Unix & Linux Weekly Newsletter - Tuesday, December 30, 2014

Top new questions this week: What is the /boot partition really for? I'm reading a relatively old text on Linux partitions and file systems (the LPIC 1 Certification Bible). It says: Some versions of the Linux boot loaders cannot access a kernel that is outside ... / partition / hard-disk / boot-loader / fhs   asked by HNML 14 votes answered by Graeme 18 votes Why do my identically prepared USB sticks differ in one byte? I have two identical USB sticks (TrekStor 16GB) prepared as following with the c't bankix image. Preparation using GParted: Deleted the existing partition Created a new DOS partition table ... / live-usb / troubleshooting   asked by student 14 votes answered by Jens 26 votes How to dump a binary file as a C/C++ string literal? I have a binary file I would like to include in my C source code (temporarily, for testing purposes) so I would like to obtain the file contents as a C string, something like this: \x01\x02\x03\x04 ... / c / hexdump / xxd   asked by Malvineous 12 votes answered by Michael Homer 22 votes How do I do an N-way diff? How do I diff the output of multiple commands? vimdiff can support up to four files, but diff itself seems to support exactly two files. Is it directly possible with some variant of diff, or do I ... / scripting / diff   asked by muru 9 votes answered by MariusMatutiae 7 votes How can I list all shell variables? Reading about this question: In zsh how can I list all the environment variables?, I wondered, how can I list all the shell variables? Also, does the distinction between shell variables and ... / shell / zsh / environment-variables   asked by Josh 8 votes answered by Uriel 4 votes Can I make a file only accessible to a script, and not a user? I have a user with limited access on the system (that is, he is not a sudoer); let's call him Bob. I have a script or a binary which I, the system administrator, trust, and would have no problems ... / permissions / root / access-control   asked by IQAndreas 7 votes answered by Benjamin Pollack 9 votes Cannot run cryptsetup throught SSH? I'm trying to open a LUKS drive through SSH directly. ssh root@XX "cryptsetup luksOpen /dev/sdb3 secure But, no password prompt and it stuck. debug1: Sending command: cryptsetup luksOpen /dev/sdb3 ... / ssh / luks   asked by warl0ck 6 votes answered by frostschutz 7 votes Greatest hits from previous weeks: How do I remove a user from a group? Which command should I use to remove a user from a group in Debian? When adding a user to a group, it can be done with: usermod -a -G group user However, I could not find a similar command ... / users / group   asked by Lekensteyn 76 votes answered by Herman Torjussen 81 votes Why am I still getting a password prompt with ssh with public key authentication? I'm working from the URL I found here: http://jaybyjayfresh.com/2009/02/04/logging-in-without-a-password-certificates-ssh/ My ssh client is Ubuntu 64 bit 11.10 desktop and my server is Centos 6.2 64 ... / ssh / key-authentication   asked by Thom 74 votes answered by Rob 101 votes Can you answer these? Protecting my server from it's own users Are there any tools to check my server's file system for permission vulnerabilities? My server is a low security web and email server running our local email and website. Anyone in my organization ... / permissions / vulnerability   asked by Michael Ozeryansky 2 votes Generate array of strings combined with number I would like to generate a local array in a shell/bash script that consists of the following elements: JF-1998, JF-1999, JF-2000,... , JF-2011. That is, a string JF- combined with the years from 1998 ... / shell-script / string / array   asked by MERose 2 votes Why is my SSH authentication socket different from the man pages? These two entries of man ssh-agent describe the SSH authentication socket: $TMPDIR/ssh-XXXXXXXXXX/agent.<ppid> UNIX-domain sockets used to contain the connection to the authentication ... / ubuntu / ssh / authentication / ssh-agent   asked by IQAndreas 3 votes

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