Unix is a multitasking, multi-user computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs.

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How does UNIX know which private key to look for?

I have a public/private key pair. I put the contents of my public key into my server's .ssh/authorized_keys file. When I SSH into it, it automatically recognizes my key and lets me in. However, if I ...
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6 views

Logging in to putty by sesu as superuser and running commands

I need to automate using a bat file where I need the following things to be done: log in to server using putty/plink sesu to super user run certain commands get the outpout in a text file I can ...
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2answers
23 views

Unable to SSH, cannot create /dev/null/.ssh

I am trying to deploy hadoop with a master and slave node. But the master fails to start tasttracker and datanode processes in slaves, as it is not able to ssh into slaves. The error message is 'Could ...
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0answers
34 views

Allow user to traverse path to given directory

Say, I want to give a user colleague read access to a directory /rather/long/path/to/the/directory, but not necessarily to its parent directories. As explained for example here and there, I first ...
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1answer
14 views

Sudo Mv Renaming Mess Up

Okay, first things first Mac OS Mavericks MacBook Pro. Now, I used sudo mv to rename my Desktop and user folder. NOT the folder actually called user, but my user within that (it was neomartinson). ...
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1answer
20 views

Keep only latest two folders in the directory

I have a directory which has the following folders. Data-2014-07-10-0240 Data-2014-07-10-0340 Data-2014-07-11-1232 Data-2014-07-12-0530 Data-2014-07-13-1210 I want to keep only latest two folders ...
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0answers
25 views

sed, insert file before last line

The following inserting file method for sed used to be working, even before last line, but not any more. Is it a bug in the current sed? Demo of inserting file method with sed: mkdir /tmp/test ...
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1answer
59 views

All steps to set up and resolve subdomain.localhost to 127.0.0.1?

I suddenly feel stubborn about my subdomain on localhost not working. My /etc/hosts file looks like this: 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost fe80::1%lo0 ...
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1answer
31 views

Can I restore a Unix server by copypasting system directories from a backup?

I messed up a Ubuntu server with lots of installed binaries, settings, etc. I'm going to have to reinstall Ubuntu, but I have a complete backup, hidden files and all, though not bootable. I'm hoping ...
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30 views

Can't build using MacPorts in OS X

I've submitted a ticket here, but I am pretty pessimistic it'll be addressed. As I say, there, I'm running MacPorts 2.3.1 on OS X 10.9.3. In trying to install llvm-3.2, I get the following error: ...
3
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1answer
22 views

Using pv(1) to limit rsync speed

I'm trying to use pv rather than rsync's builtin --bwlimit to limit the bandwidth of an rsync transfer because --bwlimit is implemented in an eventually-consistent way, and my transfers are so short ...
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1answer
13 views

Escape brackets when using SED

I would like to replace the value varchar(36) with char(36) in a file by using sed. I am trying with sed -i ’s/varchar(36)/char(6)/g’ calls_contacts.sql But the command does not execute. What am I ...
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0answers
8 views

How to query mssql db from bash on subsystem for unix

I have a script that is used to query a database and use the result set for further processing. This is a shell script that runs on bash. But the bash used is the one shipped in subsystem for Unix for ...
2
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1answer
12 views

df -h Size - User != Avail

When I run df -h I get the following Filesystem Size Used Avail Use% Mounted on /dev/sda3 809G 753G 14G 99% / But Size - Used is not even close to Avail (809-753 = 56 ...
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1answer
11 views

tmux: close session while open

I am using tmux to manage multiple terminal windows. Currently I have 2 windows open with multiple panes. How can I close the session from inside of tmux. I know that I have to use the prefix (for me ...
1
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1answer
14 views

Binary file on Linux machine looking for libraries in /lib by default

On my UNIX machine I observed that the binaries are looking for the dependent shared libraries in '/lib' directory by default even though the '/lib' directory is not configured in 'PATH' and ...
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1answer
16 views

Switch from ZSH to default OS X

http://stackoverflow.com/questions/13476232/make-iterm2-launch-with-zsh I used chsh -s /bin/zsh as described above to set zsh as default. I'd like to switch back to default standard terminal that ...
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2answers
29 views

Mac addresses of devices on network

I'm on OSX Mavericks. I'm connected via wifi to my network. How can I find the mac addresses of all other devices on the network?
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8 views

Fail all login attempts from an IP address or IP range [duplicate]

I am noticing a large number of failed login attempts from a range of IP addresses (starting with 117.) How can I automatically fail all login attempts from this range?
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6 views

Homebrew App Not Using Python Package

I installed duply using Homebrew and tried to create a backup to Google Drive. Doing so results in the following error: BackendException: Google Docs backend requires Google Data APIs Python ...
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0answers
11 views

How can I browse through Homebrew's formulae according to popularity (# downloads all time)?

Though I can easily find an alphabetical list of all available formulae, there seems to be no resource online, including at Brew's Github, or seemingly anywhere where I'm able to browse through ...
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3answers
40 views

Is there anything grep does better than ack? [closed]

I started using ack a while ago and it's amazing, but still begs the question: Is there anything grep still does better than ack? Or maybe is there something grep does that ack can't do?
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23 views

How to install Haskell platform on Kali Linux?

I'm new to Linux and I want to install Haskell platform on my Kali Linux system, but unfortunately I can't do it alone.So I really need your help. Also, if possible explain me how to do it step by ...
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1answer
25 views

Is GNU Hurd using the same principles as Minix 3 for self healing?

Minix3 has a reincarnation server that can restart drivers if they crash or end up in a infinitive loop. It can even restart the disk driver by keeping a shadow copy of the same or an older version of ...
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1answer
20 views

realpath (GNU coreutils 8.22) does resolve “.” symlink regardless of “-s”

I'm trying to use realpath in a script which has to ensure that it is located under a certain (possibly symlinked) path. Also the script has to be runnable from any location, so it cannot presume that ...
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2answers
34 views

Jump in vim on same line

I have log files of format 'date' 'filename' 'something 'return status' Often status goes beyond my screen. While I am reading 'something' I press End to see status and Home to see filename. But ...
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18 views

alternative for find_task_by_pid() [migrated]

I need to access task with given pid in my syscall. Apparently function find_task_by_pid() was serving this purpose in older versions of Linux kernel. It seems like only function to search for task ...
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2answers
53 views

Does Windows still copy each file directly to disk, unlike Unix?

Unix was originally designed to perform file system operations in memory, and to update the disk blocks only every 30 seconds during sync. This resulted in a much faster user experience than MSDOS ...
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454 views

Unix: “ls” command shows files with ? after the extension [migrated]

I have written a shell script (test.sh) using Java. This shell script actually does a copy job from one file to the other. After the execution of the shell script I have opened the directory from ...
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1answer
13 views

how do I display a chapter in the man?

use the man command to find a command to determine a file type. The man command with the -k keyword option will display all commands. I want you to display only commands in chapter 1 of the Unix man ...
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2answers
21 views

“Less” prompts for “binary file” display when colors in output

We've recently enabled colouring the log files of a few services, I believe we use ANSI escape sequences for that. Looks like this: [2014-06-12 10:56:43,214] [main] [VOID] ESC[34mINFO ESC[0;39m ...
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1answer
21 views

How to get tree -a to ignore .git directories?

I love using tree to list directories, and I have a git repository with all my dotfiles. For me to be able to see them I need to do tree -a, but that will also list the contents inside the .git ...
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1answer
18 views

sql query not working in unix shell script

I am using shell variable in sql statement and that variable is string type.If I execute the below script I am getting output as 'no rows selected' but when I execute same select query in sql prompt ...
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2answers
28 views

using url with Putty to access Unix server

I need to access UNIX server from my windows machine and will be using PUTTY. Can I access the UNIX server with the url rather than direct IP address? I am getting error that host cannot be found ...
0
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1answer
18 views

how to get the status of commands executed inside ssh connection

I have an ssh connection where I am running 2 commands. I want to know the status of each command after execution. the code is like below: ssh $username@$server -t <<'XXX' command 1 command ...
0
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1answer
14 views

Move child folders into a different folder

I am new to UNIX, and I am trying to write a shell script that would move all folders that are older than a day in log archive directory into another folder. Below is the command I am using for doing ...
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1answer
5 views

less -S server.log (unix)

For a better understanding I prefer to read the logs with no wrap lines. In less I can get this with the -S option. The problem is that I can not select and copy rows that go beyond the right side ...
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2answers
16 views

batch rename multiple mp3's stripping leading digits

Hi could anyone help me? Im trying to strip leading digits from multiple mp3 files so "01 some_file.mp3" would become "some_file.mp3" if any one could show me how to doit with zmv that would be great
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1answer
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Unix mail command: Sort by newest first

When I use the "mail" command, it prints a list of messages in my inbox in a format like this: 1 Super User Mon Jun 9 17:13 86/4716 Complete Registration With Stack Exchange However I've ...
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If we have a collection of Linux computers on a LAN, how to write shell script to shutdown all computer [duplicate]

I have lab and in that ,collection of Linux computer are connected in LAN. i want how to writ e shell script to shut down all PC when we run that shell script.
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7 views

How can I activate the Front Panel in CDE?

We installed a new Solaris work station at work and most of them come with the Front Panel, however the latest did not. How can I activate it?
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2answers
32 views

Is there a unix command to output time elapsed during a command?

I love using time to find out how long a command took to execute but when dealing with commands that execute sub-commands internally (and provide output that allows you to tell when each of those ...
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2answers
149 views

Can files be recovered after a failed mv command?

I used mv * .. in Unix to move all contents of a directory to its parent folder. There was a folder called "Downloads" in both the current directory and the parent. The one in the parent was empty to ...
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21 views

Solaris - Inheriting by files the user's ownership of directory

I have a directory with ownersip like user:group. I want to make on it something like suid on group, but for user - all of new created files have a directory ownership. For example: drwxrwx--- 2 user ...
1
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1answer
23 views

Can I create a “symlink-esque” file to “merge” two files together?

I'm dealing with an application that reads a config file, config.yml, from the current directory. This config file contains both secret information (API keys) that shouldn't be checked in to source ...
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2answers
68 views

Is it better to check if file exists before deleting it

Sometimes when I want to delete a file (from within a script), I will just delete it rather than checking if it exists first. So I do this: $ rm "temp.txt" 2>/dev/null Instead of this: [ -f ...
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1answer
46 views

Windows 8 cannot access samba while other OS do

I found some related topic, but they do not answer my problem or weren't enough accurate. I have a samba on a ArchLinux machine (a rapberry), which can be accessed from Android and iOS apps but not ...
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How to jump back to the first character in *nix command line?

When writing a long command in the *nix command line and having to go back to the first character, in order to add something at the beginning (for instance a nohup, when you realize the process will ...
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2answers
46 views

CURL used in shell

I am executing a shell script in which one curl command is present. I have to store the output of curl command(xml format) in a file and display the result on screen. For this to happen "tee command" ...
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1answer
58 views

Delete file if number in filename less than xxxx

I have thousands files in format randomstring_XXXXXXXX.jpg where 'xxx' is unixtime (1388415305). Now I need to delete all files older than some (unixtime) date. Does anyone have a solution for this?