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Cannot make directory ‘/var/run/screen/S-apache’: Permission denied
ByEric MaHello! Im trying to create a screen folder for the user apache, Not root. But it seems to fail, I have no idea on how to fix this issue. I only get the error: Cannot make directory ‘/var/run/screen/S-apache’: Permission denied Im using Cent OS 7 There may be various possible reasons. 2 common reasons: screen…
How to get the directory path and file name from a absolute path in Bash on Linux?
ByEric MaHow to get the directory path and file name from a absolute path in Bash on Linux? For example, with “/foo/bar/baz.txt”, it will produce: “/foo/bar/” and “baz.txt”. You also have the basename and dirname commands besides of the basename and dirname C API in Linux: [zma@laptop:~]$ p=”/foo/bar/baz.txt” [zma@laptop:~]$ dirname $p /foo/bar [zma@laptop:~]$ basename $p baz.txt…
A Simple Sort Benchmark on Hadoop
ByEric MaAfter [[hadoop-installation-tutorial|installing Hadoop]], we usually run some benchmark programs to test whether the system works well. In the post of the Hadoop install tutorial, we show a very simple to grep strings from a simple sets of files. In this post, we introduce the Sort for testing and benchmarking Hadoop. The Sort program is also…
How to make “tree” output consistent on Linux
ByEric MaI tried tree on different Linux boxes to verify the files by diff. However, I found the format can be a little bit different on different nodes. For examples, the tree result could be . |– test2 | |– test4 | `– test5 `– test3 1 directory, 3 files or . ├── test2 │ ├──…
How to make Alt-Tab switch among windows instead of applications in Gnome 3?
ByEric MaThe default Alt-Tab in Gnome 3 switches among applications and windows are grouped by application. How to make Alt-Tab switch among windows instead of applications in Gnome 3? Check the Alternate Tab Gnome 3 extension and you will love it. Substitute Alt-Tab with a window based switcher that does not group by application. This extension…
Problems during Installing Xen Dom0 in Fedora
ByEric MaHere is a list of problem that may occur during installing and configuring Xen Dom0 in Fedora. It is found originally in Fedora systems, but the tips in this post should also be helpful for installing Xen Dom0 on other platforms. BIOS configuration If xen stops at: “I/O virtualization disabled.” We may need to enable…