Unix, Linux, DevOps , Cloud computing and BigData Knowledge-Base


3 Commands to operate on File fields

1.  cut Command ‘cut’ writes to standard output selected parts of each line of each input file, or standard input if no files are given or for a file name of ‘-‘. Synopsis: cut OPTION… [FILE]… In the table which follows, the BYTE-LIST, CHARACTER-LIST, and FIELD-LIST...


Working with kpartx Command in Red Hat Enterprise Linux

This tool, derived from util-linux’ partx, reads partition tables on specified device and create device maps over partitions segments detected. It is called from hotplug upon device maps creation and deletion. kpartx [-a | -d | -l] [-v] wholedisk Usage Example To mount all the partitions...


Working with mdadm Command in RHEL7

Introduction RAID devices are virtual devices created from two or more real block devices. This allows multiple devices (typically disk drives or partitions thereof) to be combined into a single device to hold (for example) a single filesystem. Some RAID levels include redundancy and so can...

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