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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0
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1answer
236 views

Using pppd with a serial port?

I just need to send/receive a messages through a unix-socket with PPP. But at first I want to launch the pppd with an usual serial port to make sure I know how it works. As I see, if I bind a pppd to ...
0
votes
2answers
44 views

updating, upgrading debian linux server except a package

I was looking for a command line to update/upgrade my VPS with the exception of the web server software. I have Nginx v.1.4.7 on my VPS and don't want it to get updated/upgraded when I run any ...
2
votes
3answers
454 views

Is there a utility to read environment variables from an env file and then run a command (more lightweight than foreman)?

foreman can read .env files and set environment variables from the contents, and then run a program e.g. foreman run -e vars.env myprogram ...but it does a lot of other things (and is primarily ...
1
vote
1answer
815 views

What should the permissions be on for PostgreSQL /data files?

I installed Postgres 9.3 from the osX binary. When I attempted to restart using pg_ctl restart, I received the following error: $ pg_ctl restart pg_ctl: could not open PID file ...
3
votes
2answers
3k views

syslog ip ranges to specific files using `rsyslog`

I have many Cisco / JunOS routers and switches that send logs to my Debian server, which uses rsyslogd. How can I configure rsyslogd to send these router / switch logs to a specific file, based on ...
5
votes
7answers
9k views

Should I use a login banner and if so, what should it say?

Are interactive login banners worth having? The general consensus is that they are, but what should the banner say? Some things that are being considered (no particular order): ownership of the ...
2
votes
4answers
6k views

How do I install the latest version of Sphinx Seach in Apt-get?

When I do "sudo apt-get install sphinxsearch", I get version 0.9. I want the latest stable version (which is 2.4, I believe) How can I do that using aptitude?
10
votes
2answers
7k views

Better logging for cronjobs? Send cron output to syslog?

I am looking for a better way to log cronjobs. Most cronjobs tend to spam email or the console, get ignored, or create yet another logfile. In this case, I have a Nagios NSCA script which sends data ...
0
votes
1answer
85 views

Nginx possible bug with dashes (-) in server_name

The following Nginx (v 1.2.1) configuration server { listen 80; server_name aaa.example.com; root /var/www/aaa; } server { listen 80; server_name hello-world.example.com; ...
7
votes
4answers
3k views

Specify default group and permissions for new files in a certain directory

I have a certain directory in which there is a project shared by multiple users. These users use SSH to gain access to this directory and modify/create files. This project should only be writeable to ...
3
votes
2answers
1k views

Why would chmod give “No such file or directory” when running recursively?

I can change the permissions of the file directly: # chmod --changes --recursive ug+rwX /var/www/shared/tmp/cache/assets/BA0/280/sprockets%2F286302903364106648b609d708884f78 and I can also ...
15
votes
1answer
9k views

rsync - Exclude files that are over a certain size?

I am doing a backup of my desktop to a remote machine. I'm basically doing rsync -a ~ example.com:backup/ However there are loads of large files, e.g. wikipedia dumps etc. Most of the files I care a ...
0
votes
0answers
100 views

*NIX devices getting Permission Denied errors after downloading ~4/5MB of data on FreeNAS CIFS share

I have my FreeNAS (FreeNAS-9.2.0-RELEASE-x64 (ab098f4)) which is set to rwx for my FreeNAS user and can be anonymously accessed through my network. When copying stuff from my windows host I get no ...
1
vote
1answer
49 views

Changing default ownership for files created by a user

I gave user "jdoe" access to SCP files onto a Unix server hosting Wordpress. Files this user creates within the /var/www/Wordpress folder (and subfolders) need to be owned by www-data or at least the ...
0
votes
3answers
508 views

“Silent” Backgrounding a Process

I have added a git pull & to my bashrc to keep a particular project always up to date! However this means every time I open a terminal I get a message like [17]+ Running git pull And a few ...
25
votes
7answers
45k views

How to get e-mail from (failed) cron-jobs in Ubuntu?

I create cron-jobs in Ubuntu by placing the executable in one of /etc/cron.{daily,hourly,monthly,weekly}. There are lots of directories starting with cron: kent@rat:~$ ls -ld /etc/cron* drwxr-xr-x 2 ...
5
votes
2answers
630 views

Copy directory tree without empty directories?

I have the following tree # upper letters = directory # lower letters = files A |-- B |-- C |-- D |-- e <= file |-- F |-- G I need to copy this tree to another destination, ...
1
vote
1answer
681 views

readlink: illegal option — f

Recently the script was working fine, but from some days I'm receiving such message, while running the readlink -f "$0" command: readlink: illegal option -- f usage: readlink [-n] [file ...] I was ...
1
vote
1answer
51 views

curl is giving wrong result via ssh

Curl is working fine on the node itself: [ec2-user@smokebase1 ~]$ curl -s -I --retry 3 --header 'Host: smoke-base.dev-test.com' ...
2
votes
2answers
111 views

how to configure firewall with “psad” utility to avoid port scan

I am trying to configure psad to stop port scanning and other attacks. Currently I have following rules set for my firewall which drops all incoming connection except port 22,80,443 and 3306. -A ...
0
votes
2answers
67 views

keep in tar.bz2 original directory datetime

I'm looking for a solution to create a tar.bz2 file and keep the original folder timestamp. My solution is "touch -t {original timestamp}" file.tar.bz2 manuel@mfpanzuela:~$ ls -la drwxrwxr-x 2 ...
3
votes
2answers
617 views

How to tell the difference between “No such file or directory” and “Permission Denied”

I'd rather not parse STDERR, but I can't think of another way to tell the difference, programmatically, between the two: $ ls /net/foo.example.com/bar/test /net/foo.example.com/bar/test: Permission ...
2
votes
0answers
243 views

Solaris 9: Degraded mirror unmanageable with raidctl after drive replacement

We have a pair of Sunfire v20z's (WITH LSI MPT raid) that have each had one drive in their mirrors die. bash-2.05# cat /etc/release Solaris 9 4/04 s9x_u6wos_08a x86 ...
1
vote
0answers
36 views

Redhat quitting process never works always have to kill it

I am working on a RedHat server creating a unicorn process. I have two sets of these processes being created. I am able to QUIT one of the process fine and do so over and over again create it and QUIT ...
7
votes
4answers
2k views

Where should I place group shared files on a Linux system?

I'm migrating a lot of small custom scripts and data from a Linux system to another. On the old system we had a shared user that owned most of the files and they where located in that users /home, ...
0
votes
1answer
48 views

OSAS v4 Open Systems Accounting Software [closed]

My company recently purchased another company and along with it, came an old SCO Openserver (v5) running OSAS v4. We use TinyTerm as recommended to access this but no one knows how to use it. I've ...
1
vote
6answers
490 views

Is a Unix flavour (i.e. Solaris) any good for a VPS web server?

Lets just say I am a fanatic to using something such as this, and would be willing to purchase the appropriate licenses (or open version of Solaris maybe) and install it. My questions are, do ...
4
votes
4answers
1k views

Bash script is not working as cron job

I have the following shell script $cat capture.sh TIME=$(date +"%H-%M-%d-%m-%y") IP="203.208.198.29" PREFIX=$TIME$IP tshark -f "udp" -i eth0 -w /root/captures/$PREFIX.cap& pid=$! sleep 2m ...
0
votes
1answer
342 views

Unable to clear sendmail mqueue-client

drwxr-xr-x 2 smmsp smmsp 4.0K May 6 23:31 mqueue drwxrws--- 2 smmsp smmsp 29M May 8 10:40 mqueue-client As you can see mqueue-client is filled with 29 megabytes of unsent mail. This seems to ...
10
votes
2answers
4k views

Making libmagic/file detect .docx files

As seen elsewhere, docx, xlsx and pttx are ZIPs. When uploading them to my web application, file (via libmagic andpython-magic) detects them as being ZIP. I store the contents of the file as a blob ...
2
votes
3answers
25k views

Most simple way of extracting substring in Unix shell?

What's the most simple way to extract substring on Unix shell (with regex)? Simple means: less feature less options less study Update I realized regex itself is conflicting with simplicity, and ...
-4
votes
1answer
77 views

Server that transfers FTP to FTPS without downloading on my PC [closed]

I need to do a server to server transfer, and the data is about 1 TB in size. One server supports plain FTP, but the other mandates FTPS. Both servers are located in the US. If the data was within a ...
1
vote
1answer
67 views

How to change protected config files via web/php interface?

I'm looking for way to modify configuration file that resides below /etc directory via web (in particular case PHP) interface. While it's not a problem to read (if you set up file permissions ...
0
votes
2answers
49 views

If a web root directory has a simlink that points to a folder one-level up, does that pose a security risk?

Assuming a Linux/Unix system. Not asking about any particular server software, just wondering in general. I want to use this to include javascript libraries or things like that in multiple sites or ...
-1
votes
2answers
73 views

Security in users having sudo access

How to protect my passwords list (in different databases for example) in a UNIX environment where most of the users have sudo access to other user IDs? I have a script (main.sh) with the following ...
8
votes
5answers
19k views

How to get pid of just started process

I want to start process (eg. myCommand) and get its pid (to allow to kill it later). I tried ps and filter by name, but I can not distinguish process by names myCommand ps ux | awk ...
0
votes
1answer
67 views

Give user permission to create/delete particular file?

Is it possible to give a user permission to create/delete a file at a certain path, but not to modify other files in the same directory?. I'm using Ansible to provision a CentOS 6.4 box. I'd like to ...
29
votes
4answers
26k views

How to convert text file from Windows line breaks to Unix ones on Unix/Linux?

Is there a quick way to convert text file from Unix line breaks to Windows ones in Unix environment? I thought there could be a standard utility.
2
votes
1answer
255 views

Create a link to the Unix socket [duplicate]

Is there a possibility to create a hard link for an unix socket? I'm creating a jail and symbolic links won't work, so I'm looking for a solution, how to provide an unix socket inside chrootted ...
22
votes
8answers
13k views

Is there a way to redirect output to a file without buffering on unix/linux?

I have a long running batch process that outputs some debug and process information to stdout. If I just run from a terminal I can keep track of 'where it is' but then the data gets too much and ...
2
votes
3answers
150 views

How do i change the global login shell on a unix system?

I want to set the login shell (the shell they get when they log in) of all existing and future users. The correct way to change the login shell seems to be chsh. But this only allows me to change the ...
2
votes
3answers
347 views

ssh but keep current working directory

I often want to ssh into a different server, but retain my working directory. (All our servers have the same NFS and thus the same directory path usually exists on all servers.) Is it possible to do ...
0
votes
2answers
969 views

Environment variables are unavailable when running scripts over ssh

Suppose I have two hosts: A and B with users a and b. B is Windows machine with Cygwin installed, if this matters. B is configured to be accessed from A through SSH without password (it contains A's ...
1
vote
2answers
788 views

I can run a script locally, but cannot do “ssh HOSTNAME /path/to/script.sh”

I have a linux server, and a linux desktop. I have written the following simple script to dump the database of a django web application: #! /bin/bash set -o errexit cd $(dirname $0) . ...
2
votes
1answer
144 views

How can I make my own linux distro? [closed]

My question is bit off-topic or may be impractical. The thing is, on the web too many material available to download customized linux distro. But what if I want to make my own linux distro ? ...
2
votes
3answers
6k views

How can I schedule a cron job that runs every 10 seconds in linux?

I know how to do every minute, but how about every 10 seconds?
7
votes
4answers
4k views

How big (in bits) is a Unix UID?

I understand that unix user IDs (UIDs) are usually 16 or 32 bit unsigned integers but how can I find out for any given system (in a shell)?
4
votes
1answer
797 views

Can i call pushd/popd and prevent it printing the stack?

After calling pushd/popd in bash, it will print off the current directory stack. Is there any way to prevent this behaviour, so that it will act 'quitely'? This sort of noise in a command is uncommon ...
0
votes
0answers
21 views

Process identifier mask in z/OS

I've noticed a curious pattern to process identifier numbers on the z/OS system I'm working on (uname reports it as OS/390), they're either 1-4 digits long or 8 digits long but never in between. The ...
6
votes
3answers
3k views

Directory that a user can read, but root can't?

There's a directory underneath my homedir called ".gvfs". As my regular user account, I can read it just fine: ~ $ ls -lart ~raldi/.gvfs total 4 dr-x------ 2 raldi raldi 0 2009-05-25 22:17 . ...