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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3
votes
1answer
321 views

Encrypting/Decrypting a file using openssl through an autorun script

So I am trying to encrypt/decrypt a file using openssl. I am running it through a script that is automatically run when I mount a USB, and decrypts the file. However, it doesn't work quite right, so ...
0
votes
1answer
329 views

insserv: warning: script 'uwsgi' missing LSB tags and overrides

This is my code: #!/bin/bash daemon="$APPVENV/bin/uwsgi" args="--emperor $APPCONF/uwsgi/app.ini" pid="$APPDIR/emperor.pid" case "\$1" in start) echo "Starting uwsgi" ...
1
vote
0answers
93 views

Bash and background processes PGID and receiving signals

My actual problem is that a process I run in an rcfile in docker as docker run container bash --rcfile rcfile remains attached to the bash session by sharing the PGID which means that when I Ctrl-C an ...
0
votes
1answer
24 views

Trouble using ssh-key gen specifying location and password

This is my code: ssh-keygen -t rsa -C "$APP" This works perfectly. However it then asks me to specify location and password. I was hoping I can automate this all in one go, however this command ...
0
votes
2answers
368 views

Netstat count TIME_WAIT connections by port

I can obtain individual TIME_WAIT counts on a port, netstat -nat | grep :11300 | grep TIME_WAIT | wc -l; but how to do this based on all ports eg: 11300 2900 connection 3306 1200 connection ...
0
votes
2answers
55 views

Generating random passwords with shell on server deployment

I'm trying to generate random and secure passwords to my various configuration files and settings on the fly when I run my automated deployment script. I want them to be generated, shown to the user, ...
0
votes
0answers
41 views

Elevated privileges for non-modifiable install script

I need to give permission to a local user to run an installation script that requires root privilege. So I created a special group in which this user is a member of and gave the permissions to the ...
0
votes
0answers
33 views

different interactive and non-interactive shells

A user account has it's shell defined in passwd file as bash. I would like to change this user account's shell to tcsh for non-interactive jobs (like ssh ), but keep interactive shell to bash. Is ...
-1
votes
1answer
118 views

Login by ssh , change the remote PS1 and don't quit the remote ssh shell [closed]

I want to change PS1 when i ssh another centos strshell = 'PS1="remote!"' os.system("ssh -i %s -l%s -p%s %s %s"%(SSH_KEY,SSH_USER,SSH_PORT,des,strshell)) ssh quit automatically. I want to ...
0
votes
2answers
89 views

How do I capture the Maven Jar name as a part of a Hudson job?

I have a Maven 3 job configured in my Hudson server. When the Hudson server successfully builds the Maven jar, I have the jar being deployed to an SCP repository on another server. I want to execute ...
-2
votes
1answer
656 views

Crontab not working to send email [closed]

I have CentOs 6.5 running on a VPS Host. I installed crontab and email using the below commands yum install vixie-cron service start crond chkconfig crond --levels 235 on yum install sendmail ...
1
vote
0answers
240 views

SSH without invoking shell

I've managed to mess up some shared libraries on my system, and now my shell cannot be run, thus locking me out of the system. Both ssh, sftp, and scp, as configured on the remote system, seem to rely ...
-1
votes
1answer
578 views

How to access a system with write permission after file system check fails?

I created three new partitions, but after a reboot, the system is being dropped to a shell: /dev/mapper/group-newpartition: clean, 11/655360 files, 276620/2621440 blocks [FAILED] An error occurred ...
-2
votes
1answer
58 views

zsh substitution, can't do regex with repetition

I'm trying to perform ZSH variable substitution, but I'm having to do it the lame way, by piping through cut. Is it possible to perform this operation entirely within ZSH? ...
0
votes
1answer
238 views

Where is this bash shell alias being configured?

While logged in as root onto a CentOS 6.5 system, I run ># alias alias cp='cp -i' alias l.='ls -d .* --color=auto' alias ll='ls -l --color=auto' alias ls='ls --color=auto' alias mv='mv -i' alias ...
0
votes
1answer
59 views

chattr: undefined symbol: set_com_err_gettext

I've moved my CentOS 6.5 installation to a new server and I'm unable to use chattr on my new server: chattr: symbol lookup error: chattr: undefined symbol: set_com_err_gettext How to resolve this ? ...
0
votes
2answers
1k views

Can't run AWS CLI from CRON (credentials)

Trying to run a simple AWS CLI backup script. It loops through lines in an include file, backs those paths up to S3, and dumps output to a log file. When I run this command directly, it runs without ...
1
vote
1answer
711 views

How to prevent syslog message popping in a ssh session without affect other sessions?

i have a machine(RHEL 5.2) which receives syslog message from remote machines. And now it keeps popping message from remote machine in a ssh shell, which is annoying when i want to do something on it. ...
0
votes
0answers
86 views

Distributing Master node ssh key

For the master node to passwordless-ly ssh into the slaves, the master needs to distribute its ssh key to the slaves. Copying key using ssh-copy-id asks for the user password. If there are hundreds of ...
2
votes
3answers
136 views

Can I use Bash interpreter in service/daemon scripts?

I'm writing a Debian/Ubuntu service that should start on at runlevel 2-5. Most of the existing services I came accross are written using /bin/sh (Shell) interpreter while /bin/bash (Bash) offer lot ...
2
votes
3answers
102 views

Common login script

Few weeks ago I thought it would be a good idea to write a script which should send me an email whenever some user would log in into my server. So I came to a perfectly working script ...
0
votes
7answers
353 views

better way to loop through a list of servers

I regularly do things where I loop through a list of servers to take some action. For example: for s in `cat servers.txt` ; do echo; echo $s ssh $s 'do something' done I'm wondering (from a ...
0
votes
1answer
164 views

Shell script won't run ruby script file

My shell script (my_shell.sh) won't run the ruby script ("ruby_script_1.rb) in it. my_shell.sh #!/bin/sh # Invoke the ruby script here ./ruby_script_1.rb It could not find where the ...
0
votes
1answer
77 views

Bash function hangs while command run perfectly without function

Following function hangs : ssh() { local RESULTS; RESULTS=$(ssh $USERNAME@$SERVER $SSH_COMMAND1); echo $RESULTS; } ssh; while if i run following commands they work fine : ...
0
votes
2answers
205 views

Access local console via SSH

I am searching for a way to interact with a local console via SSH - just as you would do with an directly connected keyboard. In my particular case I got a debian server (console only, no X system) ...
0
votes
0answers
36 views

Ctrl-C is ignored by pppd when put in a shell script

I'm trying to connect to GPRS network through a serial port connected GSM modem. When I call /usr/sbin/pppd call <peer_name> from the command line, It correctly receives and handles Ctrl+C from ...
0
votes
1answer
60 views

prevent normal users from running code on a cluster outside of pbs system

In our cluster with PBS batch system (torque) installed, we wish all the users execute their jobs by qsub so that the CPU resources can be well managed. However, it is found that users in our cluster ...
1
vote
3answers
179 views

How to log multiline message with logger command?

I want to log a multiline message into the system logger via the commabnd echo -e "foo\nbar" | logger But it appear as 2 logs. Is it possible to log as a single log?
4
votes
5answers
399 views

Hide the output of a shell command only on success?

Hiding the output of a shell command usually involves redirecting stderr and stdout. Is there any builtin facility or command which by default hides the output but on error dumps all the accumulated ...
2
votes
2answers
135 views

How to keep script from swallowing all of stdin?

I have a script that reads from a pipe in a loop and runs an expect script and a normal shell script in the loop. Both scripts run ssh to another server to grab a piece of data. For example: cat ...
0
votes
2answers
51 views

Delete oldest directory, skipping two of them

I have to delete oldest directory. But, two of directories does not have to be "included" in this action. So, directory content looks like this: [root@myserver backup]# ls -la total 84 drwxr-xr-x 21 ...
3
votes
2answers
964 views

Linux locale: en_US.UTF-8 vs en_US

I usually config my ubuntu via sudo locale-gen --purge en_US.UTF-8 And I've the installed locales # locale -a C C.UTF-8 en_US.utf8 POSIX Is it okay since I am missing en_US?
8
votes
7answers
526 views

Find directories, where files with a specific ending are missing

I want to display all directories, that do not contain files with a specific file ending. Therefore I tried using the following code: find . -type d \! -exec test -e '{}/*.ENDING' \; -print In this ...
1
vote
3answers
234 views

locale-gen with purge does not work

I use the --purge option to remove existing locales before generating new one, but seems cannot remove existing locales? e.g. # locale-gen --purge en_US # locale -a C en_AG en_AU.utf8 en_BW.utf8 ...
1
vote
5answers
163 views

How to split the output into different files?

I have a input file like foo xxx yyy zzz foo xxx yyy zzz foo xxx yyy zzz foo xxx yyy zzz bar xxx yyy zzz bar xxx yyy zzz foo xxx yyy zzz .. How to split the input file by line, into foo.txt ...
0
votes
1answer
526 views

Shell script only executes partially when run with CRON [duplicate]

I've written a shell script that does the following: Retrieve mail from a POP3 account (using GetMail) Save a copy of that email to S3 (using AWS CLI) Email me the filesize of the email The ...
1
vote
1answer
293 views

Replacing LineFeed \x0a with SED

I have to delete lots of Linefeeds (Hex \x0a) in a logfile. I just have sed to solve the problem. It is a bit complicated I know.. Do you have idea how to solve the problem? Here is an example ...
1
vote
1answer
4k views

What's the difference between sudo su - postgres and sudo -u postgres?

PostgreSQL users peer authentication on unix sockets by default, where the unix user must be the same as the PostgreSQL user. So people frequently use su or sudo to become the postgres superuser. I ...
3
votes
2answers
607 views

What is the difference between “su --command” and “su --session-command”?

Running # su - oliver --command bash gives a shell but also prints the warning bash: no job control in this shell, and indeed Ctrl+Z and fg/bg don't work in that shell. Running # su - oliver ...
0
votes
1answer
347 views

Disable the ability to hide bash command history

User can hide the command history in bash by either append a space before the command unset HISTFILE How to disable this?
0
votes
1answer
967 views

Create setenv.sh to set system property

I have to use setenv.sh to set system properties. I am using Linux OS and Tomcat Server 6. As described here Linux Environment- setenv.sh , I have created a setenv.sh in tomcat/bin, and the only ...
0
votes
1answer
32 views

Dpkg: After comparing config files, how do I revert back to make my choice?

I'm part way through a fairly large apt-get upgrade which had 65 packages to be updated. I've gotten to a config file "merge conflict" where both my local config (containing a licence key) and the ...
0
votes
2answers
185 views

Gnu parallel not utilizing all the CPU

I have a simple python script that read from stdin (a single line), do some processing (string parsing, no IO involved) and output to stdout e.g. python parse.py < in.txt > out.txt I have an ...
0
votes
1answer
588 views

How to set the default shell when chsh is not present

I've a Synology DS412+ NAS box running Busybox, which has a default shell of ash. Previously, ipkg install optware-devel was run and it installed bash and set it as the default shell. Running ipkg ...
8
votes
2answers
783 views

Symbolic link and sudo

I create a symbolic link: ln -s /tmp/folder1 /tmp/folder2 Then I go to /tmp/folder2 and run pwd: $ cd /tmp/folder2/ $ pwd /tmp/folder2 $ sudo pwd /tmp/folder1 # <-- This is the odd part Why ...
-1
votes
2answers
143 views

can't find the executable for the command linux 'source' [closed]

i am using ubuntu server 12.04 lts. I am looking for the executable of the linux command source i can not find in the /bin nor /usr/bin nor /usr/sbin nor /usr/local/bin . I used whereis source it ...
4
votes
1answer
114 views

Is there a streamlined way to export settings from an existing CentOS 5.10 server for local Vagrant provisioning? (Puppet, Chef, shell, or otherwise)

I've recently started the process of learning how to use Vagrant for spinning up a local development environment. (after getting frustrated with the various WAMP stack options) Vagrant is great so ...
0
votes
0answers
2k views

rsync: getcwd(): No such file or directory (2)

I want to sync Server1 and Server2's logs to LogServer. For Server1: rsync -avz -e 'ssh -p 2188' user@server1:/usr/local/servers/logs/* /usr/local/logs/ This one works, but for Server2: rsync ...
0
votes
1answer
78 views

How can the mutt shell-escape feature be disabled?

We are thinking of offering mutt for our member's email client. The user's shell is instead the mutt application launched on their Maildir folder. It works great so far but one huge problem is the ...
2
votes
1answer
40 views

Inspecting how $PATH gets created

Is it possible to "listen" to a variable's value during the start of a new shell? I have a script that checks for the $PATH variable in the typical places, but I'd like to try something different. ...