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.
Learn to use awk for text and data extraction, data processing, validation, generate reports for analysis, automation with with the help of examples of if else , compare & arrays plus regular expressions & built in operational variables, meaning, examples &command syntax.
Continue reading “awk Commands, Examples & Meaning”
Application monitoring is a very important aspect of a project but unfortunately not much attention is paid to develop the effective monitoring while the projects are still movingh to completions. Once project is complete & live lack of proper monitoring costs in terms of downtime when support persons are not aware if application is having some problems or application not working at all. Continue reading “Application Monitoring”
Learn about Linux and Unix date & time formating with the help of simple explanation and added example. Date command in Unix & Linux is used to format date as well as time. First portion of this article covers Date function and the second portion has the time function covered. Continue reading “Linux & Unix Date Format Examples”
This is a Unix Tutorial where you can learn Unix OS Basics to get started with UNIX and Linux operating systems and covers Unix Directory structure , Unix Commads and Unix Shells
Learn about the default text editor, vi, pronounced as ”vee eye”, in Unix, Linux and other Unix like systems. A short, concise vi quick reference lets you get started with vi today. Explains vi editor mode & vi commands with examples for editing in vi. Click to download and print vi editor Cheat Sheet in PDF format.
Continue reading “vi editor Quick Reference & Cheat Sheet”
Unix and Linux backup and restore can be done using backup commands tar, cpio ufsdump, dump and restore. Though these commands may be sufficient for small setups in order to take a enterprise backup you have to go in for some custom backup and restore solutions like Symatic netbackup, EMC networker or Amanda.
Any backup solution using these commands depends on the type of backup you are taking as these backup commands offers different capabilities.
Continue reading “Backup Commands in Linux & Unix with Usage and Examples”
Setting up cron jobs in Unix, Solaris & Linux
cron is a Unix, solaris, Linux utility that allows tasks to be automatically run in the background at regular intervals by the cron daemon. Continue reading “Crontab – Quick Reference”
Learn about the Unix commands with their usages and examples.
This Unix command tutorial introduces you with some of the most popular and useful commands used in nix operating system to get you started with Unix.
All Unix OS comes with online manual system, man, which can be used used as ,man
Continue reading “Unix Commands Tutorial”
fsck, similar to chkdsk in windows, checks and repairs the file system in Unix & Linux operating systems. Learn about fsck modes, phases & fsck errors messages
fsck, File System Consistency checK, is a system utility in Unix, Linux and other Unix like systems for checking and repairing file system inconsistencies.
File system can become inconsistent due to several reasons and the most common is abnormal shutdown due to hardware failure, power failure or switching off the system without proper shutdown. Due to these reasons the superblock in a file system is not updated and has mismatched information relating to system data blocks, free blocks and inodes.
fsck in Linux
fsck in this document is refered with reference to ufs file system but it can be used in Linux systems as
fsck -t ext2 /dev/sda3
it returns with any of the followig code
0 – No errors
1 – File system errors corrected
2 – System should be rebooted
4 – File system errors left uncorrected
8 – Operational error
16 – Usage or syntax error
32 – Fsck canceled by user request
128 – Shared library error
fsck checks the file systems defined in /etc/fstab in Linux and /etc/vfstab in Unix systems