Why ls -lrth and ls -ltch gives different results

up vote
1
down vote

favorite

I was trying to find the time of database backup. Normally i use

ls -ltch

But this time i used

ls -lrth

It gave me different result for One file and all date-stamps were same for both commands

-rw-r----- 1 oracle dba 41M Dec 7 23:59 ctrl_071223
-rw-r----- 1 oracle dba 42M Dec 7 20:52 c-4249173797-20121207-00
-rw-r----- 1 oracle dba 202M Dec 7 20:52 ALG_OSLPRD_jens9rfr.alg
-rw-r----- 1 oracle dba 189M Dec 7 20:52 ALG_OSLPRD_jfns9rfr.alg
-rw-r----- 1 oracle dba 140M Dec 7 20:52 ALG_OSLPRD_jgns9rfr.alg
-rw-r----- 1 oracle dba 3.0G Dec 7 20:51 BKPOSLPRD_jbns9p1f.F_bkp
-rw-r----- 1 oracle dba 4.2G Dec 7 20:46 BKPOSLPRD_jdns9p1f.F_bkp
-rw-r----- 1 oracle dba 3.8G Dec 7 20:43 BKPOSLPRD_jcns9p1f.F_bkp
[root@pdbosl02 daily]# ls -lrth
total 12G
-rw-r----- 1 oracle dba 3.8G Dec 7 20:43 BKPOSLPRD_jcns9p1f.F_bkp
-rw-r----- 1 oracle dba 4.2G Dec 7 20:46 BKPOSLPRD_jdns9p1f.F_bkp
-rw-r----- 1 oracle dba 3.0G Dec 7 20:51 BKPOSLPRD_jbns9p1f.F_bkp
-rw-r----- 1 oracle dba 140M Dec 7 20:52 ALG_OSLPRD_jgns9rfr.alg
-rw-r----- 1 oracle dba 189M Dec 7 20:52 ALG_OSLPRD_jfns9rfr.alg
-rw-r----- 1 oracle dba 202M Dec 7 20:52 ALG_OSLPRD_jens9rfr.alg
-rw-r----- 1 oracle dba 42M Dec 7 20:52 c-4249173797-20121207-00
-rw-r----- 1 oracle dba 41M Dec 7 20:52 ctrl_071223

What I'm missing

edited Dec 8 '12 at 23:35

Gilles

512k12010151547

asked Dec 8 '12 at 14:19

OmiPenguin

1,485235784

add a commentÂ |Â

up vote
1
down vote

favorite

I was trying to find the time of database backup. Normally i use

ls -ltch

But this time i used

ls -lrth

It gave me different result for One file and all date-stamps were same for both commands

-rw-r----- 1 oracle dba 41M Dec 7 23:59 ctrl_071223
-rw-r----- 1 oracle dba 42M Dec 7 20:52 c-4249173797-20121207-00
-rw-r----- 1 oracle dba 202M Dec 7 20:52 ALG_OSLPRD_jens9rfr.alg
-rw-r----- 1 oracle dba 189M Dec 7 20:52 ALG_OSLPRD_jfns9rfr.alg
-rw-r----- 1 oracle dba 140M Dec 7 20:52 ALG_OSLPRD_jgns9rfr.alg
-rw-r----- 1 oracle dba 3.0G Dec 7 20:51 BKPOSLPRD_jbns9p1f.F_bkp
-rw-r----- 1 oracle dba 4.2G Dec 7 20:46 BKPOSLPRD_jdns9p1f.F_bkp
-rw-r----- 1 oracle dba 3.8G Dec 7 20:43 BKPOSLPRD_jcns9p1f.F_bkp
[root@pdbosl02 daily]# ls -lrth
total 12G
-rw-r----- 1 oracle dba 3.8G Dec 7 20:43 BKPOSLPRD_jcns9p1f.F_bkp
-rw-r----- 1 oracle dba 4.2G Dec 7 20:46 BKPOSLPRD_jdns9p1f.F_bkp
-rw-r----- 1 oracle dba 3.0G Dec 7 20:51 BKPOSLPRD_jbns9p1f.F_bkp
-rw-r----- 1 oracle dba 140M Dec 7 20:52 ALG_OSLPRD_jgns9rfr.alg
-rw-r----- 1 oracle dba 189M Dec 7 20:52 ALG_OSLPRD_jfns9rfr.alg
-rw-r----- 1 oracle dba 202M Dec 7 20:52 ALG_OSLPRD_jens9rfr.alg
-rw-r----- 1 oracle dba 42M Dec 7 20:52 c-4249173797-20121207-00
-rw-r----- 1 oracle dba 41M Dec 7 20:52 ctrl_071223

What I'm missing

edited Dec 8 '12 at 23:35

Gilles

512k12010151547

asked Dec 8 '12 at 14:19

OmiPenguin

1,485235784

add a commentÂ |Â

up vote
1
down vote

favorite

I was trying to find the time of database backup. Normally i use

ls -ltch

But this time i used

ls -lrth

It gave me different result for One file and all date-stamps were same for both commands

-rw-r----- 1 oracle dba 41M Dec 7 23:59 ctrl_071223
-rw-r----- 1 oracle dba 42M Dec 7 20:52 c-4249173797-20121207-00
-rw-r----- 1 oracle dba 202M Dec 7 20:52 ALG_OSLPRD_jens9rfr.alg
-rw-r----- 1 oracle dba 189M Dec 7 20:52 ALG_OSLPRD_jfns9rfr.alg
-rw-r----- 1 oracle dba 140M Dec 7 20:52 ALG_OSLPRD_jgns9rfr.alg
-rw-r----- 1 oracle dba 3.0G Dec 7 20:51 BKPOSLPRD_jbns9p1f.F_bkp
-rw-r----- 1 oracle dba 4.2G Dec 7 20:46 BKPOSLPRD_jdns9p1f.F_bkp
-rw-r----- 1 oracle dba 3.8G Dec 7 20:43 BKPOSLPRD_jcns9p1f.F_bkp
[root@pdbosl02 daily]# ls -lrth
total 12G
-rw-r----- 1 oracle dba 3.8G Dec 7 20:43 BKPOSLPRD_jcns9p1f.F_bkp
-rw-r----- 1 oracle dba 4.2G Dec 7 20:46 BKPOSLPRD_jdns9p1f.F_bkp
-rw-r----- 1 oracle dba 3.0G Dec 7 20:51 BKPOSLPRD_jbns9p1f.F_bkp
-rw-r----- 1 oracle dba 140M Dec 7 20:52 ALG_OSLPRD_jgns9rfr.alg
-rw-r----- 1 oracle dba 189M Dec 7 20:52 ALG_OSLPRD_jfns9rfr.alg
-rw-r----- 1 oracle dba 202M Dec 7 20:52 ALG_OSLPRD_jens9rfr.alg
-rw-r----- 1 oracle dba 42M Dec 7 20:52 c-4249173797-20121207-00
-rw-r----- 1 oracle dba 41M Dec 7 20:52 ctrl_071223

What I'm missing

edited Dec 8 '12 at 23:35

Gilles

512k12010151547

asked Dec 8 '12 at 14:19

OmiPenguin

1,485235784

I was trying to find the time of database backup. Normally i use

ls -ltch

But this time i used

ls -lrth

It gave me different result for One file and all date-stamps were same for both commands

-rw-r----- 1 oracle dba 41M Dec 7 23:59 ctrl_071223
-rw-r----- 1 oracle dba 42M Dec 7 20:52 c-4249173797-20121207-00
-rw-r----- 1 oracle dba 202M Dec 7 20:52 ALG_OSLPRD_jens9rfr.alg
-rw-r----- 1 oracle dba 189M Dec 7 20:52 ALG_OSLPRD_jfns9rfr.alg
-rw-r----- 1 oracle dba 140M Dec 7 20:52 ALG_OSLPRD_jgns9rfr.alg
-rw-r----- 1 oracle dba 3.0G Dec 7 20:51 BKPOSLPRD_jbns9p1f.F_bkp
-rw-r----- 1 oracle dba 4.2G Dec 7 20:46 BKPOSLPRD_jdns9p1f.F_bkp
-rw-r----- 1 oracle dba 3.8G Dec 7 20:43 BKPOSLPRD_jcns9p1f.F_bkp
[root@pdbosl02 daily]# ls -lrth
total 12G
-rw-r----- 1 oracle dba 3.8G Dec 7 20:43 BKPOSLPRD_jcns9p1f.F_bkp
-rw-r----- 1 oracle dba 4.2G Dec 7 20:46 BKPOSLPRD_jdns9p1f.F_bkp
-rw-r----- 1 oracle dba 3.0G Dec 7 20:51 BKPOSLPRD_jbns9p1f.F_bkp
-rw-r----- 1 oracle dba 140M Dec 7 20:52 ALG_OSLPRD_jgns9rfr.alg
-rw-r----- 1 oracle dba 189M Dec 7 20:52 ALG_OSLPRD_jfns9rfr.alg
-rw-r----- 1 oracle dba 202M Dec 7 20:52 ALG_OSLPRD_jens9rfr.alg
-rw-r----- 1 oracle dba 42M Dec 7 20:52 c-4249173797-20121207-00
-rw-r----- 1 oracle dba 41M Dec 7 20:52 ctrl_071223

What I'm missing

ls timestamps

edited Dec 8 '12 at 23:35

Gilles

512k12010151547

asked Dec 8 '12 at 14:19

OmiPenguin

1,485235784

edited Dec 8 '12 at 23:35

Gilles

512k12010151547

asked Dec 8 '12 at 14:19

OmiPenguin

1,485235784

edited Dec 8 '12 at 23:35

Gilles

512k12010151547

edited Dec 8 '12 at 23:35

Gilles

512k12010151547

edited Dec 8 '12 at 23:35

Gilles

512k12010151547

asked Dec 8 '12 at 14:19

OmiPenguin

1,485235784

asked Dec 8 '12 at 14:19

OmiPenguin

1,485235784

asked Dec 8 '12 at 14:19

OmiPenguin

1,485235784

add a commentÂ |Â

1 Answer
1

active

oldest

votes

up vote
3
down vote

accepted

The differences between both commands are:

the 2nd listing is sorted in reverse (-r)

the 2nd listing uses the modification time stamp as sort key (-t)

the 1st listing uses the ctime stamp as sort key (-tc)

On UNIX a file has 3 time stamps (atime, ctime, mtime) which are updated under different conditions.

To quote the wikipedia article on stat:

atime: time of last access (ls -lu),
mtime: time of last modification (ls -l), and
ctime: time of last status change (ls -lc).

An example for a status change is changing the permissions of a file.

edited Dec 8 '12 at 14:36

answered Dec 8 '12 at 14:25

maxschlepzig

32.4k31135205

Partially understood. But one thing is bothering me the timestamp of First line of First Listing and the Last Line of 2nd Listing is different and all other entries and same time in both listing. And I updated the Question Synchronized the commands based on Output. 2nd listing dont have the -tc flag
â€“Â OmiPenguin
Dec 8 '12 at 14:33

@UmairMustafa, updated the answer. Well, some event happened that triggered the ctime update. And that event only happened on ctrl_071223 (I gave an example of such an event in the answer and referenced the section in the Wikipedia article that discusses the semantics of the ctime stamp).
â€“Â maxschlepzig
Dec 8 '12 at 14:39

Ahh now i understand thanks dear for great explanation.
â€“Â OmiPenguin
Dec 8 '12 at 14:43

add a commentÂ |Â

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

up vote
3
down vote

accepted

The differences between both commands are:

the 2nd listing is sorted in reverse (-r)

the 2nd listing uses the modification time stamp as sort key (-t)

the 1st listing uses the ctime stamp as sort key (-tc)

On UNIX a file has 3 time stamps (atime, ctime, mtime) which are updated under different conditions.

To quote the wikipedia article on stat:

atime: time of last access (ls -lu),
mtime: time of last modification (ls -l), and
ctime: time of last status change (ls -lc).

An example for a status change is changing the permissions of a file.

edited Dec 8 '12 at 14:36

answered Dec 8 '12 at 14:25

maxschlepzig

32.4k31135205

Partially understood. But one thing is bothering me the timestamp of First line of First Listing and the Last Line of 2nd Listing is different and all other entries and same time in both listing. And I updated the Question Synchronized the commands based on Output. 2nd listing dont have the -tc flag
â€“Â OmiPenguin
Dec 8 '12 at 14:33

@UmairMustafa, updated the answer. Well, some event happened that triggered the ctime update. And that event only happened on ctrl_071223 (I gave an example of such an event in the answer and referenced the section in the Wikipedia article that discusses the semantics of the ctime stamp).
â€“Â maxschlepzig
Dec 8 '12 at 14:39

Ahh now i understand thanks dear for great explanation.
â€“Â OmiPenguin
Dec 8 '12 at 14:43

add a commentÂ |Â

up vote
3
down vote

accepted

The differences between both commands are:

the 2nd listing is sorted in reverse (-r)

the 2nd listing uses the modification time stamp as sort key (-t)

the 1st listing uses the ctime stamp as sort key (-tc)

On UNIX a file has 3 time stamps (atime, ctime, mtime) which are updated under different conditions.

To quote the wikipedia article on stat:

atime: time of last access (ls -lu),
mtime: time of last modification (ls -l), and
ctime: time of last status change (ls -lc).

An example for a status change is changing the permissions of a file.

edited Dec 8 '12 at 14:36

answered Dec 8 '12 at 14:25

maxschlepzig

32.4k31135205

Partially understood. But one thing is bothering me the timestamp of First line of First Listing and the Last Line of 2nd Listing is different and all other entries and same time in both listing. And I updated the Question Synchronized the commands based on Output. 2nd listing dont have the -tc flag
â€“Â OmiPenguin
Dec 8 '12 at 14:33

@UmairMustafa, updated the answer. Well, some event happened that triggered the ctime update. And that event only happened on ctrl_071223 (I gave an example of such an event in the answer and referenced the section in the Wikipedia article that discusses the semantics of the ctime stamp).
â€“Â maxschlepzig
Dec 8 '12 at 14:39

Ahh now i understand thanks dear for great explanation.
â€“Â OmiPenguin
Dec 8 '12 at 14:43

add a commentÂ |Â

up vote
3
down vote

accepted

The differences between both commands are:

the 2nd listing is sorted in reverse (-r)

the 2nd listing uses the modification time stamp as sort key (-t)

the 1st listing uses the ctime stamp as sort key (-tc)

On UNIX a file has 3 time stamps (atime, ctime, mtime) which are updated under different conditions.

To quote the wikipedia article on stat:

atime: time of last access (ls -lu),
mtime: time of last modification (ls -l), and
ctime: time of last status change (ls -lc).

An example for a status change is changing the permissions of a file.

edited Dec 8 '12 at 14:36

answered Dec 8 '12 at 14:25

maxschlepzig

32.4k31135205

The differences between both commands are:

the 2nd listing is sorted in reverse (-r)

the 2nd listing uses the modification time stamp as sort key (-t)

the 1st listing uses the ctime stamp as sort key (-tc)

On UNIX a file has 3 time stamps (atime, ctime, mtime) which are updated under different conditions.

To quote the wikipedia article on stat:

atime: time of last access (ls -lu),
mtime: time of last modification (ls -l), and
ctime: time of last status change (ls -lc).

An example for a status change is changing the permissions of a file.

edited Dec 8 '12 at 14:36

answered Dec 8 '12 at 14:25

maxschlepzig

32.4k31135205

edited Dec 8 '12 at 14:36

answered Dec 8 '12 at 14:25

maxschlepzig

32.4k31135205

answered Dec 8 '12 at 14:25

maxschlepzig

32.4k31135205

answered Dec 8 '12 at 14:25

maxschlepzig

32.4k31135205

Partially understood. But one thing is bothering me the timestamp of First line of First Listing and the Last Line of 2nd Listing is different and all other entries and same time in both listing. And I updated the Question Synchronized the commands based on Output. 2nd listing dont have the -tc flag
â€“Â OmiPenguin
Dec 8 '12 at 14:33

@UmairMustafa, updated the answer. Well, some event happened that triggered the ctime update. And that event only happened on ctrl_071223 (I gave an example of such an event in the answer and referenced the section in the Wikipedia article that discusses the semantics of the ctime stamp).
â€“Â maxschlepzig
Dec 8 '12 at 14:39

Ahh now i understand thanks dear for great explanation.
â€“Â OmiPenguin
Dec 8 '12 at 14:43

add a commentÂ |Â

Partially understood. But one thing is bothering me the timestamp of First line of First Listing and the Last Line of 2nd Listing is different and all other entries and same time in both listing. And I updated the Question Synchronized the commands based on Output. 2nd listing dont have the -tc flag
â€“Â OmiPenguin
Dec 8 '12 at 14:33

@UmairMustafa, updated the answer. Well, some event happened that triggered the ctime update. And that event only happened on ctrl_071223 (I gave an example of such an event in the answer and referenced the section in the Wikipedia article that discusses the semantics of the ctime stamp).
â€“Â maxschlepzig
Dec 8 '12 at 14:39

Ahh now i understand thanks dear for great explanation.
â€“Â OmiPenguin
Dec 8 '12 at 14:43

Partially understood. But one thing is bothering me the timestamp of First line of First Listing and the Last Line of 2nd Listing is different and all other entries and same time in both listing. And I updated the Question Synchronized the commands based on Output. 2nd listing dont have the -tc flag
â€“Â OmiPenguin
Dec 8 '12 at 14:33

@UmairMustafa, updated the answer. Well, some event happened that triggered the ctime update. And that event only happened on ctrl_071223 (I gave an example of such an event in the answer and referenced the section in the Wikipedia article that discusses the semantics of the ctime stamp).
â€“Â maxschlepzig
Dec 8 '12 at 14:39

Ahh now i understand thanks dear for great explanation.
â€“Â OmiPenguin
Dec 8 '12 at 14:43

add a commentÂ |Â

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