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.
These 2 Users Gave Thanks to Scrutinizer For This Post:
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I am on a HP-UX machine I have a directory called "/u01/blobs" and the files look like this:
ls -1
7398
7399
7400
I need to produce a comma delimited file with the following format:
filename,location/filename
i.e:
7398,/u01/blobs/7398
7399,/u01/blobs/7399
7400,/u01/blobs/7400
What... (3 Replies)
Discussion started by: NomDeGuerre
3 Replies
2. Shell Programming and Scripting
Hello guys, thank God that I found this forum.
I hope that someone can help me because I don't have any idea on how to start it. I know that for some of you this is a very simple task but I'm not as advance on shell scripting like many people out there.
I got this file with a permanent... (10 Replies)
Discussion started by: Shark Tek
10 Replies
3. Shell Programming and Scripting
Hello all.
I am new to this forum (and somewhat new to UNIX / LINUX - I started using ubuntu 1 year ago).:b:
I have the following problem that I have not been able to figure out how to take care of and I was wondering if anyone could help me out.:confused:
I have all of my music stored in... (7 Replies)
Discussion started by: marcozd
7 Replies
4. UNIX for Dummies Questions & Answers
Hi guys, I am a newbie here :wall:
I need a script that can search for a file in a directory and copy the contents of that file in a new file.
Please help me. :confused: Thanks in advance~ (6 Replies)
Discussion started by: zel2zel
6 Replies
5. Shell Programming and Scripting
I hope some one can help me
I have multiple files in a directory with out extension like as below mentioned. But i want to change all the file names along .DDMMYYYYHHMISS format. And all files should have same DDMMYYYYHHMISS.
Scenario:
direcory name = /vol/best/srcfiles
files in a... (4 Replies)
Discussion started by: hari001
4 Replies
6. Shell Programming and Scripting
I have to write a script to rename the every last sub-directory in a directory structure if the last sub-directory name doesn't contain "submitted".
eg:
given directory path:/u01/home/somedir
somedir can have many subdirectories and each subdirectory inturn has many subdirectories.
somedir... (3 Replies)
Discussion started by: ramse8pc
3 Replies
7. Shell Programming and Scripting
Hello All,
Can you help me in writing a script for reading the specific position data in a file and if that data found in that file that particular file should be renamed.
Ex: Folder : C:\\test
and Filename : CLSACK_112214.txt,CLSACK_112314.txt,CLSACK_112414.txt
Contents in the file would... (3 Replies)
Discussion started by: nanduedi
3 Replies
8. Shell Programming and Scripting
I am trying to use the two files shown below to either remove or rename contents in one of those files. If in file1.txt $5 matches $5 of file2.txt and the value in $1 of file1.txt is not "No Match" then that value is substituted for all values in $5 and $1 of file2.txt. If however in $1 ... (5 Replies)
Discussion started by: cmccabe
5 Replies
9. Shell Programming and Scripting
I have a specific set (all ending with .bam) of downloaded files in a directory /home/cmccabe/Desktop/NGS/API/2-15-2016. What I am trying to do is use a match to $2 in name to rename the downloaded files. To make things a more involved the date of the folder is unique and in the header of name... (1 Reply)
Discussion started by: cmccabe
1 Replies
10. UNIX for Beginners Questions & Answers
Hi All,
Just started learning unix and stuck into below issue.
Suppose i have folder structure as below.
Dir1/Dir2/Dir3/File1.msg
I am looking to rename the file name from File1.msg to File2.msg but from the parent Dir1
From Dir3 i can easily run the command like
mv File1.msg... (2 Replies)
Discussion started by: Gurjeet Singh
2 Replies
LEARN ABOUT OPENSOLARIS
chroot
chroot(2) System Calls chroot(2)
NAME
chroot, fchroot - change root directory
SYNOPSIS
#include <unistd.h>
int chroot(const char *path);
int fchroot(int fildes);
DESCRIPTION
The chroot() and fchroot() functions cause a directory to become the root directory, the starting point for path searches for path names
beginning with / (slash). The user's working directory is unaffected by the chroot() and fchroot() functions.
The path argument points to a path name naming a directory. The fildes argument to fchroot() is the open file descriptor of the directory
which is to become the root.
The privilege {PRIV_PROC_CHROOT} must be asserted in the effective set of the process to change the root directory. While it is always pos-
sible to change to the system root using the fchroot() function, it is not guaranteed to succeed in any other case, even if fildes is valid
in all respects.
The ".." entry in the root directory is interpreted to mean the root directory itself. Therefore, ".." cannot be used to access files out-
side the subtree rooted at the root directory. Instead, fchroot() can be used to reset the root to a directory that was opened before the
root directory was changed.
RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, -1 is returned, the root directory remains unchanged, and errno is set to indicate
the error.
ERRORS
The chroot() function will fail if:
EACCES Search permission is denied for a component of the path prefix of dirname, or search permission is denied for the directory
referred to by dirname.
EBADF The descriptor is not valid.
EFAULT The path argument points to an illegal address.
EINVAL The fchroot() function attempted to change to a directory the is not the system root and external circumstances do not
allow this.
EINTR A signal was caught during the execution of the chroot() function.
EIO An I/O error occurred while reading from or writing to the file system.
ELOOP Too many symbolic links were encountered in translating path.
ENAMETOOLONG The length of the path argument exceeds PATH_MAX, or the length of a path component exceeds NAME_MAX while _POSIX_NO_TRUNC
is in effect.
ENOENT The named directory does not exist or is a null pathname.
ENOLINK The path argument points to a remote machine and the link to that machine is no longer active.
ENOTDIR Any component of the path name is not a directory.
EPERM The {PRIV_PROC_CHROOT} privilege is not asserted in the effective set of the calling process.
SEE ALSO
chroot(1M), chdir(2), privileges(5)
WARNINGS
The only use of fchroot() that is appropriate is to change back to the system root.
SunOS 5.11 20 Jan 2003 chroot(2)