I would like to display the contents of a text file on the command line. The file only contains 5-6 characters. Is there an easy way to do this?

I wish to directly monitor the serial-over-usb connection to my 3d printer, which runs at 250000 baud. e.g I might monitor it with cat /dev/ttyUSB0 However first I need to set the baud rate, e.g stty -F /dev/ttyUSB0 115200 But if I try and set the baud rate to 250k, it fails: stty -F /dev/ttyUSB0 250000 gives result: stty: invalid argument 250000 It appears that baud rate 250000 is not supported under Ubuntu/Mint. Can anyone suggest an alternative way to monitor this serial connection?

I want to move a dual boot Windows 7 and Linux Mint installation to a larger drive. Right now they exist on a 500GB Samsung SSD. Windows has 289.84 Gib, Linux has 175.42 Gib. I was thinking of dd or cat the boot/efi partition to the beginning of a new 500GB SSD then dd or cat the Widows 7 partition to right after it. Hopefully leaving the rest of the space on that drive unallocated which I can expand later from within windows. Then dd or cat the Linux partition to another 250GB drive. All this would have to be done from a live CD. Then I unplug the Windows/Linux drive and plug in the two new drives and go into the BIOS so I can boot from the Linux drive. Then update-grub and I should have my GRUB boot menu back. Any ideas on weather this will work? Is there an easier way to give these Windows/Linux installations more space and not lose anything? I bet there would be other people who would want to do something similar since SSDs have become cheaper.

I'd like to know if there is a way that I could cat file like php.ini and remove all lines starting with ; For example, if the file contained this: ; - Show all errors, except for notices ; ;error_reporting = E_ALL & ~E_NOTICE ; ; - Show only errors ; ;error_reporting = E_COMPILE_ERROR|E_ERROR|E_CORE_ERROR ; ; - Show all errors except for notices ; error_reporting = E_ALL & ~E_NOTICE and I ran the correct command cat | {remove comments command}, then I would end up with: error_reporting = E_ALL & ~E_NOTICE **Note** - I assumed that cat would be the best way to do this but I'm actually fine with the answer using another utility like awk, sed, egrep, etc.

I have files like this $ cat trapetz x = 0:0.0001:7pi plot(x, sin(x).*cos(x)) Area = trapz(x, sin(x).*cos(x)) $ cat simpson f = inline(sin(x).*cos(x)); Area2 = quad(f, 0, 7pi, 1e-16) I want something like this $ cat -b -t MISSING? trapetz simpson traapetz 1 x = 0:0.0001:7pi 2 plot(x, sin(x).*cos(x)) 3 Area = trapz(x, sin(x).*cos(x)) simpson 1 f = inline(sin(x).*cos(x)); 2 Area2 = quad(f, 0, 7pi, 1e-16) or even better if some easy way to add wc there: $ find |tee |...|wc... I feel now reinventing the wheel, there must be some ready... traapetz: xyz chars 1 x = 0:0.0001:7pi 2 plot(x, sin(x).*cos(x)) 3 Area = trapz(x, sin(x).*cos(x)) simpson: zyx chars 1 f = inline(sin(x).*cos(x)); 2 Area2 = quad(f, 0, 7pi, 1e-16) but I get $ cat -b -t trapetz simpson 1 x = 0:0.0001:7pi 2 plot(x, sin(x).*cos(x)) 3 Area = trapz(x, sin(x).*cos(x)) 4 f = inline(sin(x).*cos(x)); 5 Area2 = quad(f, 0, 7pi, 1e-16) Not really cat needed but some easy tool to share and show code snippets like the above, not pastebin. I want some standard command line thing. I am trying to create easy puzzle -pasting for codegolf.se so people could reproduce things easily...

Is there a command to show the directory or file name when using cat to display the contents of files? For example: assume two files f1.txt and f2.txt are in ./tmp ./tmp/f1.txt ./tmp/f2.txt Then when I do cat ./tmp/*.txt, only the content of the files will be shown. But how to first show the file name, then the content? e.g.: (The needed command): ./tmp/f1.txt: This is from f1.txt and so on ./tmp/f2.txt: This is from f2.txt ... Is there a command to do it? (There seems to be no option for cat to show the file names.)

A lot of command-line utilities can take their input either from a pipe or as a filename argument. For long shell scripts, I find starting the chain off with a cat makes it more readable, especially if the first command would need multi-line arguments. Compare sed s/bla/blaha/ data \ | grep blah \ | grep -n babla and cat data \ | sed s/bla/blaha/ \ | grep blah \ | grep -n babla Is the latter method less efficient? If so, is the difference enough to care about if the script is run, say, once a second? The difference in readability is not huge.

I have the following line:

isUbuntu=$(cat /etc/os-release | grep '^ID=ubuntu$' | wc -l)

It works fine Now, through VSC and mostly with the ShellCheck extension is indicated two warnings messages as follows by parts: For the latter:

Consider using 'grep -c' instead of 'grep|wc -l'.
shellcheck(SC2126)

Therefore the command is changed to:

isUbuntu=$(cat /etc/os-release | grep -c '^ID=ubuntu$')

and it works fine yet For the former:

Useless cat. Consider 'cmd < file | ..' or 'cmd file | ..' instead.
shellcheck(SC2002)

Where it offers two suggestions to apply: * **One**: with cmd < file | .. Then if _cmd_ is the cat command then the command is changed to:

isUbuntu=$(cat < /etc/os-release | grep -c '^ID=ubuntu$')

and it works fine yet. Therefore until this point the two original messages are fixed. Now the reason of this post is about the second suggestion: * **Two**: with cmd file | .. Is it not the same cat /etc/os-release command applied from the beginning? Did I miss something? Therefore: **Question** * How to apply correctly the cmd file | .. suggestion? Pls provide an example

Im building a script to load from a file content and then use to cat and grep in another file. The problem is that is not showing any values while executing the grep. If i do the command manually it will retrieve the data. i already use the while but the issue is the same. the output6.txt is always empty. the echo seems to work, so it seems to be the grep or cat issue. Sample from BlockspamCLIs.txt i have the values: 4412345 441236 2367890 Sample All_events.csv file 1,441236,20220909120909,test 2,441237,20220909120909,test 3,441232,20220909120909,test 4,44136,20220909120909,test 5,2367890,20220909120909,test As an output im expecting to retrieve and store and record inside of the CSV file that contains the number for example: 1,441236,20220909120909,test 5,2367890,20220909120909,test my script: for i in cat BlockspamCLIs.txt do grep $i *_All_events.csv >> output6.txt echo $i done thank you in advance.

When I try to do

apt update

in pop os I get error regarding to public key. Here is the complete output:

Hit:1 https://dl.yarnpkg.com/debian  stable InRelease                                                                            
Ign:2 https://releases.warp.dev/linux/deb  stable InRelease                                                                      
Hit:3 https://releases.warp.dev/linux/deb  stable Release                                                       
Hit:5 https://download.sublimetext.com  apt/stable/ InRelease                                                   
Err:5 https://download.sublimetext.com  apt/stable/ InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F57D4F59BD3DF454
Hit:6 http://apt.pop-os.org/proprietary  jammy InRelease
Hit:7 http://apt.pop-os.org/release  jammy InRelease
Get:8 http://apt.pop-os.org/ubuntu  jammy InRelease [270 kB]
Hit:9 http://apt.pop-os.org/ubuntu  jammy-security InRelease                                                                     
Hit:10 http://apt.pop-os.org/ubuntu  jammy-updates InRelease                                                                     
Hit:11 http://apt.pop-os.org/ubuntu  jammy-backports InRelease                                                                   
Ign:12 http://apt.pop-os.org/ubuntu  jammy/restricted amd64 DEP-11 Metadata                                                      
Ign:13 http://apt.pop-os.org/ubuntu  jammy/restricted DEP-11 48x48 Icons                                                         
Ign:14 http://apt.pop-os.org/ubuntu  jammy/restricted DEP-11 64x64 Icons                                                         
Ign:15 http://apt.pop-os.org/ubuntu  jammy/restricted DEP-11 64x64@2 Icons                                                       
Ign:16 http://apt.pop-os.org/ubuntu  jammy/restricted DEP-11 128x128 Icons                                                       
Ign:12 http://apt.pop-os.org/ubuntu  jammy/restricted amd64 DEP-11 Metadata                                                      
Ign:13 http://apt.pop-os.org/ubuntu  jammy/restricted DEP-11 48x48 Icons                                                         
Ign:14 http://apt.pop-os.org/ubuntu  jammy/restricted DEP-11 64x64 Icons                                                         
Ign:15 http://apt.pop-os.org/ubuntu  jammy/restricted DEP-11 64x64@2 Icons                                                       
Ign:16 http://apt.pop-os.org/ubuntu  jammy/restricted DEP-11 128x128 Icons                                                       
Ign:12 http://apt.pop-os.org/ubuntu  jammy/restricted amd64 DEP-11 Metadata                                                      
Ign:13 http://apt.pop-os.org/ubuntu  jammy/restricted DEP-11 48x48 Icons                                                         
Ign:14 http://apt.pop-os.org/ubuntu  jammy/restricted DEP-11 64x64 Icons                                                         
Ign:15 http://apt.pop-os.org/ubuntu  jammy/restricted DEP-11 64x64@2 Icons                                                       
Ign:16 http://apt.pop-os.org/ubuntu  jammy/restricted DEP-11 128x128 Icons                                                       
Ign:12 http://apt.pop-os.org/ubuntu  jammy/restricted amd64 DEP-11 Metadata                                                      
Err:13 http://apt.pop-os.org/ubuntu  jammy/restricted DEP-11 48x48 Icons                                                         
  404  Not Found [IP: 108.157.60.76 80]
Ign:14 http://apt.pop-os.org/ubuntu  jammy/restricted DEP-11 64x64 Icons                                                         
Ign:15 http://apt.pop-os.org/ubuntu  jammy/restricted DEP-11 64x64@2 Icons                                                       
Ign:16 http://apt.pop-os.org/ubuntu  jammy/restricted DEP-11 128x128 Icons                                                       
Ign:12 http://apt.pop-os.org/ubuntu  jammy/restricted amd64 DEP-11 Metadata                                                      
Fetched 270 kB in 23s (11.7 kB/s)                                                                                               
Reading package lists... Done
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://download.sublimetext.com  apt/stable/ InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F57D4F59BD3DF454
W: Failed to fetch https://download.sublimetext.com/apt/stable/InRelease   The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F57D4F59BD3DF454
E: Failed to fetch http://apt.pop-os.org/ubuntu/dists/jammy/restricted/dep11/icons-48x48.tar   404  Not Found [IP: 108.157.60.76 80]
W: Some index files failed to download. They have been ignored, or old ones used instead.

When I want to see

/etc/apt/sources.list

file the output says:

This file is deprecated in Pop!_OS.
See man deb822 and /etc/apt/sources.list.d/system.sources.

And the output of

/etc/apt/sources.list.d/system.sources

file is

X-Repolib-Name: Pop_OS System Sources
Enabled: yes
Types: deb deb-src
URIs: http://apt.pop-os.org/ubuntu/ 
Suites: jammy jammy-security jammy-updates jammy-backports
Components: main restricted universe multiverse
X-Repolib-Default-Mirror: http://apt.pop-os.org/ubuntu 
X-Repolib-ID: system

I can provide additional informations if you like. Cheers

I read this post today and the answers claimed that certain escape sequences could be dangerous in some terminals, this post also has people saying that it can even be unsafe to simply view log files. Note the word "view" there, ever since I started using GNU/Linux I've always thought of cat as a way to view text files, but the more I read about it, the more I see that cat shouldn't be used for that at all. My questions are: are these answers still true today? Have there been many patches to secure terminals? Should I be afraid of running applications over an ssh connection because they can infect the terminal I'm viewing them on?

I've got a bunch of text files and pdfs in a directory. If I enter evince *.pdf ..all the pdfs open up in separate windows, I do this quite often. When I enter cat *.txt ..was pleasantly surprised to see it shows all the text files in the terminal. Problem is it has them all just laid end to end you can't really tell where one ends and the next one begins or which one you're looking at as you scroll. Is there an improvement to this cat command whereby it will give the name of the file in the terminal before dumping its contents? That's the main point, but perhaps a line or blank space after the text file ended so you would know it had ended would also be nice to have. Otherwise, a better terminal command than cat which accomplishes this.