Unix & Linux Weekly Newsletter - Tuesday, April 28, 2015

Top new questions this week: ./configure: What is an insane build environment? ./configure always checks whether the build environment is sane... I can't help but wonder what exactly a insane build environment is. What errors can this check raise? / compiling / configure   asked by sikerbela 28 votes answered by Gilles 25 votes What happens when you 'mount over' an existing folder with contents? Right now /tmp has some temporary files in it. When I mount my hard drive (/dev/sdc1) on top of /tmp, I can see the files on the hard drive. What happens to the actual content of /tmp when my hard ... / mount / tmp   asked by ams 25 votes answered by Mat 41 votes What's the point in redirecting output of grep to /dev/null? Consider this line: ${libdir}/bin/licenseTool check "${SERIAL}" "${VERSION}" "${PRODUCT}" ${libdir} | grep '^200' >/dev/null What's the point of looking for the pattern in the output if the ... / shell-script / grep   asked by JDługosz 19 votes answered by Janis 23 votes How does Linux determine what facilities to use to run a (non-text) binary? I understand that Linux uses shebang line to determine what interpreter to use for scripting languages, but how does it work for binaries? I mean I can run Linux binaries, and having installed both ... / linux / executable / wine / mono / .net   asked by golem 18 votes answered by Celada 23 votes How can I find the common name for a particular glyph? Sometimes, I'd like to know the name of a glyph. For example, if I see −, I may want to know if it's a hyphen -, an en-dash –, an em-dash —, or a minus symbol −. Is there a way that I can copy-paste ... / terminal / special-characters   asked by Sparhawk 17 votes answered by Stéphane Chazelas 22 votes Why does exporting vim as EDITOR in zsh disable keyboard shortcuts? My .zshrc looks like this: export EDITOR="/usr/bin/vim" Now when I open a terminal and enter a keyboard shortcut like ctrla to go to the beginning of the line, it doesn't work. Instead, the string ... / vim / zsh / keyboard-shortcuts / environment-variables   asked by zenith 16 votes answered by Stéphane Chazelas 18 votes /bin/dash: check whether $1 is a number What would be the best way to check whether $1 is an integer in /bin/dash ? In bash, I could do: [[ $1 =~ ^([0-9]+)$ ]] But that does not seem to be POSIX compliant and dash does not support that / shell / regular-expression / string / dash   asked by Martin Vegter 13 votes answered by John1024 9 votes Greatest hits from previous weeks: Gnome Shell Integration in Chrome not working Just upgraded to Ubuntu 14.04, which seems to also make a full reinstall of Chromium (as all my plugins were removed). Now, trying to access https://extensions.gnome.org/ to enable Gnome Shell ... / chrome / gnome-shell   asked by bak202 38 votes answered by Braiam 37 votes Uploading directories with sftp? I'm having some trouble uploading directories(which contain other directories a few levels deep) by sftp. I realize I could work around this by gzipping, but I don't see why that's necessary. Anyway, ... / linux / ssh / sftp   asked by Earlz 30 votes answered by Jander 6 votes Can you answer these? TCP Westwood implementation available? Is there a way to install TCP Westwood congestion control algorithm module for FreeBSD? If not, maybe there's a source code available that could be compiled into a loadable Kernel module? Thank you ... / freebsd / tcp   asked by KarlisL 3 votes Xen libvirt access for non-root user I've installed Xen and libvirt on a CentOS 6.6 machine. All the tools (virt-manager, virsh etc) work perfectly as root (directly or via sudo) but I cannot allow another user to connect (failed to ... / xen / dbus / libvirtd / policykit   asked by Dave C 2 votes How do I permanently change the console TTY font type so it holds after reboot? I'm running Ubuntu 15.04 64-bit Desktop Edition (A Debian based Linux). I used sudo dpkg-reconfigure console-setup from the command line to change the default console font type to Terminus. ... / command-line / console / tty / fonts   asked by codemagician 3 votes

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