Linux Commands I Hardly Knew - Reloaded

Sunday, July 6, 2008

Linux Commands I Hardly Knew - Reloaded

I had posted Linux Commands I Hardly Knew a couple of days before.

I admit, it was a copy from Foogazi. I did mention the source. I just made it more readable and included the comments also into the post. I don't need any credit. The post got 25,000+ hits. It clearly means it was useful, that's enough.

The post got lots of comments across the web. I have compiled the comments and is posting it as Linux Commands I Hardly Knew - Reloaded.

Also, lots of people pointed out that most of the commands mentioned were not Linux commands, but specific to the shell. Still, I am keeping the name unchanged.

So, here you go...

Command History

CTRL+R and CTRL+S will search through the previous commands, backwards and forwards respectively.

In zsh, you can tab-complete history expansion, so you just use !s[tab] to see what you're running. bash doesn't have that, but you can do echo !s and, if you like what it says, !s (or !*, which pulls everything from the previous command line except the echo).

^find[^replace[^append]]

It looks for the first occurance of [find] in the last command and substitutes it with [replace] and appends the [append]. Anything you don't specify defaults to empty.

Example:
~% touch CapitalizedFilename
~% mv zCapitalizedFilename lowercase
mv: cannot stat `zCapitalizedFilename': No such file or directory
zsh: exit 1 mv zCapitalizedFilename lowercase
~% ^z
mv CapitalizedFilename lowercase
~% mz lowercase
zsh: command not found: mz
zsh: exit 127 mz lowercase
~% ^z^v^ lower_case
mv lowercase lower_case

Be sure to take a look at your shell's man-page for history expansion, there's a lot of useful stuff in there. You can expand particular commands, so !-3 expands to the third-most-recent command. You can often modify the expansion with ':'-modifiers. :s does a regex replacement, :2-4 selects the second through fourth words, :1* selects all but the first word, :Q de-quotes a word, etc.

pgrep Again

pgrep is same as
ps -A | grep firefox | awk '{ print $1}'
OR
ps -A | awk '/firefox/ { print $1} '

Grep to Kill?

kill `ps -A | grep firefox | awk '{ print $1}'`

OR

pkill firefox

pkill is to kill what pgrep is to grep.

OR

killall -9 firefox

killall doesn't have the same behavior across all Unix/Linux/BSD variants.

OR

pgrep firefox | xargs kill -9

Background Processes

You can put a process in the background after you've started it with CTRL-Z followed by bg. Also check out fg, bg, jobs.

A way to background a process and redirect the output after it's started...

If you've got screen running before you started the process, you can hit CTRL-A followed by D to detach. It will keep running in the background, keeping output to itself, even if you log out. To reattach, type screen -r. (Haven't checked this!!!)

Signatures

cowsay and figlet are interesting commands for generating signatures.

CTRL+L for Clearscreen

It is a feature of readline, which is used by bash and many other shells and other cli-based programs. You can customize key bindings in your ~/.inputrc file. Google it. That screen clearing readline command is clear-screen.

More Interesting Commands

http://www.shell-fu.org/lister.php?top

See also... » 10.1 Linux Commands I Can't Live Without

» Effective Use of VIM - Part 2

» Effective Use of VIM - Part 1

» Placing Adsense in Blogger Post

» Unlock a PC on Windiows XP ???

» A Hole through the Centre of the Earth


ATOzTOA : Latest Headlines


Posted by atoztoa at 2:02 PM email Edit

Labels: , , , , , ,

127 comments:

PaulRay said...

Thanks so much!
I've been a Linux (ubuntu) user for over a year and some of these were new to me.
I appreciate your effort to educate us.

July 6, 2008 at 4:22 PM d
Keith Pickett said...

I want to interject something about CTRL-S from the command line. In most, if not all terminals, CTRL-S will stop (or pause) activity in a terminal. Bring up a terminal (xterm). Type something like "ls -al" and then CTRL-S immediately. If it's a directory that doesn't contain a lot of files it will list files quickly in long format. If it has a lot of files, you will notice the scrolling stop when you enter CTRL-N. If you try to type anything else, nothing happens. The way to get around this is to enter CTRL-Q.
I guess i'm a little confused about your post above regarding the use of CTRL-S. Maybe I missed something obvious.
Anyway, if your terminal locks up for no reason, at least try CTRL-Q to undo it. This, by the way, goes back to the early days of terminals when programmers had to use this to pause directory listings and data output being echoed. We didn't have the use of scrollbars. ;-)
Hope this helps someone.

December 18, 2008 at 10:00 PM d
Keith Pickett said...

Sorry, I have to share some other helpful command line search examples. If your shell is bash (or ksh), you can set the command line mode to either vi or emacs. I prefer vi. To set it, just type:
# set -o vi

You can add this to your .bashrc or .profile (for ksh).

At the command line, you can search for previously used commands just like you can search for terms in vim. For example, if you have run several php scripts from the command line, then search for each of them using the following command(s):
Note:
ESC = tap the Escape key
ENTER = Enter key

#ESC /p ENTER

You will now see a command with the letter "p" in it. As in Vim, use the "j" and "k" keys to scroll up and down the list. Now, searching for only one letter (like we did with just "p") could yield a lot of files. If you instead enter:
ESC /php ENTER

(Note: Wildcards like * and ? are accepted)

That will yield results closer to what you are searching for. Again, use "j" and "k" to cycle the list. Once you found the command you want to re-run, just hit ENTER to execute it.

Or... while scrolling the list,just enter search slash ( "/" ) to search for a new term.
For example, you have entered ESC /php and are scrolling the list, but decide to search for the term "perl" instead. All you have to do is enter /perl ENTER and it will list all the previous commands with the term "perl" in it.

To just cycle through your most recent commands,
just do the following:

#ESC k
You may have to tap "k" a second time. You will see your most recent commands cycling through. To scroll back down the list, tap "j".

Not to confuse you further, you can go back and re-use the previous search term by just entering:
# ESC / ENTER
You should see your most recent search results scrolling.


Hope this helps.

December 18, 2008 at 10:25 PM d
Keith Pickett said...

In my previous post above, the "#" sign is the command prompt and should not be typed in. Sorry for any confusion.

December 18, 2008 at 10:28 PM d
Angelina William said...

very nice and Informative, preparing for linux Certification, wanted to learn some linux Commands,recently joined in http://www.kerneltraining.com/linux-admin-training/, can anyone suggest me some books and videos.

February 15, 2017 at 3:12 PM d
Kuldeep said...
This comment has been removed by the author.
March 1, 2017 at 4:42 PM d
March 16, 2017 at 12:09 PM d
March 22, 2017 at 11:18 AM d
March 31, 2017 at 6:32 PM d
March 31, 2017 at 6:32 PM d
March 31, 2017 at 6:34 PM d
March 31, 2017 at 6:36 PM d
March 31, 2017 at 6:36 PM d
March 31, 2017 at 6:36 PM d
March 31, 2017 at 6:38 PM d
April 8, 2017 at 1:07 PM d
April 11, 2017 at 1:03 PM d
April 11, 2017 at 1:09 PM d
April 16, 2017 at 1:40 PM d
Manisha Jain said...

It will be available here Rajasthan Board Result

If you need RBSE Board Result wait for May month


It will be available here Rajasthan Board 10th Result

It will be available here Rajasthan Board 12th Result

It will be available here RBSE 10th Result

It will be available here RBSE 12th Result




I want to know about HSSC Clerk Result Date. Will board cancel HSSC Result exam or not???

We hope you like Haryana Clerk Result Information given here. We will update it soon.

Board has released HSSC Patwari Result Information given here. Document verification date 27 April 2017

We hope you like Delhi Police Admit Card Information given here. We will update it soon.

April 17, 2017 at 6:42 AM d
April 28, 2017 at 6:08 PM d
May 1, 2017 at 11:26 AM d
May 1, 2017 at 11:27 AM d
May 1, 2017 at 11:28 AM d
May 1, 2017 at 11:28 AM d
May 1, 2017 at 11:29 AM d
May 2, 2017 at 3:52 PM d
May 2, 2017 at 3:54 PM d
Pradeep Saini said...
This comment has been removed by the author.
May 7, 2017 at 11:03 PM d
May 7, 2017 at 11:05 PM d
May 7, 2017 at 11:05 PM d
May 7, 2017 at 11:05 PM d
May 7, 2017 at 11:06 PM d
May 9, 2017 at 11:47 AM d
May 9, 2017 at 11:48 AM d
May 9, 2017 at 11:48 AM d
May 9, 2017 at 11:49 AM d
May 9, 2017 at 11:49 AM d
May 9, 2017 at 11:49 AM d
May 9, 2017 at 11:50 AM d
May 9, 2017 at 11:51 AM d
May 9, 2017 at 11:51 AM d
May 9, 2017 at 11:52 AM d
May 9, 2017 at 11:52 AM d
May 16, 2017 at 12:01 AM d
May 17, 2017 at 12:01 PM d
May 20, 2017 at 5:12 PM d
Nodia & Publication said...

Great information, preparing for a Linux education, Good to see this GATE Online Test Series (for EC, EE, ME branches only)
Thanks for sharing

May 26, 2017 at 1:29 PM d
June 4, 2017 at 11:07 AM d
June 4, 2017 at 11:07 AM d
June 24, 2017 at 12:23 PM d
July 8, 2017 at 2:36 PM d
GAURAV GUPTA said...

MP Vyapam Sub Engineer Result 2017 is going to declare soon at main webportal . candidate can check result online mode only . The exam was conducted in the month of July .

July 15, 2017 at 11:21 AM d
July 21, 2017 at 6:27 PM d
August 16, 2017 at 5:28 PM d
August 23, 2017 at 12:53 AM d
August 23, 2017 at 12:53 AM d
John Fernando said...

Easy to access the old result of Lottery for Nagaland : Nagaland Lotteries old result by just clicking on this link

The old lottery result of the Sambad are as follows : Lottery Sambad old result

We will get the old lottery result of Mizoram on our finger tip :Mizoram Lotteries old result through clicking this link

Nice to get the old lottery result of Sikkim : Sikkim Lotteries old result on this click

August 30, 2017 at 5:29 AM d
John Fernando said...

We will get the old lottery result of Sambad on our finger tip :Lottery Sambad old result through clicking this link

Nice to get the old lottery result of Nagaland: Nagaland Lotteries old result on this click

Easy to access the old result of Lottery for Sikkim: Sikkim Lotteries old result by just clicking on this link

The old lottery result of the Mizoram are as follows : Mizoram Lotteries old result

September 5, 2017 at 5:53 AM d
John Fernando said...

It is very good information that we will get details : Bigg Boss 11 on one single click

Seems to nice to watch the show :Watch Bigg Boss 11 on our finger touch

We will get details of contestant of the Big Boss show :Bigg Boss 11 Contestants on single shot

Nice to hear the details such as Voot Bigg Boss 11 of the show.

The complete details of audition of this show :Bigg Boss 11 Audition will give complete information

September 8, 2017 at 5:45 AM d
John Fernando said...

Please go thru the link :SSLC Result 2018 for complete SSLC results 2018

For your results of Kerala SSLC results 2018, please follow :Kerala SSLC Result 2018 get details on one click

You will get the details of Karnata SSLC results on :Karnataka SSLC Result 2018 Will get nice informstion

For the infotrmation regarding the Tamil Nadu SSLC results :Tamilnadu SSLC Result 2018 This will be helpful

September 24, 2017 at 5:44 AM d
September 25, 2017 at 5:21 PM d
John Fernando said...

Please go thru the link :PUC Result for complete Karnataka PUC Results

For your results of second PUC results, please follow : 2nd PUC Result get details on one click

For the infotrmation regarding the second PUC results 2018 :2nd PUC Result 2018 This will be helpful

September 30, 2017 at 5:39 AM d
John Fernando said...

Please go thru the link PUC Result 2018 for complete Karnataka PUC Results

For the infotrmation regarding the second PUC results 2018 :2nd PUC Result This will be helpful

For your results of second PUC results, please follow : PUC Result 2018 get details on one click

October 2, 2017 at 7:25 PM d
October 4, 2017 at 1:09 PM d
October 11, 2017 at 12:07 PM d
www.recruitmentinboxx.com said...

this post have very nice article. Keet going and thank you for the same.
http://www.recruitmentinboxx.com/

October 17, 2017 at 4:51 PM d
John Fernando said...

We will get all dtails of TN SSLC result:tnresults.nic.in by just a click

This is nice information of TN SSLC result:Tamilnadu SSLC Result for a click on this link

This gives details of SSLC result : SSLC Result 2018 on a click

Complete TN SSLC result : Tamilnadu SSLC Results 2018 on your finger tip

October 24, 2017 at 6:58 AM d
http://indguru.com said...

http://indguru.com is an educational web portal provides students all types of information regarding government as well as private sector. Students can grab all information regrding latest Jobs, Admit card, Exam Pattern, Exam Schedule etc.

October 26, 2017 at 5:50 PM d
chinu akshay Singh said...

Thank You for giving great information on this topic. I shall very thank full to you. Nice Information you shared in the article. Lots of research you have done on the topic.Thanks for sharing these kinds of great information.
Rajasthan Post Office Recruitment 2017-18

October 27, 2017 at 4:21 PM d
November 1, 2017 at 12:44 AM d
November 2, 2017 at 5:38 PM d
John Fernando said...

Complete Kerala HSC results : keralaresults.nic.in on your finger tip

This gives details of HSC results : Kerala HSC Result on a click

This is nice information of Kerala HSC results 2018:HSC Result 2018 for a click on this link

We will get all details of Kerala HSC results :Kerala HSC Results 2018 by just a click

November 3, 2017 at 10:19 PM d
sophia sophia said...

Thanks for this wonderful post. The information in this article is very helpful to me. Thanks a lot for sharing. Keep blogging.
Interest Waypoint
For truth or dare questions for marriedcouples
Best Truth or Dare Questions for Married Couples

November 13, 2017 at 5:06 PM d
November 14, 2017 at 9:36 AM d
John Fernando said...

Nice to see all TNHSC results tnresults.nic.in in one click

This is super information regarding TNHSC results Tamilnadu HSC Result on simple link

It is very much interesting to get HSC results 2018 of TN HSC Result 2018 on your fingertip

We are very much eager to get this info on Tamilnadu HSC Results 2018 of TN HSC results throught this link

November 17, 2017 at 6:56 AM d
November 18, 2017 at 2:28 PM d
John Fernando said...

Nice to see all Kerala Plus Two results keralaresults.nic.in in one click

This is super information regarding Kerala Plus Two results Kerala Plus Two Result on simple link

It is very much interesting to get Kerala +2 results Kerala +2 Result 2018 on your fingertip

We are very much eager to get this info on Plus Two Result 2018 throught this link

We will get entire results of Kerala plus 2018 on this link Kerala Plus Two Results 2018 Please visit

November 24, 2017 at 7:07 AM d
John Fernando said...

This is very informative to get details of IPL 2018 on single click

We will get live live view of IPL IPL 2018 Live Streaming on this link

Complete details of IPL 2018 on Indian Premier League 2018 this click

Full time live show Indian Premier League 2018 Live Streaming through this link

Complete live streaming of IPL 2018 IPL Live Streaming on this click

Full time information of IPL 2018 Indian Premier League Live Streaming through this link

December 1, 2017 at 1:20 AM d
December 3, 2017 at 10:50 AM d
December 6, 2017 at 9:41 AM d
December 16, 2017 at 9:54 AM d
December 16, 2017 at 9:54 AM d
Trade Jinni said...

Great work was such an great and based on the latest topic. This is a completely interesting to read this blog. I would like to thank you for the efforts you had made for writing this amazing blog. Keep it up the extremely good writing. I am gonna bookmark this page, thanks for the information. I appropriate to your work please visit us create business profile. I will be sure to come back here.
Many thanks!

January 5, 2018 at 4:12 PM d
Jintom Paul said...

This give the complete information of IPL 2018 IPL 2018 Schedule IPL 2018 Kindly click on the link

Complete details of IPL 2018 Points Table available IPL 2018 Points table Please go through this link

Details information regarding IPL 2018 Team & Players IPL 2018 Teams and Players list Click on this

All information of IPL 2018 Auctions IPL 2018 Auctions Click here

To get the live matches of IPL 2018 IPL 2018 Live Matches Click,watch and enjoy

January 24, 2018 at 3:13 PM d
Jintom Paul said...

This gives the detailed results of all exams Exam ResultsPlease check for exam results

Complete information regarding all upcoming exam timetable/date sheetTime TablePlease go thru the link

This link will gives you all new exam admission card/hall ticketAdmit CardPlease click on this link

February 1, 2018 at 4:22 PM d
February 14, 2018 at 1:14 PM d
Akash Chauhan said...

Your information is really useful. This post will surely helps those people who do SMO and also for the newbies to understand more about short keys. Thanks for sharing innovative ideas.
Check out Digital Marketing Training in Jaipur, SEO Company in Jaipur & SEO Course in Jaipur

March 8, 2018 at 10:25 PM d
March 14, 2018 at 4:57 PM d
March 14, 2018 at 4:57 PM d
March 21, 2018 at 11:07 AM d
March 30, 2018 at 2:28 PM d
April 21, 2018 at 7:12 PM d
July 14, 2018 at 12:32 PM d
July 20, 2018 at 9:48 PM d
July 22, 2018 at 10:51 AM d
July 22, 2018 at 6:04 PM d
August 2, 2018 at 11:40 AM d
August 2, 2018 at 9:12 PM d
August 2, 2018 at 10:43 PM d
August 3, 2018 at 6:12 PM d
August 3, 2018 at 6:24 PM d
August 4, 2018 at 9:58 AM d
iMedia Solutions said...

I can recommend everyone to read your article because it is awesome.

Logo Designer Online

August 4, 2018 at 4:52 PM d
August 5, 2018 at 10:37 PM d
August 6, 2018 at 9:35 PM d
August 6, 2018 at 10:09 PM d
August 6, 2018 at 10:09 PM d
August 7, 2018 at 4:01 PM d
August 8, 2018 at 4:04 PM d
August 9, 2018 at 2:43 PM d
August 9, 2018 at 6:08 PM d
August 16, 2018 at 5:27 PM d
September 20, 2018 at 11:32 AM d
September 20, 2018 at 3:08 PM d
September 20, 2018 at 3:52 PM d
September 20, 2018 at 5:12 PM d
September 20, 2018 at 5:13 PM d
September 22, 2018 at 3:58 PM d
September 25, 2018 at 1:43 PM d
September 25, 2018 at 3:00 PM d
September 25, 2018 at 3:01 PM d
October 10, 2018 at 12:04 PM d
October 24, 2018 at 1:08 PM d
Ayesha Saxena said...

This post is so interesting and helpful for all. Thanks for sharing with us.
SEO Company in Dehradun | IT Company in Dehradun

October 30, 2018 at 2:28 PM d
December 4, 2018 at 8:05 PM d
December 12, 2018 at 1:43 PM d

Post a Comment

Subscribe to: Post Comments (Atom)