Time Stamp

AnkitDewang · 07-24-2014, 09:49 AM

Hello Everyone...
What is Timestamp, and how we use it please help and give some explanation about it...

Thanks in advance !!!

szboardstretcher · 07-24-2014, 09:51 AM

in what context?

AnkitDewang · 07-24-2014, 09:55 AM

In the context of administration for the unix admintrator...

szboardstretcher · 07-24-2014, 10:11 AM

Its ah,.. the creation, modification, or access time of a file or directory.

As seen here:

Code:

$ ls -alh
-rw-r--r--  1 root root  54K Jul 24 14:47 v0.3.1.zip
-rw-------  1 root root  699 Jul 24 15:08 .viminfo
-rw-r--r--  1 root root    0 Jul 24 15:08 you_should_google
-rw-r--r--  1 root root    0 Jul 24 15:08 this_question
                               ^^^^^^-- This is a timestamp

also:

Code:

  
$ stat you_should_google_this_question
  File: `you_should_google_this_question'
  Size: 0               Blocks: 0          IO Block: 4096   regular empty file
Device: fe00h/65024d    Inode: 524879      Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2014-07-24 15:09:47.849884531 +0000  << This 
Modify: 2014-07-24 15:09:47.849884531 +0000  << This
Change: 2014-07-24 15:09:47.849884531 +0000  << And this are timestamps.
 Birth: -

AnkitDewang · 07-24-2014, 10:14 AM

How I am able to find this ????
Do you please provide me the command as I am the beginner and don't have much knowledge regarding this..

szboardstretcher · 07-24-2014, 10:18 AM

ls -alh
stat some_file_name

AnkitDewang · 07-24-2014, 10:22 AM

When I am using this command I got an error message, i.e.

$ls -alh
ls: NOt a recognized flag: h
Usage: ls [-1ACFHLNRSabcdefgiklmnopqrstuxEUX] [File...]

Will you provide me some book or document or any other material which helps me to learn the basics and understand everything, if I want to work as Unix Admin..

Thank you in advance...

szboardstretcher · 07-24-2014, 10:26 AM

only type:

Code:

ls -al

Sorry, I add the 'h' on as a habit.

Certainly, here is the linux admin guide.

http://www.tldp.org/LDP/sag/html/index.html

AnkitDewang · 07-24-2014, 10:29 AM

This command also not works...

Thank you for your help and providing the link for the Linux Admin Guide...

chrism01 · 07-25-2014, 07:07 AM

1. Please tell us what Linux distro+version you have.

Code:

ls -l
ls -lh

should both work.

2. There's no such thing as creation time in *nix
http://docstore.mik.ua/orelly/perl4/cook/ch09_01.htm

In theory, ext4 now supports a 'birth time', but most tools don't, so its usually zero, if you can even access it.

rtmistler · 07-25-2014, 10:23 AM

Quote:

Originally Posted by AnkitDewang

This command also not works...

Thank you for your help and providing the link for the Linux Admin Guide...

I'd suggest you perform the following and report the results:

Code:

$ which ls

# When you get the outcome of the which command for ls, then give a long listing of ls, example:

$ which ls
/bin/ls
$ ls -l /bin/ls
-rwxr-xr-x 1 root root 104508 Mar 31 2012 /bin/ls

# Next get the version of ls which you have by typing "ls --version", sample output following:

$ ls --version
Copyright (C) 2011 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.
$ 

# All of this is to tell whether or not you're using actual ls or if ls is a symbolic link to something
# called busybox which emulates ls and may provide different features.

Following this, other things to offer to the forum would be the version of Linux you have, including both the kernel and distribution name. Some things to try to get this information are:

Code:

$ cat /etc/*-release

# This will output the information in that file to show your release information.
# Another command is 'lsb_release -a' which also can print out the release if that command is available.

$ lsb_release -a

# A final check would be to determine whether or not there is an alias for the ls command.
# If you type 'alias' you will see all aliases, therefore see if there is one assigned for ls.

The concerns here by me and others are that you don't seem to have a properly working ls command, either because there is an alias, because ls is very old, or because ls is run out of busybox.