A shell is terminology for a command-line interpreter most commonly used with Unix-like operating systems, but also used to interact with GUI-based operating systems in a more granular fashion. Not only does it allows the user to run programs from a text interface, but frequently offers basic ...

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2
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2answers
168 views

monitor a directory with a shell script

I'm looking for shell command like the kernel's inotify function. Is there a command that will monitor a directory, that could be used like this: while [ 1 ]; do name-of-monitor-program . ...
4
votes
2answers
132 views

Is there a good reason not to add sbin to the default PATH?

Background: The PATH environment variable specifies the directories to be searched through when a command is issued without specifying a path. "sbin" paths (/sbin, /usr/sbin) are intended to house ...
1
vote
0answers
72 views

Why Parent Class In a TC Rules Tree Not Working

The parent class in my TC rules script doesn't work as it garanteed! Can somebody tell me what is wrong with my script? Here are some details about my question: From the chapter "9.5.4.4. Sample ...
1
vote
1answer
178 views

How to prevent users from renaming files while providing write permissions on Linux [closed]

For some special purpose, I want to prevent non-root users of the Linux Server from changing/renaming the filenames. However, they can modify and write to the contents of the file. How to do this from ...
0
votes
2answers
105 views

What seems wrong with this bash script? [closed]

I found an initscript that for some reason insists on starting the specified application as the root user. I can't wrap my head around why it is doing this, any hints? The script runs on Redhat ...
1
vote
1answer
56 views

remote shell to and from server core. So I can “dir”

What are the prerequisites for \\serverNameOrServerAddress\C$ to work in Cmd? So I can catch a file for my firewall in server core.
1
vote
2answers
289 views

find: how to not have errors (stderr) when no files exists

I have a custom script which gzip log files when they are one day old. In my script all errors (stderr) are logged to a file and at the end of the script I use this file to know if its execution was ...
1
vote
2answers
449 views

Strange characters from output in shell

Over the past few years there have been some Linux systems that will output strange characters when running various commands. Here's an example of my output from the sensors command on one of those ...
1
vote
1answer
1k views

Can't stop mysql too many connections

running mysqladmin shotdown gives mysqladmin: connect to server at 'localhost' failed error: 'Too many connections' Can't find a solution to reboot mysql
3
votes
2answers
1k views

Shell script command output in if condition comparison fails to compare to same value string

I'm incorporating a script snippet which determines Android version via: adb shell getprop ro.build.version.release which returns: 4.1.2 or 4.0.4 The snippet currently looks like this: if [ "$(adb ...
0
votes
1answer
35 views

Running jobs in a HPC cluster [closed]

I'm quite new to HPC environment. Is there any difference in running a job on a node utilizing 8 cores and running the same job on 8 nodes utilizing I core in terms of performance or walltime used. ...
26
votes
3answers
2k views

Did a cat /dev/urandom - Broken terminal

Out of curiosity, when your shell character set breaks from doing something like cat /dev/urandom is there a way to fix that in place?
-1
votes
1answer
163 views

`pwd -P` preventing bash script from running in supervisord [closed]

I'm running supervisord to execute gunicorn. My problem is when my script contains CURR_DIR=`pwd -P` and run the script via supervisord, it STOPS the process. My script is located in /var/www/conf and ...
1
vote
2answers
95 views

enabling shell access for cyrus user

My current cyrus user in /etc/passwd looks like this: cyrus:x:76:12:Cyrus IMAP Server:/var/lib/imap:/sbin/nologin I want to be able to give it shell access but restrict it to /var/lib/imap and ...
1
vote
2answers
129 views

If I know the PID number of a process can I know its name?

If I have the PID number for a process (on a UNIX machine), how can I know the name of its associated process? What do I have to do?
15
votes
2answers
783 views

Bash Prompt Below Output - Background Log Tail

I used to work for a company who had a customised shell for management of one of their products that was running on Linux and I'm looking to replicate a key feature of this shell. All the work was ...
1
vote
1answer
182 views

Shell script error on filename with spaces

I have a bash script that search for every static file located under my server root and stores a gzipped version next to each file. I got it from ...
2
votes
2answers
219 views

How can I get an integer output on BSD ping?

I am trying to perform a simple check on an integer value output from ping. In Linux this was working quite nicely, but the FreeBSD ping outputs a float value with percentage sign suffixed. ...
-1
votes
3answers
60 views

What shell scripts have run [closed]

Is there any way to determine what shell scripts ran within a certain time frame? I.e. I need to know all the shell scripts that ran yesterday between 2:00 an 5:00.
0
votes
1answer
332 views

Cron job does not generate expected log file

I'm trying to execute a shell with crontab. The cron job executes the shell but doesn't generate the log file i need. This is what i'm using for my cron: 10 * * * * /home/user/3nvo.sh This is a ...
0
votes
1answer
51 views

Store pid of a forked process in a file

I have the following but I'm worried about $! being overwritten prior to the echo command taking place. How do you guys recommend going about this? sleep 100 & >/dev/null ; echo $! ...
5
votes
1answer
763 views

Are ulimits inherited by the shell, by the user, or a combination?

When a process spawns a subshell, how is the ulimit inherited? Is it by user, by shell, or a combination? Specifically, this was found in the context of HP Server Automation jobs failing on some ...
-2
votes
1answer
4k views

Cannot find a valid baseurl for any repo in centos 6.4

when I want to install any repo I found this error Error: Cannot find a valid baseurl for repo: rpmfusion-free I'm using centos 6.4 I tried to check other packages I found the same error ... so ...
3
votes
1answer
60 views

Is it possible to attach a shell to an existing ssh tunnel?

I have a few SSH tunnels setup for auto-connection/re-connection with Shimo. Is there a way of attaching shell access to those existing tunnels and how if so? Or will I have to establish a new ssh ...
3
votes
4answers
418 views

Bash one-liner that shows a running countdown until a DNS update (TTL expiration)

I find myself frequently tasked with updating DNS records and needing to know exactly when the refresh will begin (a.k.a TTL expiration). I came up with this bash one-liner that gives me the output I ...
0
votes
1answer
41 views

Sort the output of the “who” command

I'm trying to sort the output of the who command but I guess I'm kinda lost on this one. I want to sort it based on who just logged in. Thanks
-1
votes
2answers
187 views

Try the command multiple times [closed]

I need to execute a command and also check if it was successful. If there was an error, I should try again and the following code is working as expected. But what if I need to try the same command 3 ...
1
vote
1answer
1k views

could not stat config file “slapd.conf” to add entries to LDAP

I got a problem when I adding some entries in LDAP slapadd -l /etc/openldap/root.ldif -f slapd.conf -d 10 slapadd -l /etc/openldap/people.ldif -f slapd.conf -d 10 slapadd -l ...
0
votes
1answer
39 views

Protect against inadvertent command entry

I have a couple boxes in production and then some in a test environment. Anyone have any clever ways to protect against typing in inadvertent commands into boxes? i.e. I want to put a confirmation ...
-1
votes
2answers
2k views

Shell script :: Reading a column from file & store it in array [closed]

I am working on shell script where i want to store O/P of the command in array. I have a file containing rows & columns from where i want to extract 3rd column & store all values in a array. ...
2
votes
3answers
115 views

how to get [ current_path ] in shell bash prompt?

Is it possible to have the name of the current working directory in the prompt in shell ? Im working on OSX and CentOS in multiple projects under /srv/... and a mistake for wrong directory is quickly ...
-1
votes
3answers
105 views

grep command does not search the complete pattern [closed]

I am facing a problem while using the grep command in shell script. Actually, I have one file (PCF_STARHUB_20130625_1) which contains below records. ...
1
vote
1answer
76 views

Search log files newer than a time

I have a log file which has entries like below. I want to find only the log entries newer than a given time. What would be a suitable shell script for it? [2013-06-23 21:31:19,972] INFO [2013-06-23 ...
0
votes
1answer
317 views

Why is this cron job with shell script failing? [duplicate]

I created a cron job to do a daily backup, to store it in the directory /backups This backups directory is located at the root [/] of the VPS server and is a separate backups partition provided by ...
0
votes
1answer
297 views

automatically start and and selectively stop multiple instances of couchdb on osx

I have successfully installed couchdb via homebrew: % brew install couchdb ...and invoked mutiple instances as directed here: % OLD=/usr/local % NEW=/tmp/couchdb % mkdir -p $NEW/etc/couchdb/ % ...
2
votes
1answer
141 views

How do I find the biggest files on multiple servers and sum up their size?

I am trying to find the biggest files in the /export/home directory and add up (sum) their sizes. Script: #!/bin/bash filename=hostnames > export_home.log while read -r -a line do ...
2
votes
2answers
89 views

Are passwords sent via a bash script retrievable?

As part of running a backup script for a linux server, I have commands like mysqldump within a bash script which contain the mysql root password, and certain ftp server passwords. Are these ...
2
votes
2answers
450 views

Is there a shell to change password when connecting over SSH?

This is a pretty odd question, but I'd like my users to be able to change their passwords for my FTPS server, which is using local accounts. Currently all these users have /bin/false set as shell, but ...
2
votes
1answer
1k views

Linux- Permission denied?

I'm installing Neo4j server as a linux service, but when I install it, I get the following message: /sbin/insserv: Permission denied What is this? What should I do? I'm running everything with ...
0
votes
4answers
2k views

The opposite of su: run a command without root privileges

I'm writing a shell script where most commands don't require root privileges. The script should be ran by the administrator. But I would like to be able to "su" to a normal user account for the parts ...
1
vote
3answers
765 views

How can I suppress the “…this does not map back…” message when using SSH?

I am writing a script that attaches to several of our machines via SSH to check some usage stats. Each time I do: ssh -i ~/.ssh/ourkeyfile.pem user@host I get the typical message: Address ...
1
vote
4answers
706 views

move files from one device to another

I am trying to automate a remote backup on our centOS server, I run the current command : nice -n 10 mv -vfb /media/localbackup/* /media/remotebackup/ however when this is ran I get the following ...
-2
votes
1answer
3k views

accessing own XAMPP directory through shell putty [closed]

I am trying to compare directories from a shared host server and directories located in my own computer. Own computer has XAMPP as the server. To compare these two directories, I need access to the ...
0
votes
2answers
89 views

Copy file to backup directory preserving folder structure

I have to copy a file in a directory, to its backup directory, preserving the folder structure. Ex. The file aaa in MyFolder/Test/aaa to .MyFolder.bck/Test/aaa I tried to use cp --parents ...
1
vote
2answers
602 views

SSH direct stdin and stout to and from postgres client

my local can connect to remote , but it cannot connect to dbserver. remote can connect to dbserver (with psql). I want to run sql scripts from my local against the db. I am looking to a way to open ...
1
vote
1answer
451 views

w command not showing users when not root

I have multiple users logged on my server (ubuntu 12.10), with ssh. None of them has root privileges. If I log in with my admin account and type w the resulting output is: 17:21:05 up 10 days, ...
5
votes
3answers
4k views

chsh: PAM authentication failed

i want to change default shell env and run chsh -s /bin/zsh as root user, but a error message appeared: chsh: PAM authentication failed. i find this thread ...
1
vote
2answers
56 views

I want to filter out two lines from the output of a program [closed]

I have a command that outputs a bunch of data, but I only want two lines. Grep doesn't work because the lines I want are not next to one another. I can't seem to figure out sed... Help please. :) ...
0
votes
1answer
678 views

expect script not working with bash script

I want a script that ssh to remote server and then run a script which is at my local machine and then store the output on my local machine Expect script for ssh to remote server: #!/usr/bin/expect ...
5
votes
1answer
1k views

nc (netcat) hangs, waiting for more data, in UDP mode.

I'm trying to send a small string to statsd via nc inside of a read block: while read line; do printf "folder.counter:value|1c" | nc -q 0 -u $host $port done Unfortunately, when in UDP mode, nc ...