@@diogofelix8626 -- Not better but certainly more OCD. I myself was looking for the use '^\s*$' post so I wouldn't be repeating someone...hate it when I do that. That said, you should use use '^\s*$' (hate it when I do that, but I repeat myself again). I'm currently working on code someone else wrote, for some ridiculous OCD reason he put a blank line after every single line in his code and it was driving me crazy so I wrote a script that ran sed against every file and took them out, better no blank lines at all than only half the code that would fit on my screen, at least that's what my OCD tells me. Strangely considering this annoying habit he seemed to also insist on conciseness like foreach($x in $y) while (blah) if (j) dosomething; all in a single line with no braces instead of in tabbed blocks. One annoying extreme to the exact opposite annoying extreme. He also wrote all his mysql statements inline with no returns (didn't use views at all) so I have to deal with 4000 character long sql select statements in one line (inside the call to mysql, not even a separate variable). It's like reading War and Peace with no hard returns and worse if you're trying to debug it. Plus it's almost always with nested queries and no views, like he was still working with mysql 4 (he was actually on 5.2). And the inserts/updates are worse, all built by concatenating , x=$y onto a sql string variable into one huge insert/update statement, and not even a prepared statement, just one long string that has to have quotes in all the right places. And on top of that not only do the forms have inputs with names completely different than the table column names, they're often retrieved into local variables that have completely different names that also don't match the table columns before this concatenation occurs. His tables are like spreadsheets so I have tables with 160 columns with the vast majority unused and half of them also in a related table but every single one goes into the update and insert statements because even if there's no change he saves it, so I have multiple tables with the same data but each have different values depending on what form it's saved from. I spend a lot of time cursing. Well that went longer than necessary and completely left the subject at hand, just had to get that off my chest.
@diogofelix \+ does the same as {1,} if you think more characters in your expression make it more expressive you clearly forgot every character has meaning. by adding more it becomes less obvious
@@rodrigorodriguez509 The thing is that we often don't know these features even exist, but once we are aware of them we can learn further from other sources.
Luke: "You're not autistic, you're normal" Also Luke: Makes torrent status bar module that utilizes sed when you could just open your torrent client instead.
Why would you decide to do something in a way that has already been tried and proven to work? It's not gonna be the art of solving problems of your own making, and that's cringe bro.
The name comes from the program ed, as in editor. Ed uses special regex for editing. Sed is the same as ed but it ONLY uses regex for editing. Vi, the text editor, is built ON TOP of ed so you can use all the commands from sed in vi. Vim is BASED ON the idea of vi and all the commands work there too. Then there's acme/sam and vis. Regex is a big part of acme and sam because you have to use the mouse otherwise. It uses special regex called plan9 regex. Vis is basically a cut down version of vim that uses the plan9 regex (which is superior). I recommend trying to write scripts in ed instead of using awk, if you learn the sed syntax!
"sed 11q" actually prints the 11th line. To quit before the 11th line gets printed you would need to use GNU extension 'Q' ( "sed 11Q" ), or actually use "sed 10q". ( try "seq 20 | sed 10q" vs "seq 20 | sed 11Q" ).
This is very helpful, I appreciate this sort of content. I've been on linux for a few months now, but I struggle with scripts because I dont understand basic stuff like this.
You might not have to download 500mb of python modules to make a torrent statusbar thing but you do need to download 500mb of fonts to find one with the emojis in it
I have a funny(for me) story about sed. Me and my mentor wrote a script to setup a DNS server just because we were curious if we could do it. We could but had to replace " to ' and had to thinker a bit to figure it out that we should have used sed to replace them. It was a good experience
Thank you so so much! Your skills show through when explaining. Einstein said something like, If you can't explain it to a five-year-old, then you don't understand it yourself. Awesome video!
I would be interested in videos about grep/pgrep and awk too! These small videos just show the peak of the iceberg of what's possible with these utilities but you showcasing a real-world-example gave me an idea what i could use sed for; i guess it got me started and woke my interest! Having similar videos for other useful utilities would be really nice!
Sometimes, unintentionally, people leave blank lines with trailing whitespaces (you will see them in visual mode, but the "s/^$/ d" won't). So, it would be safer to delete blank lines like that: "s/^\s*$/ d"
The syntax you used for providing multiple expressions to sed ( sed 'expression;anotherexpression' ) works with GNU, but it's non-standard. Not every implementation of sed can handle that. The standard way afaik is to do sed -e 'expression' -e 'anotherexpression'
It’s really great to have these references, please reach out and donate to Luke if you can, he’s one of the few Linux youtubers (i’m aware of) posting video documentation at this level. But also, RTFM. Always read the manual, stop telling yourself it’s hard to do, just dont be ADD like me and have patience. I am hoping i can contribute to Artix at some point, they really need talent, genius guys
The substitute command in vim is very similar but generally used with line ranges and can work with visually selected blocks, or from courser plus n lines. :%s/a/b/n # % is shorthand for all lines, n just prints number of matches no actual change :3,12s/a/b/c # lines 3 to 12, c is the confirm-each flag which highlights and asks before doing
btw I read that usually when you combine sed, grep and awk, you can usually create the same effect by just using one of them if you know all the commands. I never figured out how though. I only ever use awk to for stuff like "{print $2}" but I guess its a fully functional scripting language.
Lol I always used to write "command | head -5 | tail -1" to get the 5th line in a command output. Now I can just do "command | sed -n 5p". I learned some regex but only really used s/ commands
I'd just like to interject for a moment. What you’re referring to as Linux, is in fact, GNU/Linux, or as I’ve recently taken to calling it, GNU plus Linux. Linux is not an operating system unto itself, but rather another free component of a fully functioning GNU system made useful by the GNU corelibs, shell utilities and vital system components comprising a full OS as defined by POSIX. Many computer users run a modified version of the GNU system every day, without realizing it. Through a peculiar turn of events, the version of GNU which is widely used today is often called “Linux”, and many of its users are not aware that it is basically the GNU system, developed by the GNU Project. There really is a Linux, and these people are using it, but it is just a part of the system they use. Linux is the kernel: the program in the system that allocates the machine’s resources to the other programs that you run. The kernel is an essential part of an operating system, but useless by itself; it can only function in the context of a complete operating system. Linux is normally used in combination with the GNU operating system: the whole system is basically GNU with Linux added, or GNU/Linux. All the so-called “Linux” distributions are really distributions of GNU/Linux.
getting rid of trailing white space can be required under certain circumstances otherwise you end up with errors you have to figure out the cause of and since you can't see trailing white space it can be a nightmare .
@@auslegungssache I actually use vis, neovim, and emacs evil mode depending on what files I'm editing. Out of the three editors, vis and neovim are my favorites just because I've been infected with the vim bug for 2.5 years now :)
Som chat applications support the substitute command. Skype, for example, will replace "I care" with "IDGAF" in your last message if you send "s/I care/IDGAF/" in a new message.
bruh, I've used vim for months and this is the first time I learn why some of their keybindings are so weird (don't tell me that ^ for first non blank character and $ for the end of the line is intuitive because it's not)
Hi, can you please make me understand the meaning of the "sed -i 's@^.*$@> awk.txt" command ? it will add > in the end of whole lines in file ....and how can we delete these > from the whole file again ?
could you please make a video that how you manage all window in separately and with command shift and open etc..... I know vim tab and window but they are all in vim env and not os.
good tutor Luke! old video as fuck but maybe for somene it will be helpful, I propose to use ^\s*$ as a pattern to delete blank lines, lot of time blank lise are in fact lines with some tabs/spaces, so with this pattern you also will delete it
for example, if a have /*a comments*/ and some empty lines after that. We have a command like " " that do the opposite? or something not so trickie to do it.. I tried " " to see if help but I get an "r".. I saw some things in internet but all looks a little trickie to do it. Looks easier and faster do it manually.. Thanks for your content, I like your perspective:D
This command would still print blank lines with spaces so use '^\s*$' for maximum autism
'^\s{1,}?$' would be better
edit: actually just * matches 0 or more times, so, not better (but maybe more expressive)
came to the comments for this
Doesn't catch tab characters.
@@diogofelix8626 -- Not better but certainly more OCD. I myself was looking for the use '^\s*$' post so I wouldn't be repeating someone...hate it when I do that.
That said, you should use use '^\s*$' (hate it when I do that, but I repeat myself again). I'm currently working on code someone else wrote, for some ridiculous OCD reason he put a blank line after every single line in his code and it was driving me crazy so I wrote a script that ran sed against every file and took them out, better no blank lines at all than only half the code that would fit on my screen, at least that's what my OCD tells me. Strangely considering this annoying habit he seemed to also insist on conciseness like foreach($x in $y) while (blah) if (j) dosomething; all in a single line with no braces instead of in tabbed blocks. One annoying extreme to the exact opposite annoying extreme. He also wrote all his mysql statements inline with no returns (didn't use views at all) so I have to deal with 4000 character long sql select statements in one line (inside the call to mysql, not even a separate variable). It's like reading War and Peace with no hard returns and worse if you're trying to debug it. Plus it's almost always with nested queries and no views, like he was still working with mysql 4 (he was actually on 5.2). And the inserts/updates are worse, all built by concatenating , x=$y onto a sql string variable into one huge insert/update statement, and not even a prepared statement, just one long string that has to have quotes in all the right places. And on top of that not only do the forms have inputs with names completely different than the table column names, they're often retrieved into local variables that have completely different names that also don't match the table columns before this concatenation occurs. His tables are like spreadsheets so I have tables with 160 columns with the vast majority unused and half of them also in a related table but every single one goes into the update and insert statements because even if there's no change he saves it, so I have multiple tables with the same data but each have different values depending on what form it's saved from. I spend a lot of time cursing.
Well that went longer than necessary and completely left the subject at hand, just had to get that off my chest.
@diogofelix \+ does the same as {1,}
if you think more characters in your expression make it more expressive you clearly forgot every character has meaning. by adding more it becomes less obvious
Please make more videos like this.
You could have learned this on your own anytime through innumerable sources, and the same is true for any other video he would do.
@@rodrigorodriguez509 The thing is that we often don't know these features even exist, but once we are aware of them we can learn further from other sources.
7:07 Vim muscle memory detected.
Hahah, I think he has vi mode in his terminal, so he probably just forgot to hit Esc before k
Luke: "You're not autistic, you're normal"
Also Luke: Makes torrent status bar module that utilizes sed when you could just open your torrent client instead.
I liked the idea of sorting those text fields by sed and sort at 13:50, that was ingenious. (but, I'm quite green at scripting)
Why would you decide to do something in a way that has already been tried and proven to work? It's not gonna be the art of solving problems of your own making, and that's cringe bro.
yep, because opening the torrent client just to see torrent statistics is definitely not autistic
Man is just flexing his skills. And that was actually useful!
@O B to sort them
The name comes from the program ed, as in editor. Ed uses special regex for editing. Sed is the same as ed but it ONLY uses regex for editing. Vi, the text editor, is built ON TOP of ed so you can use all the commands from sed in vi. Vim is BASED ON the idea of vi and all the commands work there too.
Then there's acme/sam and vis. Regex is a big part of acme and sam because you have to use the mouse otherwise. It uses special regex called plan9 regex. Vis is basically a cut down version of vim that uses the plan9 regex (which is superior). I recommend trying to write scripts in ed instead of using awk, if you learn the sed syntax!
I know only a little bit of ed. But is is as powerful for text manipulation as awk?
It would be nice if you have some ed script example.
"sed 11q" actually prints the 11th line. To quit before the 11th line gets printed you would need to use GNU extension 'Q' ( "sed 11Q" ), or actually use "sed 10q". ( try "seq 20 | sed 10q" vs "seq 20 | sed 11Q" ).
How about just do sed 10q
This content will never get old. All LINUX newbies should see this to begin exploration of SED, regular expressions and AWK.
This is extremely helpful. I didn't realise that a lot of these sed commands are the same in vim, this greatly reduced the learning curve for me
It' amazing how he organize and sort everything. Because of him, my i3 looks beautiful. Thank you Luke for videos like this... 😁
This is very helpful, I appreciate this sort of content. I've been on linux for a few months now, but I struggle with scripts because I dont understand basic stuff like this.
Thank you Luke, i'm actually studying for the LFCS certification and videos like this one are a great resource !!!
You might not have to download 500mb of python modules to make a torrent statusbar thing but you do need to download 500mb of fonts to find one with the emojis in it
the struggle is real
Decide yourself which task is easier to do.
I have a funny(for me) story about sed. Me and my mentor wrote a script to setup a DNS server just because we were curious if we could do it. We could but had to replace " to ' and had to thinker a bit to figure it out that we should have used sed to replace them. It was a good experience
Thank you so so much! Your skills show through when explaining. Einstein said something like, If you can't explain it to a five-year-old, then you don't understand it yourself. Awesome video!
I would be interested in videos about grep/pgrep and awk too! These small videos just show the peak of the iceberg of what's possible with these utilities but you showcasing a real-world-example gave me an idea what i could use sed for; i guess it got me started and woke my interest! Having similar videos for other useful utilities would be really nice!
Sometimes, unintentionally, people leave blank lines with trailing whitespaces (you will see them in visual mode, but the "s/^$/ d" won't). So, it would be safer to delete blank lines like that: "s/^\s*$/ d"
The syntax you used for providing multiple expressions to sed ( sed 'expression;anotherexpression' ) works with GNU, but it's non-standard. Not every implementation of sed can handle that. The standard way afaik is to do sed -e 'expression' -e 'anotherexpression'
I love how you make everything so simple
It’s really great to have these references, please reach out and donate to Luke if you can, he’s one of the few Linux youtubers (i’m aware of) posting video documentation at this level. But also, RTFM. Always read the manual, stop telling yourself it’s hard to do, just dont be ADD like me and have patience. I am hoping i can contribute to Artix at some point, they really need talent, genius guys
Cool as, been waiting for a sed/awk video
This is so thorough. Exactly what I've been looking for!
The substitute command in vim is very similar but generally used with line ranges and can work with visually selected blocks, or from courser plus n lines.
:%s/a/b/n # % is shorthand for all lines, n just prints number of matches no actual change
:3,12s/a/b/c # lines 3 to 12, c is the confirm-each flag which highlights and asks before doing
I'm once again impressed by how knowledgeable Luke is o.O. Thank you Sir Luke.
This was FANTASTIC Luke. Thank you!
man your explanation is far beyond this universe , i know i know , many thanks
watching this after finishing a "awk" course, makes sed looks very easy and simple, awk is the strongest
Ah! /g = "greedy." If one understands regular expressions, one knows of greedy.
That's an excellent tutorial, thanks, Luke. Very helpful.
btw I read that usually when you combine sed, grep and awk, you can usually create the same effect by just using one of them if you know all the commands. I never figured out how though. I only ever use awk to for stuff like "{print $2}" but I guess its a fully functional scripting language.
11:13 For anyone that wants to look these up and learn what they do, they're called 'anchors'
Lol I always used to write "command | head -5 | tail -1" to get the 5th line in a command output. Now I can just do "command | sed -n 5p". I learned some regex but only really used s/ commands
That gruvbox look fresh af
I appreciate what you did in this video.
I always learn cool stuff from your vids. sed awk commands... just really cool
Linux is addictive.
The more I lear about Linux the more I can do with less effort...
The more I want Linux.
I'd just like to interject for a moment. What you’re referring to as Linux, is in fact, GNU/Linux, or as I’ve recently taken to calling it, GNU plus Linux. Linux is not an operating system unto itself, but rather another free component of a fully functioning GNU system made useful by the GNU corelibs, shell utilities and vital system components comprising a full OS as defined by POSIX.
Many computer users run a modified version of the GNU system every day, without realizing it. Through a peculiar turn of events, the version of GNU which is widely used today is often called “Linux”, and many of its users are not aware that it is basically the GNU system, developed by the GNU Project. There really is a Linux, and these people are using it, but it is just a part of the system they use.
Linux is the kernel: the program in the system that allocates the machine’s resources to the other programs that you run. The kernel is an essential part of an operating system, but useless by itself; it can only function in the context of a complete operating system. Linux is normally used in combination with the GNU operating system: the whole system is basically GNU with Linux added, or GNU/Linux. All the so-called “Linux” distributions are really distributions of GNU/Linux.
Haha great original joke!!
>uses emojis
>uses 'LMAO'
I think I'm starting to see a pattern
This video is fantastic. Please do more like this.
Finally the sed tutorial I have been looking for
Amazing, thanks to you I leaned sed. Great tool to master!
Excellent! Recently dipped my toe in regex, so this was a perfect follow up
Thank you, Luke. You are a real human bean.
getting rid of trailing white space can be required under certain circumstances otherwise you end up with errors you have to figure out the cause of and since you can't see trailing white space it can be a nightmare .
Replacing new line seems to be complicated, compared to `tr` command. I though we could use `
` such as in vim.
This helped me understand sed, thanks man!!
Luke is a real human bean!1!! A real hero!
Thanks a lot! This is a great explanation! It would be cool to see more ways of sed and awk usage. Waiting on videos! ;)
Fantastic tutorial, thanks for sharing your talent dude!
nice
Need more videos like this. Thanks for you a good tutorial.
TFW you realize that Plan9 regular expressions exists to supplant grep's regular expressions :(
Finally someone who uses plan9! Do you use vis?
@@auslegungssache I actually use vis, neovim, and emacs evil mode depending on what files I'm editing. Out of the three editors, vis and neovim are my favorites just because I've been infected with the vim bug for 2.5 years now :)
thank you for your service
Awesome job! Your very smart and I like your creativity. Keep it up
Thanks a lot! This was really helpful.
You are awesome Luke, bless ya, Thanks a lot for such a great video :)
I enjoyed this one a lot, thanks
sed - stream editor for filtering and transforming text
Quality content
I love this type of videos. I learnt a lot!
thanks, I wish I could like this video more than once!!!
Nice video on sed command.
I personally use 's/something/&_else/g' quite a bit. Is damn useful.
Your terminal color scheme/transparency is so nice ! If you don't mind could you detail the setup? Np if not.
Nice practical video!
Pls don't place significant text in top bcz youtube hides it when i move mouse or control video stream
Nice, short and concise.
Have you looked into Wayland at all? Could make for an interesting video.
hey luke, can you make a video on BSD in general?
Som chat applications support the substitute command. Skype, for example, will replace "I care" with "IDGAF" in your last message if you send "s/I care/IDGAF/" in a new message.
the ' /^$/ d' doesn't remove "visually empty" lines. so lines with only spaces or tabs
/^\s*$/ d
solved
Great video, would be cool to hear how you have configured your fonts, unicode, emojis and how you made them all work in the terminal
do you have a specific issue? I've struggled with that recently, maybe there's a chance I can help
can you do a video about larbs? like how it works and interchanging things inside it
How would you replace 'print "a"' with 'print("a")'?
thanks man this is great
Nice work
Spoke 15 minutes for one command. That's America in a nutshell for you.
Sed requires more than 15 mins. Especially to read the books published on it.
bruh, I've used vim for months and this is the first time I learn why some of their keybindings are so weird (don't tell me that ^ for first non blank character and $ for the end of the line is intuitive because it's not)
perfect thank you
How to comment a line if you find a string in the mid of the line and that string you are getting from a file in a variable. please help me
Great video. To delete blank lines with spaces: sed “/^[ \s]*$/ d” .file
Do you have a video on how you made the torrent status module?
how to replace the third occurence using sed ?
What terminal is it? How do you clean it without lost your current text? Thanks for the tutorial 🙋
what if we want to make a change in more than one file?
Inspiring
Hi, can you please make me understand the meaning of the "sed -i 's@^.*$@> awk.txt" command ? it will add > in the end of whole lines in file ....and how can we delete these > from the whole file again ?
thanks i luked at this video
Does this man ever rest?
could you please make a video that how you manage all window in separately and with command shift and open etc..... I know vim tab and window but they are all in vim env and not os.
why the whitespace before d in sed when deleting newlines? (newbie)
Something about "Two instances of LMAO" makes me LMAO
What are your thoughts on perl?
daddy fitmc is that you?
good tutor Luke! old video as fuck but maybe for somene it will be helpful, I propose to use ^\s*$ as a pattern to delete blank lines, lot of time blank lise are in fact lines with some tabs/spaces, so with this pattern you also will delete it
SO Good
Very informative, as usual. (y)
Hi, how to remove line after colon (:) ex: george:1234516 i need to remove george or number (not less the colon) Thankyouuu..
I'm too sexy for your gawk, too sexy for your mawk... and so on.
for example, if a have /*a comments*/ and some empty lines after that. We have a command like "
" that do the opposite? or something not so trickie to do it.. I tried "
" to see if help but I get an "r".. I saw some things in internet but all looks a little trickie to do it. Looks easier and faster do it manually.. Thanks for your content, I like your perspective:D
I found the problem. If you have also tabs or something like that dont work
In the last 3 minutes he explain it, I paused the video before that part to try by my own. That is really cool stuff. Thanks agaain Sir!!
uniq has a sort option
Do an in depth vid on awk