Pipes, Grep, Sort Commands: Linux Tutorial 9

welcome to the video tutorial on Linux pipes GRE P and sort command if you are new to Linux you might wonder what role do pipes play and running the operating system while they are not the real pipes that you have in mind the symbol pipe denotes a pipe and Linux if you want to use two or more commands at the same time and run them consecutively you can use pipes pipes enable UNIX or Linux users to create powerful commands which can perform complex tasks in a jiffy let us understand this with an example when you use the cat command to view a file like the file fruits here which has a lot of pages the prompt quickly jumps to the last page of the file and you do not see the content in the middle to avoid this you can pipe the output of the cat command to less which will show you only once call lengths of content at a time this way you can scroll the file content using the arrow keys and once you reach the end of the file has cue to exit instead of less you can also use the PG and more commands and you can view the file in digestible bits and scroll down by simply hitting the Enter key once you reach the end of the file you can again hit the enter key and you would see the command prompt this was about reading the file so what if you have to search a file for text or a piece of information for this we need to use the GRE key command using this command you can scan a document and reverse you can also customize the search results the way you want the syntax for this command is GRE P space the search strength let us see it in action these are the contents of the file fruits now we will use the GRE P command to look for avocado the syntax for this would be cat space the file name space the pipe then the GRE P command followed by the string that we want to search which would be avocado in this case hitting Enter would search the file fruits for the string avocado let's also use the same command to search for melon this is how the command search for the desired strength in a file you can use the following options with the GI EP command so if you want to display the lines that do not match the searched strength you can use the option - V with the GI EP command let us try some of them on terminal here we will try the option I with the GR EP command the I option filters the string which is a from all the lines in the fire this is why we would get this result the sort command comes in handy when you are trying to list the contents of a file alphabetically the syntax for this command is sort space filename let us say we want to sort the content of the same file fruits alphabetically right now we see that the name of fruits are all jumbled up using the sort command we will easily be able to do it in a jiffy you can use the following extensions for the sort command and get different results so if you want to reverse the sorting of the contents of a file you can use the option hyphen R let us try it and see how it works out using reverse sorting we have changed the alphabetical order of the contents of the fruit file it is now understand what our filters filter is the output from the first command which becomes the input for the second one when you pipe to commands the filtered output of the first command is given to the next one let us understand this with the help of an example we will again use the same file for this example now we want to highlight only the lines that do not contain the character a in lowercase you will do it this way this is how we can filter the output of the first command and use it as the input for the second one now what if we want this result in the reverse order we will need to run this command or the same here the cat command will display the contents of the file fruit the result would be outputted to the GRE P command which will not search for strengths which contain the character a the output of this command would be then worked on by the sort command to display the result in the reverse order this is how we can use filters and summarize what we have learned today pipes help combine two or more commands a filter in a pipe is an output of one command which serves as the input to the next the GRE P command can be used to find strengths and values in a text document sort command sorts out the content of a file alphabetically less PG and more commands are used for dividing a long file into readable bits thank you for watching I will see you in the next tutorial

Channel: Guru99

Views: 205,326

Rating: 4.9016547 out of 5

Keywords: ubuntu, linux, unix, os, tutorial, grep, Pipes, Sort command, grep unix, search strings in linux/unix, greap command made easy, grep command in linux, pipes in linux, grep command in unix, sort command in linux, file permissions in linux, linux pipes, guru99 linux, guru99 linux youtube, guru99, command line, linux basic commands, grep (software)

Id: VgbnndezHbw

Length: 5min 58sec (358 seconds)

Published: Fri Feb 01 2013

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Learn a few key bash commands in Linux.