleted)

Even though attributed "deleted", the file's contents is still available and readable. Of course, once unlinked, the file can't be reopened / reused in its original location.
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efi_cp(1M)																efi_cp(1M)

NAME
efi_cp - copy to or from EFI file SYNOPSIS
devicefile] file1 file2 devicefile] file1 [file2]... dest-directory devicefile] file_or_dir1 [file_or_dir2]... dest-directory DESCRIPTION
copies files between HP-UX and EFI file systems. The EFI file system is based on the FAT file system and used by the Itanium-based system BIOS to locate an HP-UX bootloader. See efi(4). Without the option, copies from an HP-UX file system to the EFI volume specified by devicefile; in this case, the destination should be relative to the root of the EFI volume specified by devicefile. Use the option to copy from an EFI file system to an HP-UX file system; with the option, only a single regular file may be copied at a time. With two arguments: o If file2 does not exist, creates it and copies the contents of file1 into file2. o If file2 exists and is a regular file, deletes the the contents of file2 and copies the contents of file1 into file2. o If file2 exists and is a directory, creates a copy of file1 in that directory. With more than two arguments, the final argument must be an existing directory. If any of the other arguments is a directory, you must use the option, which specifies that the source directory and the subtree rooted there are to be copied to the destination directory. Options Options can be used singly or combined in any order before the file names. The space between option and argument is optional. devicefile is the device special file of the EFI file system to be copied. Without the option, uses the device file specified in the environment variable if it is defined. The option overrides the environment variable. Recursively copy the subtree rooted at each source directory to the destination directory. Copy file1 from an EFI volume to file2 in HP-UX file system. file1 should be relative to the root of the EFI volume specified by devicefile, not to an HP-UX file system. With the option, only a single regular file may be copied at a time. RETURN VALUE
returns exit code 0 if the copy is successful. Otherwise it prints a diagnostic message and returns nonzero. 0 Successful completion. >0 Error condition occurred. EXAMPLES
All the following examples copy to or from the EFI file system on device Copy into directory in the EFI file system on the specified device: Copy all files in current directory into directory in the EFI file system on the specified device Copy into directory in the EFI file system on the specified device and rename it Copy into the EFI boot directory of the EFI file system on the specified device: Copy into of the EFI file system on the device specified in the environment variable and rename it to Copy from the EFI file system on the specified device into the current HP-UX directory: Using a persistent device special file (dsf) copy from the EFI file system on the specified device into the current HP-UX directory (see intro(7)): AUTHOR
was developed by HP. SEE ALSO
efi_fsinit(1M), efi_ls(1M), efi_mkdir(1M), efi_rm(1M), efi_rmdir(1M), efi(4), intro(7). Itanium(R)-based Systems Only efi_cp(1M)
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