Why you should not rely on /bin/cat to read a script before running it…
How to write a script for Linux in bash that can hide code from cat.
Read MoreTag: cat
Do not use cat when you can avoid it. This is very annoying.
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…
Read MoreHow to cat a gzipped logfile with gunzip properly.
The gunzip utility can uncompress logfiles that are gzipped in archives, but this is not needed. To read a logfile that is gzipped, you can also use this command to print the contents to a terminal and not bother uncompressing the file. This allows reading log files in /var/log without…
Read MoreThe proper way to use grep without cat. And some nice tricks.
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…
Read MoreHow to read a file and display the contents with Python.
How to read a file and display the contents with Python. This sample code reads and outputs the contents of a file using Python. This is a very simple code sample for reading in a file and displaying it. #!/usr/bin/env python forme = "f.txt"; # Read a file…
Read MoreA better way to use grep to search files and folders. You do not need to use cat.
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…
Read MoreHow to use the Linux cat command to read the contents of a folder. This is a cool trick.
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>…
Read MoreLinux commands that prove useful for your day to day workflow.
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…
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