Unix & Linux Weekly Newsletter - Tuesday, December 29, 2015

Top new questions this week: Why does mount happen over an existing directory? An existing directory is needed as a mount point. $ ls $ sudo mount /dev/sdb2 ./datadisk mount: mount point ./datadisk does not exist $ mkdir datadisk $ sudo mount /dev/sdb2 ./datadisk $ I find it ... / mount   asked by Melebius 41 votes answered by pjc50 40 votes Should variables be quoted when executed? The general rule in shell scripting is that variables should always be quoted unless there is a compelling reason not to. For more details than you probably want to know, have a look at this great ... / shell-script / quoting / variable   asked by terdon 13 votes answered by muru 15 votes Why non-number record shows after "0" in sorting? I want to sort files according to the number in the filename. Here are the files: $ ls *.f 0.f 13.f 1.f 22.f 4.f abc.f The sorting result: $ ls *.f | sort -t. -k1n 0.f abc.f # note this file! ... / sort   asked by nn0p 8 votes answered by bahamat 10 votes sed in-place line deletion on full filesystem? Due to an application bug as yet undiagnosed, I have several hundred servers with a full disk. There is one file that has been filled up with duplicate lines—not a log file, but a user environment ... / text-processing / files / sed / ed   asked by Wildcard 8 votes answered by Barmar 6 votes Variable assignments affect present running shell While writing some code I found out that this line: $ TZ="America/Los_Angeles" date; echo "$TZ" Thu Dec 24 14:39:15 PST 2015 Correctly gives the actual time at "Los Angeles" and that the ... / shell / environment-variables / posix   asked by BinaryZebra 7 votes answered by mikeserv 6 votes Flatten the output of a recursive directory listing Is there a way to list out all the files within a directory tree in a single list, sorted by modification time on Linux? ls -Rlt lists out files recursively, but they are grouped under different ... / files / ls / recursive   asked by mahela007 6 votes answered by terdon 11 votes Why does [0-9]* match where there aren't any digits? so the command is : echo "abc 123" | sed "s/[0-9]*/h/g" and im getting output as hahbhch h how am i getting this output? the output i expected it to be is abc h which im getting by ... / sed / regular-expression   asked by sidharthanup 6 votes answered by Kira 18 votes Greatest hits from previous weeks: How to permanently set environmental variables My variables are LD_LIBRARY_PATH=/usr/lib/oracle/11.2/client64/lib ORACLE_HOME=/usr/lib/oracle/11.2/client64 How to save these variables permanently ? / environment-variables   asked by user3021349 53 votes answered by Kiwy 64 votes How to change hostname on CentOS 6.5? I can't seem to change the hostname on my CentOS 6.5 host. I am following the instructions I found here: http://www.rackspace.com/knowledge_center/article/centos-hostname-change I set my /etc/hosts ... / centos / hostname   asked by Red Cricket 20 votes answered by Networker 28 votes Can you answer these? Can Google Chrome run on ARM architecture? I am running Debian on an ARM device, is there any build of Google Chrome for that? / chrome   asked by Fiksdal 2 votes Can't exit i3 because no sensible terminal emulator is installed I am trying to setup Arch Linux, and after getting the most basic stuff setup I installed and ran i3 with: pacman -S i3 dmenu xorg xorg-xinit startx It finally started, but I can't exit it. After ... / arch-linux / terminal / i3   asked by vestlen 3 votes Lost space in LVM LVM Hey. First of all I want to say excuse me for my bad English. I a problem after installing CentOS 7 with LVM. Some space lost after problem with LVM configuration. I tried to add some logical ... / linux / centos / lvm   asked by Jeka Feigelman 2 votes

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