Using crontab some times can get little confusing due to the field names, values, syntax, redirection. Learn crontab with different examples for each fields, you can use with minor modifications or create new ones based off these examples
What does 2>&1 mean in shell ?
Linux and Unix shell redirections are very useful in command line and shell scripting to redirect and collect errors and outputs. Standard output and standard errors are used a lot but still there is lot of confusion about the meaning, actual execution and correct way to utilize it. learn about 2>&1 redirection with examples to use in your scripts and commands.
ssh examples, usage, Options, protocol
The Secure Shell (SSH) Protocol is a protocol for secure remote login and other secure network services over an insecure network. ssh and sftp are two commands used to login and file transfer securely. Learn about ssh usage with examples & available options.
iostat, vmstat, netstat – Performance Monitoring & Tuning in Unix & Linux
iostat, vmstat, netstat are the tools in Linux and Unix operating system which provides important system performance data relating to disk, memory network and cpu. By analyzing the data it is possible to determine the potential bottleneck which is impacting the system performance and take corrective action accordingly.
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Exit & Error Codes in bash and Linux OS
bash and Linux OS provides an error code on encountering failure or exist status code. As a numeric code is displayed it is for the user to understand and act on that error code. find the ready reference to the exit codes and error codes with their meaning to help debug the issues faster.
Strace Examples, Options & Usage
strace is an important debug tool in Linux and Unix systems to trace system calls and signals. strace is used where the program does not provide sufficient information for the cause of failures and we need to go a level deeper in to system calls and signal levels to find out potential issues.
netstat – 10 Most common usage with examples
netstat is one of the most commonly used command to print the network information, However the output of netstat may be difficult to understand with lots of rows and columns of data. With examples in this article you will be able to to use right option to get the right information along with complete understanding of the netstat command output.
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vi editor cheat sheet in pdf format
vi editor , pronounced as Vee Iee editor is the default text editor in Unix and Linux distribution. For new learners it may be difficult to get used to vi editor commands. To make this easy here is the vi editor cheat sheet in PDF format which can be printed and used for ready reference.
ssh Without Password in Few Simple Steps
ssh access without password is a time saver and a must for automated scripts to copy files and transfer data across different servers. Setting us password less access can be tricky but you should be able to configure it using examples in this article.
bash for loop Explained with Examples
bash for loop is one of the most popular used function for the data processing . Learn more about bash for loop basic construction , how to process a range of data, define increments, using command outputs as inputs to for loop and more