Questions about shell scripts, executable files that are interpreted by a shell (bash, zsh, etc.).

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4
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215 views

How to write a shell script to run multiple command in different screen sessions?

My goal is to write a zsh script in order to create multiple screen sessions and run separate commands on each of them. I would also like to check at the beginning of my script if there are any ...
3
votes
0answers
136 views

Write the same file multiple times to one file using dd

I am trying to create large dummy files on a drive using dd. I am currently doing this: #!/bin/bash writeFile(){ #$1 - destination directory/filename, $2 - source filepath $3 - blocksize, $4 - ...
3
votes
0answers
36 views

Get notified from avahi

After looking for a zero-conf browser valid implementation I realised that inside my linux machine (ubuntu) I already have avahi and typing: avahi-browse -alr I get a complete list of all devices ...
3
votes
0answers
150 views

Securing a script a little more

I currently have the following script which works fine: #!/bin/sh user="$(zenity --entry --title="Username" --text="Username")" pass="$(zenity --password --title="Password" --text="Password")" ...
3
votes
0answers
114 views

Understanding line numbers reported when using eval

Okay, so I'm stuck working with a shell script that needs to use eval (I know, I know, ultimate evil etc…) however I'm having difficulty debugging some of the line numbers being thrown out by errors. ...
2
votes
0answers
36 views

Display cron job times in a human-friendly format

Is there a way to display or is there a tool that can parse a crontab expression and display it in a human-friendly way? 10 6 * * * sh /usr/local/crons/file_check.sh For example, for the above cron ...
2
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0answers
13 views

Get git branch from several folders/repos

I have a folder with several repositories inside. Is there any way I can run git branch or whatever git command inside each folder? $ ls project1 project2 project3 ...
2
votes
0answers
36 views

Generate array of strings combined with number

I would like to generate a local array in a shell/bash script that consists of the following elements: JF-1998, JF-1999, JF-2000,... , JF-2011. That is, a string JF- combined with the years from 1998 ...
2
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0answers
44 views

“login -qf” as root results in “Login incorrect” error

I'm trying to install pow on an OS X machine.* Some of pow's components have to run as root, so part of the setup process involves running an installation script with sudo. The problem is, this setup ...
2
votes
0answers
66 views

Copy folders at once

I want to copy a large number of folders at once not one by one. Is it correct to use the following code ? Is it helping to run the command cp for all the folders i at once? #!/bin/bash foreach i in ...
2
votes
0answers
235 views

extracting data from a log file and plotting it using Gnuplot

I have a logfile with the following data in it: Sat Sep 20 11:25:01 BST 2014 -- temp=53.0'C -- message from script /usr/src/scripts/wifi_test_2.sh Sat Sep 20 11:26:01 BST 2014 -- temp=53.0'C -- ...
2
votes
0answers
30 views

unbuffer/expect swallows the rcode when its child is signaled

unbuffer is able to pass along the return code of a process under normal circumstance, but if the process you are unbuffering is killed, for instance with a segfault, I see $? as 0 while I expect 139. ...
2
votes
0answers
78 views

When gnu parallel exit,my program also fail

I use gnu parallel to run a bash function. The function just contains the bash script to restart my program. At first, the restart is ok, but when the gnu parallel script exits, my program also fails. ...
2
votes
0answers
78 views

background gui process in shell script

In the below script, ivfstudio commands open a gui. Even launched as a background process, I need to close it first so that the next commands are executed. How to make it "really background" ? ...
2
votes
0answers
668 views

Running shell script inside with vagrant provision

I have setup a vagrant box using precise64 (ubuntu 14.04) and installed packages needed for octopress. I can ssh into the vagrant box and generate posts and run preview for my octopress site. Now I ...
2
votes
0answers
93 views

Shell scripts for the database logs

The actual log file will be like this $ cat file1.log time=2014-07-23 23:56:28 GMT, user=[unknown], db=[unknown], host= pid=28254 LOG: time=2014-07-23 23:56:28 GMT, user=portalman, db=ss, ...
2
votes
0answers
58 views

Scripts cannot run simultaneously on startup

I want two scripts (Server_drive, Server_video_boot) running on startup, but there is conflict between them. Specifically, there is always running the script with the lower priority. I tried with many ...
2
votes
0answers
1k views

Creating multicast join for tcpdump captures

I want to write a linux shell script which will capture specific multicast traffic. Specific as in, I want to create a pcap file that has all the traffic for one specific multicast group/port. Here ...
2
votes
0answers
168 views

Why is my inotifywait loop exiting after removing some subdirectories?

i have the following bash script: #!/bin/sh dir1=/source/dir/path/ while inotifywait -qqre modify "$dir1"; do rm -r /destination/dir/path find /source/dir/path/ -name .svn -exec rm -rf '{}' \; ...
2
votes
0answers
468 views

Number comparisons in BusyBox ash

I have the following script that extracts data from the EXIF command on my BusyBox ash-based system. I parse the date tag from the end of the file and use case as a final check to ensure the format ...
2
votes
0answers
166 views

Check via Shell-script if server currently streams via dlna

Currently I'm running uShare to stream videos from my home-server via DLNA to the TV. On the server there is also running a bash-script which checks if a user is connected via ssh or Samba. If this is ...
2
votes
0answers
1k views

Script stops command in it with exit 0

When I write a bash script similar to this on RHEL 6, if [ "$2" = "" ] ; then echo vip.start: ERROR: no NIC specified echo vip.start: Need IP and base interface name exit 1 fi case "$1" ...
2
votes
0answers
469 views

Validate Password for user account from shell script

Application is for a multiple server standardization script Looking for a way in a shell script to check if the password for an OS account (AIX) matches a standardized plain text password. The ...
1
vote
0answers
11 views

Handle compress command error messages on AIX

I am working on production issue and unable to reproduce error message for compress command. Current Solution We have case-esac block in shell wrapper that handles messages as follows; case "$MSG" ...
1
vote
0answers
33 views

How do you derive a decimal from a math operation involving a variable?

I'm trying to find derive SCALEFACTOR which is basically 10000/(sum of 4th column in a file). How do I get a decimal from the output? Appreciate any help in advance. #!/bin/bash ...
1
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27 views

What is the first event/file/log in linux that appears/changes on boot that signalizes network being up?

I have a vSphere farm with virtual machines and python script that handles cloning and managing of those VMs. I also have a machine (RedHat 6) that I clone if I need a new one. It has a script that ...
1
vote
0answers
24 views

Service script and shared libraries

I have the following simple script IPN in CentOS 6.5 in /etc/init.d/ #!/bin/sh # chkconfig: 2345 05 06 cd /root/IPNHost . /etc/rc.d/init.d/functions start() { echo -n $"Starting..." ...
1
vote
0answers
60 views

Questions about whiptail and bash functions

I'm a bash newbie. Say I have this script #!/bin/bash function cpp-lang { yum install "Development Tools" } function updatesys { yum -y update yum -y upgrade } whiptail ...
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0answers
25 views

Output Tmux Output to the Terminal

I'm using supervisor to monitor keep a process alive, but I do need to have contact with that process every now and then to provide user input. I would normally use tmux for this, but when I use ...
1
vote
0answers
24 views

Pass/Firefox master key integration?

I handle my passwords with pass, and I use the Firefox master password functionality. The master password is rather long and "safe" and stored in pass along with the others. For now, my usual Firefox ...
1
vote
0answers
68 views

remote control of vlc using script over ssh

I'm trying to control vlc video playback on a remote machine using a script and remote ssh. I have machine A, which logs into machine B with this command: # sshpass -p <password> ssh ...
1
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0answers
61 views

Add entries to an array inside a loop

I am trying to update an array in a linux tcsh script. The script uses a while loop, and I want to add elements to the array every time the loop iterates. Is there a better way to do this? ...
1
vote
0answers
55 views

trash and restore script - issue restoring

#!/bin/bash echo "Are you sure you want to move this file to the Recycle Bin?" "(Yes/No)" read ans case "$ans" in Yes) echo "$(readlink -f $1)" >> "$HOME/TrashLog" && mv "$1" ...
1
vote
0answers
58 views

How to select an option from a select menu from a script?

I'm working on a script to automate a fill tasks that I do hundreds of times a day, such as building iOS/Android projects, but I'm not very experienced with shell scripting. In one of the projects, ...
1
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0answers
46 views

Start glassfish in LINUX server remotely

I want to start glassfish on a server running LINUX, the problem is that my service provider does not grant access to ssh connections nor any other helpful tool to run asadmin start-domain I have ...
1
vote
0answers
189 views

Cannot add startup service to openWRT from init.d

I have openWrt installed on a TP-Link TL-WA901N/ND v3. I don't have luci package installed because I don't have enough space, so I can only do thing via cli. What I'm trying to achieve is to create a ...
1
vote
0answers
46 views

Need a script to send an email when an input has not changed for more that 30 minutes

I need a linux scrip that will send an sms when there is an input change and it has not gone to the initial state after 30 minutes, I have the following so far, but, I am sure there are few things ...
1
vote
0answers
119 views

Udev running hibernation script

I have this udev rule that launches a script when the battery level is 5% or below: $ cat /etc/udev/rules.d/90-lowbat.rules: SUBSYSTEM=="power_supply", ATTR{status}=="Discharging", ...
1
vote
0answers
37 views

Get path of currently marked file

Im running OS X and I'm wondering if there is a way to get the path of the currently marked file in Finder. Like, can UNIX determine what file i have clicked on? Reasons for this would be for ...
1
vote
0answers
27 views

Submitting a script to TORQUE `qsub`: PBS lines before or after shebang line?

I am submitting a script to a cluster that uses TORQUE. Should I add the #PBS lines before or after the shebang line?
1
vote
0answers
61 views

tput command + how to locate dialog window on the top of the screen

Is it possible to use the tput command in order to place the dialog window on the top of the screen ? For example The following dialog command display the log is running by tail command dialog ...
1
vote
0answers
76 views

Setting XDG_DATA_HOME and XDG_CONFIG_HOME on compile/per program

The goal is to have a -dev version and a stable repository-based version installed at the same time, but with different data and config directories so that the dev version is not operating on(and ...
1
vote
0answers
40 views

Verbose output in logfile and simple output on screen?

Let's say I have the following script: script.sh and i want the verbose output in a logfile and simple output on screen. Logfile should contain the csh -v script.sh output, and on the screen should ...
1
vote
0answers
155 views

script started in .xinitrc stays in processes

I have made a little startup bash-script to run before my wm starts. Unfortunately after X and WM is started this script is still listed in the in htop and I don't have a clue why... this is the ...
1
vote
0answers
77 views

Bash script for opening screens and compiling the same file

I have written a bash script to initiate separate screen sessions and run a command in each of them that compiles the same C++ source file in ROOT (an object-oriented data analysis framework ...
1
vote
0answers
69 views

Run startx & automatically embedded syste,

I am working with a board in which I run my application which use th graphical mode. Everything works perfect. I start the graphical mode like this: startx & and then I run my application like ...
1
vote
0answers
231 views

How to properly start and stop shell script in linux, busybox?

I am trying to write a small shell script that would send some commands to my tv set from my set top box that has busybox on it. The problem is that it generates huge amount of zombie processes, and ...
1
vote
0answers
96 views

Trap not trapping SIGTSTP

I have a script that keeps displaying the login prompt: #!/bin/bash trap '' 2 20 while true; do login done This is part of a bigger project so please don't tell me to just use the system login ...
1
vote
0answers
40 views

FFMPEG stream won't show up on Justin.tv

INRES="1366x768" # input resolution OUTRES="1366x768" # Output resolution FPS="35" ...
1
vote
0answers
43 views

Open to specific gvim tabs

I have a working environment that I'd like to save via a script. -EDIT: I don't need to save it's state, I just want my script to define it. Though saving state would work too I guess. Currently it ...