How to force a fsck after reboot?

For various reasons you may want to force a check (fsck) of a filesystem you currently use (most likely the root / filesystem as you cannot umount it on-the-go). To achieve that do: (below is for the / mount)     # touch /forcefsck and after the reboot you’ll see that the fsck is being done.

linux

How to Distinguish Environment Variables from Different Shells in “bash”?

Every instance of the command line shell (thus every process) on Unix (and hence Linux) has a different set of environment variables. Actually different shell instances you may have the same variable, but set to different values. If you are doing a system wide job and you are using shell scripting, you would like to…

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linux

Comparing and Measuring Performance of Linux Filesystems

There are various filesystems on Linux, some being cluster aware, some being taking care of data integrity and so on. I have been using tools below to measure and compare performance of each: bonnie dbench postmark iozone Hope that helps…

linux