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Bash directory loop and order by creation date?

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# 1  
Old 11-30-2016
Bash directory loop and order by creation date?
Hello, how in bash i can get directory loop and order by creation date?

THX! Smilie

Code:
#!/bin/bash
for folder in /home/test/*
do
if [ -d "${folder}" ]; then
echo $folder;
fi

# 2  
Old 11-30-2016
If you have gnu ls
Code:
$ ls --version
ls (GNU coreutils) 8.21
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Richard M. Stallman and David MacKenzie.

then this:
Code:
ls --time=ctime -d */

so, --time=ctime to sort by creation time; -d to not list the contents of directories; */ expands to the list of directories in the current directory, forcing ls to only list directories.

Assuming --time=ctime works on your filesystem.

Andrew
This User Gave Thanks to apmcd47 For This Post:
ZerO13
# 3  
Old 11-30-2016
Hi.
Quote:
Originally Posted by apmcd47
...so, --time=ctime to sort by creation time ...
Quote:
ctime

ctime originally meant creation time,[12] however it has since been used almost always to refer to inode change time. It is updated any time file metadata stored in the inode changes, such as file permissions, file ownership, and creation and deletion of hard links. In some implementations, ctime is affected by renaming a file (both original Unix and modern Linux tend to do this).

Unlike atime and mtime, ctime cannot be set to an arbitrary value with utime(), as used by the touch utility, for example. Instead, when utime() is used, the ctime value is set to the current time.
Excerpt from stat (system call) - Wikipedia
Quote:
Change time and creation time (ctime)

Unix and Windows file systems interpret 'ctime' differently:

Unix systems maintain the historical interpretation of ctime as being the time when certain file metadata, not its contents, were last changed, such as the file's permissions or owner (e.g. 'This file's metadata was changed on 05/05/02 12:15pm').
Windows systems use ctime to mean 'creation time'[citation needed] (also called 'birth time') (e.g. 'This file was created on 05/05/02 12:15pm').

This difference in usage can lead to incorrect presentation of time metadata when a file created on a Windows system is accessed on a Unix system and vice versa.[citation needed] Most Unix file systems don't store the creation time, although some, such as HFS+, ZFS, and UFS2 do. NTFS stores both the creation time and the change time.

The semantics of creation times is the source of some controversy. One view is that creation times should refer to the actual content of a file: e.g. for a digital photo the creation time would note when the photo was taken or first stored on a computer. A different approach is for creation times to stand for when the file system object itself was created, e.g. when the photo file was last restored from a backup or moved from one disk to another.
Excerpt from: MAC times - Wikipedia

Best wishes ... cheers, drl
# 4  
Old 12-16-2016
Thats all great but how to implement it into this bash script??

Code:
#!/bin/bash 
for folder in /home/test/* 
do 
if [ -d "${folder}" ]; then 
echo $folder; 
fi

# 5  
Old 12-16-2016
How about, respecting the caveats by drl above:
Code:
ls -tcrd */ | while read DIRN; do echo "$DIRN"; done

This User Gave Thanks to RudiC For This Post:
ZerO13
# 6  
Old 12-16-2016
If you want to ignore everything you've been told and do not want to print directory names in order of date of creation and instead want to print directory names in order of increasing file status change times, you can use:
Code:
ls -1cd /home/test/*/

(note that the 1st option in the above command is the digit 1; not the lowercase letter l). Using the -1 option tells ls to produce names one per line without needing to feed the output through a while read echo loop.

If your directories are located on a filesystem type that does save creation times in addition to file status change times, on some systems you could get a list of directories in increasing order of creation times with:
Code:
ls -1Ud /home/test/*/

but since standard filesystems don't have a creation time (only a status change time as drl mentioned), the option letter to print the creation time (if there is one) may be different on your system. Search the ls man page on your system for an option containing the word creation to see if there is an option to sort output by creation time on your system, and if there is, what option character invokes it and what filesystem types have that information.
This User Gave Thanks to Don Cragun For This Post:
ZerO13
# 7  
Old 12-16-2016
i really need to implement it into the code, also it should sort it by make/create folder date, newest on top, not by updated folders

Code:
#!/bin/bash 
for folder in /home/test/* 
do 
if [ -d "${folder}" ]; then 
echo $folder; 
fi
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