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--- ls_usage [2021/01/15 21:48] – created raju
+++ ls_usage [2022/07/22 23:34] (current) – [indicators] raju
@@ Line 1: / Line 1: @@
-==== Show file date in YYYY-MM-DD format ====
+==== sort ls output by filename length ====
-tags | YYYYMMDD, date format, YYYYMMDD_HHMMSS
+<code>
+ls --color=never --indicator-style=none | awk '{print length, $0}' |
+sort -n | cut -d" " -f2-
+</code>
-Use --time-style='+%Y-%m-%d'
+To see it in action, create some files
 <code>
+% touch a ab abc
+</code>
+and some directories
+<code>
+% mkdir d de def
+</code>
+Output of the normal ls command
+<code>
+% ls
+a  ab  abc  d/  de/  def/
+</code>
+Output from the proposed command
+<code>
+% ls --color=never --indicator-style=none | awk '{print length, $0}' |
+sort -n | cut -d" " -f2-
+a
+d
+ab
+de
+abc
+def
+</code>
+Ref:- https://stackoverflow.com/a/70628169
+==== Show file date in different date formats ====
+tags | YYYY-MM-DD, YYYYMMDD, YYYYMMDD_HHMMSS
+Use one of
+<code>
+--time-style='+%Y%m%d_%H%M%S'
+--time-style='+%Y-%m-%d'
+--time-style='+%Y%m%d'
+</code>
+For example
+<code>
+% ls -l --time-style='+%Y%m%d_%H%M%S' ~/.vimrc
+-rwx------ 1 rajulocal rajulocal 1112 20201017_141554 /home/rajulocal/.vimrc*
 % ls -l --time-style='+%Y-%m-%d' ~/.vimrc
--rwx------ 1 rajulocal rajulocal 1087 2020-04-27 /home/rajulocal/.vimrc*
+-rwx------ 1 rajulocal rajulocal 1112 2020-10-17 /home/rajulocal/.vimrc*
-% ls -l ~/.vimrc
+% ls -l --time-style='+%Y%m%d' ~/.vimrc
--rwx------ 1 rajulocal rajulocal 1087 Apr 27 20:56 /home/rajulocal/.vimrc*
+-rwx------ 1 rajulocal rajulocal 1112 20201017 /home/rajulocal/.vimrc*
 </code>
+==== indicators ====
+"ls -F" appends indicators <nowiki>*/=>@|</nowiki> to filenames.
+  * * means executable.
+  * / means directory.
+  * = means socket.
+  * > means door.
+  * @ means symbolic link (or that the file has extended attributes).
+  * | means named pipe.
+Ref:- https://unix.stackexchange.com/questions/82357/what-do-the-symbols-displayed-by-ls-f-mean
+==== only show filename and modification time ====
+<code>
+ls -al | cut -d ' ' -f 6-
+</code>
+Another way (using find):
+<code>
+find -maxdepth 1 -type f -printf "%TY %Tb %Td %TH:%TM\t%p\n"
+</code>
+To sort the files based on timestamp (reverse chronological order)
+<code>
+find -maxdepth 1 -type f -printf "%T+#%TY %Tb %Td %TH:%TM\t%p\n" | sort -rn| cut -d# -f2-
+</code>
+The %T+ is used to sort the output properly and gets removed by cut afterwards.
+Ref:- https://askubuntu.com/a/1044206/574082