• We had to restore from a backup today after a failed software update. Backup was from 0000 EDT and restored it at 0800 EDT so we lost about 8hrs. Today is 07/20/2024. More info here.

command: cat



apparently Richard Stallman was one of the major contributors to cat ; you can use it to open a file and output it to something else.I used it in a slackbuild like so:
cat $CWD/slack-desc > $PKG/install/slack-desc
 
cat command examples:

show the contents of /etc/passwd while searching for the user 'rob'
Code:
[root@server ~]# cat /etc/passwd|grep rob
rob:x:500:500::/home/rob:/bin/bash

As this has been necro-posted and raised from the dead, I'll take this opportunity to point out that there is never a need to use cat file | grep pattern.

You can simply use grep or ag instead:
Code:
grep rob /etc/passwd
OR
Code:
ag rob /etc/passwd

ag (aka the silver searcher) - is basically a multithreaded grep on steroids - great for quickly searching through large files, or through code-bases where you have a lot of files!

Just sayin'! ;):p:D
 
wow, old post lol..

Even though I know i don't need to use 'cat file | grep something', i still do it every day from muscle memory haha.. could be i'm catting something, then just uparrow and add the grep to the end most of the time though.
 
Hey there @daysaputra - welcome to the forum. You're in the right place.. there are some tutorials here and plenty of other articles and things to read. I wrote a little ebook (in my signature) that might help, but mainly try to use Linux as much as you can and things will start seeping in.
 
hey @daysaputra this ism y philosophy- you can read as much fishing books as you like; you then have "head knowledge" . the way to get actual knowledge is just to do some actual fishing. Thus google for some linux command lines and just try them. One question do you have the means of trying linux command line ? Do you have access to any linux OS or Windows Subset for Linux (Windows 10). if not thats your first objective.

After that its just a case of opening a terminal window and stating with basics.

$ uname -r
$uname -m
$ pwd
$whoami

$ cd Desktop
$ ls --color

$ cd ~

$ cd Desktop

$ touch play.txt

$ nano play.txt






!
then your on your way :^)
 
Last edited:
  • Like
Reactions: Rob
The cat command will allow you to see an entire file in your terminal quickly. This is more useful for smaller files unless you're grepping for certain things.

It seems this is mostly for text files, but the "strings" command, will often find text in a binary file.

example: strings vlc

But grep will find strings in binary files also.
 
cat command examples:

show the contents of /etc/passwd while searching for the user 'rob'
Code:
[root@server ~]# cat /etc/passwd|grep rob
rob:x:500:500::/home/rob:/bin/bash
What coding language would work with this??
 

Members online


Top