Tagged Questions

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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56 views

ksh script using if break statements

I have a script file that has the server details like set -A SERVERGRPS SERVERS_CA SERVERS_NY set -A CA ca126 ca546 ca 642 set -A NY ny112 ny113 ny114 now I have to write a another script which ...
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1answer
30 views

Linux bash iterating and Break

I have two server groups SERVERS_CA AND SERVERS_NY. I will have a array something like SERVERGROUP=(CA NY) CA and NY will have set of servers in arrays like CA=(ca126 ca546 ca 642) NY=(ny112 ny113 ...
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1answer
104 views

Cannot change directory into home directory, although permissions are set correct

I guess I need some help from an advanced Unix user... On a Ubuntu System I did something stupid. I typed sudo chmod 774 .* or the like, in a subfolder of my home folder and then I suddenly could not ...
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1answer
66 views

Tar withour directory structure and exclude folders

I am trying to create a tar file to exclude certain folders and then I want to have a tar file without the parent directory structure. I am able to exclude folders, but when I extract I see path from ...
1
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1answer
420 views

boot2docker mount windows share

I am running boot2docker on windows and I am trying to access a shared folder on my host from the VM. I have executed the following sudo mkdir /mnt/docktest sudo mount -t cifs ...
2
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2answers
509 views

Copying folder from one Unix server to another, updating owners IDs

I'm using the method described here to copy a directory from one Unix server to another (both Ubuntu 14.04): rsync -aruv localfolder/ user@server:destination/ I need to keep the same owners and ...
0
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1answer
97 views

How can I get more information from Curl regarding a FTP 425 “Cannot open data connection” error?

I am trying to upload a file with the following line: curl -3 --ftp-pasv --ftp-ssl-control -v -i -T ./mybigfile.gz ftp://lawrence@mecloud.xxxxxxx.co.uk:21/OnlineBackup/Lawrence/ --insecure -u ...
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0answers
34 views

Unix Multi-Group Permissions

I am trying to do permissions to a folder for multiple groups, each will have different permissions to the directory. Can you let me know how to do this without editing the ACL's? Group 1 RW Group 2 ...
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0answers
18 views

Message queue doesn't exists any more after reboot/shutdown of the virtual machine (Ubuntu)

I'm working on a simple multithread client/server program in C using native message queue of unix to send messages from one client to another. It works fine, but my problem is that after a reboot or ...
0
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1answer
57 views

Memory usage of a process in a shell script

I want to find out the memory usage of a process in a shell script.I tried to use this piece of code : while[process] do if [ -e /proc/$pidno/statm ]; then m=`awk '{OFS="\t";print ...
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0answers
17 views

UNIX command tcpdump for certain filetypes like xml

I use the unix command tcpdump with these extensions -A -s0 -ien0 port 80 I know how to add, for example a new host, that would be and \ host random.com Can i sniff for certain filetypes? I have ...
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3answers
303 views

Creating a large file of random bytes quickly

I want to create a large file ~10G filled with zeros and random values. I have tried using: dd if=/dev/urandom of=10Gfile bs=5G count=10 it creates a file of about 2Gb and exits with a exit status ...
0
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1answer
32 views

What is the easiest way to convert a bunch of text files from LF (Unix) to CRLF (Windows) in a single run?

There is a directory tree on a Windows7 machine containing a few hundred text files that I want to convert from LF to CRLF. I already found a Win32 version of UNIX2DOS but that one accepts only one ...
0
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1answer
44 views

Iostat and top show static resource usage on first value

For one of my projects, I need to obtain resource (CPU, I/O and disk-space) usage programatically. Currently I'm running shell commands (iostat) and parsing the results which works relatively well ...
7
votes
1answer
291 views

Multiple unix pipes not working

This first pipeline works fine (printing "c"): echo "a" | sed 's/a/b/' | sed 's/b/c/' This one does not do what I expect (nothing gets printed when I feed an "a" into my fifo ): mkfifo fifo; cat ...
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0answers
48 views

Why isn't the loop back interface replying to injected ICMP echo request?

I want to be able to send IP packets from a userspace program and receive responses on a TUN interface. To test, I'm injecting ICMP icho requests to the loopback interface from a user space ...
0
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1answer
65 views

Unix BIOS/Boot Record on USB Flash Drive

I have been trying to learn a bit more about USB drives, and am curious about their MBRs. Essentially, I open up the device file of the USB drive and give a hex dump of the first 496 bytes of the ...
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2answers
54 views

Delete Directories that Contain Specified File in Mac OS X

How do I delete a folder that contains a file or folder with a specific name? E.g. I want to delete all folders that contain the file "things.txt": /dirA/ /dirB/things.txt /dirC/ /dirD/things.txt ...
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0answers
69 views

Using Tap/Tun to intercept packets at IP level

I am working on a research project involving ARP poisoning. I would like to intercept packets on the IP level. If my machine receives a packet with an IP address not destined to it's own IP ...
66
votes
6answers
4k views

Choosing between .bashrc, .profile, .bash_profile, etc [duplicate]

This is embarrassing, but after many years of using POSIX systems full time, I still have a hard time figuring out if a shell customization should go in .bashrc, .profile, or somewhere else. Not to ...
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2answers
81 views

How do I delay tcp traffic on a socket?

I would like to test the interactions between a client program and a server program for race conditions. They connect to each other via tcp. The client does blocking calls to the server on multiple ...
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0answers
48 views

0711-317 ERROR: Undefined symbol

I am installing a C package named expat-2.1.0 in AIX 6.1 machine. While performing a gmake it popping the below output. /bin/sh ./libtool --silent --mode=compile gcc -std=gnu99 -I./lib -I. -g -O2 ...
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vote
1answer
56 views

how to create ubuntu installable iso image from files

this might be a quite silly question but I lack linux knowlege so here it is... I have an ubuntu VPS from which I need to create a development environment under my WMWare. So I wonder if the ...
0
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2answers
71 views

How to ignore a specific SMART error

I get an email about the same SMART error every day. I'd like to configure the SMART daemon to ignore this specific error, but only this, since I still want to now if anything changes or gets worse. ...
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0answers
26 views

How to get the status of VGA device

Currently I am using vga2usb device for capturing output from the virtually any VGA source such as tab or any another monitor. If I connect this vga2usb device to my Ubuntu machine then we are ...
3
votes
3answers
71 views

Sed replace only in even numbered lines of a file when replace commands are written in a file

I have all the replace commands in a file (say replace.sed) and i use it with -f flag of sed (sed -f replace.sed InputFile). But now i ran into a condition where i need to apply these replace rules ...
2
votes
1answer
278 views

wc / cat command not found

I'm trying to run some simple bash script which uses wc and cat commands. The script fails with this: wc: command not found or this (after I commented string which uses wc): cat: command not found ...
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0answers
136 views

Configuring Apache with PHP-FPM, Apache failed to start

I followed this guide to configure PHP-FPM with Apache on my server but after I restart Apache successfully: [root@localhost vhost]# service httpd restart Stopping httpd: ...
0
votes
1answer
90 views

tar -czvf with no output file

Say you run tar -czvf some_folder_here and don't actually specify an output file, like tar -czvf some_output_file.tar some_folder_here. Where does the file go? I just ran this by accident, and the ...
0
votes
1answer
110 views

Solaris 11.1 x86 installing Weblogic 12.11

Ive been looking everywhere for a way to install Weblogic on Solaris. According to Oracle's documentation, all you need to install Weblogic Graphical Mode is Login on Unix Go to the directory that ...
1
vote
2answers
46 views

Retrieve secure copy in UNIX?

Is there a way to retrieve a secure copy in UNIX? Why would I need to do this? Because I can login to a remote machine from my local machine, but not the other way around. So I need to retrieve a ...
-1
votes
1answer
39 views

how to retrieve following error when i execute shell script

I have one script to log into remote server.But i tried to Execute the script some error occur. Logs: My script: #!/bin/bash S1=$(ssh -t selvam-odc-shell1 "users | wc -w ") S2=$(ssh -t ...
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0answers
31 views

-t, -T and/or -t -t options for ssh are not stopping stty errors

I've googled this error (which is a pretty common error) ad nauseam, but none of the solutions are working. Disabling pseudo-tty allocation nor forcing pseudo-tty allocation work for me. I always ...
1
vote
1answer
28 views

NetBIOS replying only to external requests

I have some IPs on the internal network I'm 100% sure have netbios enabled. (I say "internal network", but all the IP octets differ. It is just the same institution and geographical location). If I ...
2
votes
1answer
28 views

create a doskey like ~ in unix

I'm writing a small little BAT file that has the ability to create doskey's (alias) like those in Unix. for example: doskey cat=type $* doskey ..=cd.. I just want these BAT files so I can put them ...
-1
votes
1answer
34 views

I'm not able to access my remote machine without password

I am working on Free BSD and I need to connect to my remote machine without password. I tried the following but I can't log into the remote machine without password. Logs: ssh-keygen -t rsa scp ...
0
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3answers
26 views

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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votes
1answer
195 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 ...
0
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2answers
171 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 ...
2
votes
1answer
94 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 ...
0
votes
1answer
35 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). ...
0
votes
1answer
47 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 ...
2
votes
1answer
292 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 ...
0
votes
1answer
721 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 ...
0
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1answer
42 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 ...
0
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0answers
103 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
votes
1answer
66 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 ...
0
votes
1answer
31 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 ...
0
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0answers
62 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
votes
1answer
19 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 ...