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[13:57] <mbuf> #startclass
[13:57] <mbuf> Roll call
[13:58] <shiva> Shiva Saxena
[13:58] <jeet__> Amitrajit Bose
[13:58] <storymode7> Mayank Singhal
[13:58] <ann> Anu Kumari Gupta
[13:58] <inquiridortechie> Neeraj Kumar Arya
[13:58] <schubisu> Robin Schubert
[13:58] <bhavin192> Bhavin Gandhi
[13:58] <akshayg96> Akshay Gaikwad
[13:58] <gutsytechster> Prashant Sharma
[13:58] <sidntrivedi> Siddhant N Trivedi
[13:58] <nightwarriorxxx> Aman Verma
[13:59] <mbuf> Today, we are going to work with Dired mode
[13:59] <mbuf> Before, we learn to use, let us first create few test directories and files to play around
[13:59] <mbuf> Open Emacs using "emacs -Q", and enter a shell and type these commands
[13:59] <priyankasaggu119> Priyanka Saggu
[14:00] <mbuf> => mkdir /tmp/dired-demo/network -p
[14:00] <mbuf> => mkdir /tmp/dired-demo/kernel
[14:00] <mbuf> => date > /tmp/dired-demo/date.txt
[14:00] <mbuf> => locale > /tmp/dired-demo/locale.txt
[14:00] <mbuf> => cp /etc/resolv.conf /tmp/dired-demo/network/resolv.conf
[14:00] <mbuf> => ip addr > /tmp/dired-demo/network/ip.output
[14:00] <mbuf> => dmesg > /tmp/dired-demo/kernel/dmesg.log
[14:00] <mbuf> We are basically creating a /tmp/dired-demo directory, with two sub-directories
[14:01] <mbuf> We are then creating some test files at the top-level directory, and also in the sub-directory
[14:01] <mbuf> Hopefully, these commands should be available in your distribution
[14:01] <sandeepK> Sandeep Kumar Choudhary
[14:03] <mbuf> I will give some time for you to type these commands and create the directory structure
[14:03] <mbuf> Since, it is created in /tmp, you can safely remove it after the session, or in some distros, /tmp content is removed on reboot
[14:04] <mbuf> Dired-mode is used to operate on directories and files inside GNU Emacs
[14:04] <mbuf> You can enter into it using:
[14:04] <mbuf> => C-x d
[14:05] <mbuf> At the minibuffer, it will prompt with the message, "Dired (directory): ~/"
[14:05] <mbuf> Here you can enter "/tmp/dired-demo"
[14:05] <mbuf> You will now see the dired buffer with the name 'dired-demo'
[14:06] <mbuf> To quit dired, you can simple use:
[14:06] <mbuf> => q
[14:07] <mbuf> Once, you enter into the dired-demo directory in Dired mode, you should see the date.txt, kernel/, locale.txt and network/ listing
[14:07] <mbuf> Of course, this is already in sorted order
[14:07] <mbuf> And you also see the permissions, ownership, group, size, date and time
[14:07] <mbuf> Let us now look at some basic motion commands in dired mode
[14:08] <mbuf> You can move to the previous line using:
[14:08] <mbuf> => p
[14:08] <mbuf> You can move down to the next line using:
[14:08] <mbuf> => n
[14:08] <nightwarriorxxx> mbuf: after entering the commands into emacs ,What do we have to do ?
[14:09] <nightwarriorxxx> Actually its my first emacs sessions
[14:10] <mbuf> nightwarriorxxx, use "!" to ask question
[14:10] <nightwarriorxxx> !
[14:10] <mbuf> next
[14:10] <nightwarriorxxx> mbuf: after entering the commands into emacs ,What do we have to do ?  Actually its my first emacs sessions
[14:10] <mbuf> nightwarriorxxx, which commands did you enter?
[14:11] <mbuf> nightwarriorxxx, I suggest you go through the previous sessions first
[14:11] <mbuf> You can move to the previous directory line using:
[14:11] <mbuf> => <
[14:11] <mbuf> You can move down to the next directory line using:
[14:11] <mbuf> => >
[14:12] <nightwarriorxxx> mbuf: ok
[14:13] <mbuf> If you move the cursor to the "kernel" line, and hit enter, dired will now show the contents of the "kernel" directory
[14:13] <mbuf> You can move to the parent directory using:
[14:14] <mbuf> => ^
[14:14] <jeet__> !
[14:14] <mbuf> next
[14:14] <jeet__> mkdir command to be typed on the terminal right?
[14:15] <mbuf> jeet__, yes
[14:16] <mbuf> If you are in the kernel/ directory, and cursor is on the dmesg.log entry, you can view the file using:
[14:16] <mbuf> => v
[14:16] <mbuf> OR
[14:16] <mbuf> => f
[14:16] <mbuf> If you want to open the file in another window, you can use:
[14:16] <mbuf> => o
[14:18] <mbuf> Move to the top-level directory, /tmp/dired-demo. You can create a new directory using:
[14:18] <mbuf> => +
[14:18] <mbuf> You will get a prompt message, "Create directory /tmp/dired-demo", where you can type "disk", and this directory will be created
[14:20] <mbuf> Just as how you learn to mark and unmark buffers, you can similarly operate in the Dired buffer
[14:20] <mbuf> To mark a file or subdirectory for later commands, use:
[14:20] <mbuf> => m
[14:21] <mbuf> To unmark a file or all files of a subdirectory, use:
[14:21] <mbuf> => u
[14:22] <mbuf> Let's say, you have marked the "disk" directory, and you want to invert your mark selection. You can use:
[14:22] <mbuf> => t
[14:23] <mbuf> If you want to mark all directories, you can use:
[14:23] <mbuf> => * /
[14:24] <mbuf> If you try the above in the top-level directory, you will see that the disk, kernel and network directories are selected
[14:25] <mbuf> If you simply want to undo the previous change, you can use the same short-cut for undo operation, and GNU Emacs is smart enough to revert your previous operation
[14:25] <mbuf> => C-x u
[14:26] <mbuf> If you want to mark all files (and directories) in the current directory, use:
[14:26] <mbuf> => * s
[14:26] <mbuf> You can mark files matching a regular expression using:
[14:27] <mbuf> => * %
[14:27] <mbuf> At the minibuffer, you will get a prompt message "Mark files (regexp):", and you can input .txt
[14:27] <mbuf> So, both date.txt and locale.txt will get marked
[14:28] <mbuf> The above are different ways to mark and unmark files in the Dired buffer
[14:30] <mbuf> You can insert another subdirectory into the current Dired buffer using:
[14:30] <mbuf> => i
[14:30] <mbuf> For example, if your cursor is in the 'kernel' entry, and you press 'i', the directory contents of the 'kernel' directory are pasted into the Dired buffer
[14:31] <mbuf> If you want to remove the subdirectory listing, you can use:
[14:31] <mbuf> => C-u k
[14:33] <jeet__> !
[14:33] <mbuf> If you have marked 'date.txt', and if you want to remove it from the listing, you can use:
[14:33] <mbuf> => k
[14:34] <mbuf> This does not delete the file, it only does not show it in the listing
[14:34] <mbuf> You can re-read all directories using:
[14:34] <mbuf> => g
[14:34] <mbuf> next
[14:35] <jeet__> Any reasons why this happened: when I was running dmesg > /tmp/dired-demo/kernel/ ... the auto completion using tab was not working
[14:35] <jeet__> Whereas for other commands it did work
[14:36] <mbuf> jeet__, 1. Where did you run it? 2. For which part of the command did you expect auto-completion?
[14:36] <jeet__> 1) On Terminal
[14:36] <mbuf> jeet__, be specific
[14:36] <jeet__> 2) dmesg > /tmp/dire [now press tab] nothing shows up
[14:37] <jeet__> whereas for other commands it automatically completed the path
[14:37] <jeet__> Although on typing the entire thing it worked. But why the autocomplete failed. I tried twice. Just curious. <eom>
[14:37] <mbuf> jeet__, 3. which terminal 4. How did you open it?
[14:38] <jeet__> 3)the normal ubuntu terminal ; 4) Ctrl+Alt+T
[14:39] <mbuf> jeet__, there is nothing called "normal Ubuntu terminal". If you have created the /tmp/dired-demo directory, it will auto-complete.
[14:39] <mbuf> jeet__, check that later
[14:40] <jeet__> Yes. I will ask you after the session
[14:40] <jeet__> Sorry for interrupting
[14:40] <mbuf> If you have have inserted multiple directories in the Dired buffer, you can selectively, hide the sub-directory listing using:
[14:40] <mbuf> => $
[14:40] <mbuf> You can press it again to unhide
[14:41] <mbuf> Similarly, if you want to hide and unhide all subdirectories, you can use:
[14:41] <mbuf> => M-$
[14:42] <mbuf> Let us now look at some commands you can use on marked files and directories
[14:43] <mbuf> Mark date.txt, and if you want to copy the file, you can use:
[14:43] <mbuf> => C
[14:43] <mbuf> It will prompt in the minibuffer with the message, "Copy date.txt to: /tmp/dired-demo/", and you can enter date2.txt
[14:44] <mbuf> Let us say, you now want to rename this file, you can mark date2.txt and use:
[14:44] <mbuf> => R
[14:45] <mbuf> It will prompt in the minibuffer with the message, "Rename date2.txt to: /tmp/dired-demo/" and you can input "date-new.txt"
[14:47] <mbuf> You can change the mode of the file using:
[14:47] <mbuf> => M
[14:48] <mbuf> If you press 'M' on date-new.txt, it will prompt in the minibuffer with the message, "Change mode of date-new.txt to:"
[14:48] <mbuf> and you can give, say 755
[14:48] <mbuf> You will now see that the permissions are modified!
[14:50] <mbuf> You can convert the filename to upper-case using:
[14:50] <mbuf> => % u
[14:50] <mbuf> Emacs will prompt in the minibuffer with the message "Rename upcase date-new.txt' to 'DATE-NEW.txt' [Type yn!q or C-h]
[14:51] <mbuf> If you enter 'y', it will rename the file with all upper case
[14:51] <mbuf> Similarly, you can convert the filename to lower case using:
[14:51] <mbuf> => %l
[14:52] <mbuf> You can delete a file using:
[14:52] <mbuf> => D
[14:53] <mbuf> At the minibuffer, you will get the prompt message, "Delete DATE-NEW.TXT (yes or no)", and you can input 'yes'
[14:53] <mbuf> And the file will be deleted
[14:54] <mbuf> You can compress or uncompress a file using:
[14:54] <mbuf> => Z
[14:54] <mbuf> Try this on /tmp/dired-demo/kernel/dmesg.log
[14:56] <mbuf> If you want to search files for a regular expression, you can use:
[14:56] <mbuf> => A
[14:56] <mbuf> Try this on the /tmp/dired-demo/network/resolv.conf entry
[14:57] <mbuf> You will get a prompt message in the minibuffer with "Search marked files (regexp):", and you can input 'nameserver'
[14:57] <mbuf> Emacs will open a new *xref* buffer matching the 'nameserver' entris
[14:57] <mbuf> *entries
[14:58] <mbuf> You can also run a query replace with regexp on marked files using:
[14:58] <mbuf> => Q
[14:58] <mbuf> Let's say for the /tmp/dired-demo/network/ip.output file, you want to change all 'link' to 'llink'
[14:59] <mbuf> If you press 'Q' in the ip.output entry, in the minibuffer, you will get a prompt message, "Query replace regexp in marked files:"
[14:59] <mbuf> You can input 'link'
[15:00] <mbuf> And then it will prompt you again with the message "Query replace regexp in marked files link with:"
[15:00] <mbuf> You can now input 'llink'
[15:00] <mbuf> It will open the buffer, and will prompt with the message, "Query replacing link with llink: (? for help)
[15:00] <mbuf> You can press 'y' to keep replacing the entries
[15:01] <mbuf> You can run a shell command on a file using:
[15:01] <mbuf> => !
[15:02] <mbuf> Keep the cursor on /tmp/dired-demo/locale.txt and press '!'
[15:02] <mbuf> You will get a prompt message with "! on locale.txt:"
[15:02] <mbuf> You can input 'wc'
[15:02] <mbuf> It will produce the word count output in the minibuffer itself
[15:03] <mbuf> You can also run asynchronous shell command on file(s) using:
[15:03] <mbuf> => &
[15:04] <mbuf> Let's say we want to run the 'wc' command on /tmp/dired-demo/kernel/dmesg.log' asynchronously, you can use '&' on its entry
[15:04] <mbuf> You will get the prompt message "& on dmesg.log:", and you can input 'wc'
[15:05] <mbuf> Emacs will open a new *Async Shell Command* buffer with the output of wc
[15:05] <mbuf> You can mark file for deletion using:
[15:05] <mbuf> => d
[15:06] <mbuf> Go ahead and mark the locale.txt for deletion.
[15:06] <mbuf> To execute the deletions requested (flagged files), use:
[15:06] <mbuf> => x
[15:06] <mbuf> You will be prompted in the minibuffer with the message:
[15:06] <mbuf> "Delete locale.txt (yes or no)" and you can input 'yes'
[15:07] <mbuf> The file will be deleted and the Dired buffer will also be refreshed to show you the current state of the buffer
[15:08] <mbuf> Emacs will create backup files at times that end with ~. If you find them in a directory, and you want to mark them for deletion, you can use:
[15:08] <mbuf> => ~
[15:08] <mbuf> Similarly, Emacs may create auto-save files, that begin and end with '#'. You can again flag these files in a directory using:
[15:09] <mbuf> => #
[15:09] <mbuf> If you want to flag files for deletion based on a regular expression, you can use:
[15:09] <mbuf> => % d
[15:11] <mbuf> You can use regexp to copy marked files
[15:11] <mbuf> => % C
[15:11] <mbuf> If you use the above command in the top-level /tmp/dired-demo directory, you will get a prompt message:
[15:11] <mbuf> "Copy from (regexp):", and you can input '.txt'
[15:12] <mbuf> It will then prompt you with the message "Copy .txt to:", and you can input '.log'
[15:13] <mbuf> You will get the message "Copy [-p] 'date.txt' to 'date.log'? [Type yn!q or C-h]", and you can input 'y'
[15:14] <mbuf> So, the date.txt will now be copied to date.log
[15:15] <mbuf> Similarly, you can rename marked files by regexp using:
[15:15] <mbuf> => %R
[15:15] <mbuf> => % R
[15:16] <mbuf> You can search for dired file(s) that match a pattern using:
[15:16] <mbuf> => M-x find-name-dired
[15:17] <mbuf> You will get a prompt "Find-name (directory): /tmp/dired-demo/", and you can simply hit enter
[15:17] <mbuf> It will then ask "Find-name (filename wildcard):" and you can input '.txt'
[15:17] <mbuf> The results will be shown in a *Find* buffer
[15:18] <mbuf> You can also grep for text on dired file(s) with a pattern using:
[15:18] <mbuf> => M-x find-grep-dired
[15:19] <mbuf> If you use the above command at the top-level directory, it will prompt with the message in the minibuffer, "Find-grep (directory): /tmp/dired-demo/"
[15:19] <mbuf> You can simply hit enter, and it will again prompt with the message "Find-grop (grep regexp):", and you can input 'link'
[15:20] <mbuf> All the files that have 'link' in them will show up in the *Find* buffer
[15:21] <jeet__> !
[15:21] <mbuf> You can also customize the find output, if you like, using:
[15:21] <mbuf> => M-x find-dired
[15:21] <mbuf> next
[15:21] <jeet__> What are the differences between c and Z ?
[15:21] <mbuf> jeet__, which context?
[15:22] <jeet__> To Compress a file
[15:22] <mbuf> jeet__, 'Z' is used to compress or uncompress a file
[15:22] <jeet__> When I pressed small c accidentally it showed me Compress to: /..
[15:23] <mbuf> jeet__, from the help, c runs the command dired-do-compress-to - compress selected files and directories to an archive. Prompt for the archive file name.
[15:24] <mbuf> jeet__, I have already taught you "C-h k"
[15:24] <mbuf> jeet__, Z runs the command dired-do-compress
[15:24] <mbuf> You can get the dired help using:
[15:24] <mbuf> => h
[15:24] <jeet__> Thanks mbuf
[15:24] <mbuf> You can also get a short dired summary (in the minibuffer) using:
[15:25] <mbuf> => ?
[15:25] <mbuf> These are basic Dired mode commands that you can use on files and directories inside GNU Emacs
[15:25] <mbuf> Any questions?
[15:26] <mbuf> Roll call
[15:26] <shiva> Shiva Saxena
[15:26] <jeet__> Amitrajit Bose
[15:26] <priyankasaggu119> Priyanka Saggu
[15:26] <bhavin192> Bhavin Gandhi
[15:26] <ann> Anu Kumari Gupta
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