cat

Do not use cat when you can avoid it. This is very annoying.

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The unneeded use of the cat command is very annoying, this is wasteful. Something like this is very annoying to see. cat unixhell.txt | sed ‘s/program/application/g’cat unixhell.txt | sed ‘s/program/application/g’ Do it like this instead. This is the proper way to use sed. sed ‘s/program/application/g’ unixhell.txtsed ‘s/program/application/g’ unixhell.txt The user gets the same output but … Read more

The proper way to use grep without cat. And some nice tricks.

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This is the proper way to use grep. You do not need to use cat at all. This method works well and is one command, not two piping together. jason@jason-desktop:~/Documents$ grep apt-get ../.bash_history sudo apt-get update sudo apt-get install me-tv sudo apt-get update && sudo apt-get install xvst apt-get moo apt-get moojason@jason-desktop:~/Documents$ grep apt-get ../.bash_history … Read more

A better way to use grep to search files and folders. You do not need to use cat.

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This is how to use grep to search a file without using cat. homer@neo:~/Documents$ grep "gcc" ../.bash_history gcc my.cpp gcc gcc hello.java gcc hello.java gcc hello.java gcc hello.java gcc mein.c -o mein gcc -c99 mein.c -o mein gcc -std=c99 mein.c -o mein gcc hello.c -o hello gcc hello.c -o hello gcc hello.c -o hello gcc … Read more

How to use the Linux cat command to read the contents of a folder. This is a cool trick.

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This is a neat trick that allows you to use cat to view the contents of a directory. This library is loaded before the cat command is executed and modifies its behavior to allow you to use cat to list a directory. #include <unistd.h> #include <stdio.h> #include <dirent.h> #include <string.h> #include <stdlib.h> #include <sys/types.h> #include … Read more

Linux commands that prove useful for your day to day workflow.

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The UNIX tail command is very useful for viewing the last number of lines of a logfile. As in this example. Showing the last 10 lines in the file /var/log/syslog. |{~}-{Thu Feb 16 21:36:44} -{john@deep-thought } $ tail -n 10 /var/log/syslog Feb 16 21:31:01 deep-thought cron[1480]: (*system*anacron) WRONG FILE OWNER (/etc/cron.d/anacron) Feb 16 21:31:29 deep-thought … Read more

Interesting /bin/cat trick. How to join mp3 files together.

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I was playing around with /bin/cat on my FreeBSD laptop and I typed this command. This is a useful trick to join mp3 files together in one long audio file. jason@Yog-Sothoth:~/Music$ cat Dune\ \(1983\)\ OST\ -\ Dune\ Prophecy\ \(Long\ Version\)-UWFm2LIYNjg.mp3 > ambient-winter.mp3jason@Yog-Sothoth:~/Music$ cat Dune\ \(1983\)\ OST\ -\ Dune\ Prophecy\ \(Long\ Version\)-UWFm2LIYNjg.mp3 > ambient-winter.mp3 And now … Read more