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

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4
votes
0answers
180 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 ...
3
votes
0answers
65 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
201 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
612 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 ...
3
votes
0answers
142 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
31 views

How do I process new additions to logs

I know that I can use a few tools like tail and less to view the newest additions to a growing log file. What I want to do, though, is run some sort of script at regular intervals (like cron) on the ...
2
votes
0answers
28 views

How to recognize a state of idleness for a given period in a script?

I would like to write a simple script, that should work as a daemon. The only thing this dameon has to do is to check if for a given period neither a key has been hit, nor a mouse moved, nor a ...
2
votes
0answers
120 views

Bash - Convert escape character colored text to BBCode

I want to convert a terminal escape-character colored text file to BBCode colored text. For this i've created an Android logfile with logcat -Cd > /sdcard/logcat.txt. The -C switch adds the color ...
2
votes
0answers
68 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
votes
0answers
67 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
89 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
197 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", ...
2
votes
0answers
327 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
41 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
138 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
137 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
82 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
3k 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
213 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
199 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
2k 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
569 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
39 views

How to replace words in a string which has “|” in it

For example line, in this loop in a shell script: for ((k=13;`awk -v f="$k" -F " " '{print $f}' line$i.txt` != "|";k++)) I want to replace the words in the line from 13th position until a "|" is ...
1
vote
0answers
25 views

Bash completion function for vim 'scp://' Paths

For easily editing remote files with vim, I currently use a few .vimrc and .bashrc additions to my environment. The bash-scripting side of it "misuses" the available standard _scp bash completion ...
1
vote
0answers
31 views

How to normalize irregular data values

From a PHP table I get the values graphically represented. However some of the data recieved is 'damaged' or incorrect thus yielding a non-sensible graphical representation. The hours (y-axis) is ...
1
vote
0answers
21 views

Build Script Help, Not Loading Modules

So I am writing a script to build and install Netcdf, but when I source it, it seems like some of the lines just are not running or are being skipped and I am unsure why. When I run the code line by ...
1
vote
0answers
28 views

How can I use arptables to limit the number of outgoing ARP requests a second?

End goal: Make a script that will limit the number of outgoing ARP requests in a second using arptables. This is to have the ability to not trip the ARP-limiting feature on Cisco devices. I want to ...
1
vote
0answers
36 views

This code isn't working. (Trying to declare array values in a for loop and do math functions on them)

I was again bored and looked up a list of programs to make in bash, and I'm trying to make a CC (credit card) validator. I had to split the characters into an array to do the validation, and I think I ...
1
vote
0answers
21 views

APCUPSD script can't close program

I want to use APCUPSD to stop a program (called ns_image_server) which runs in a terminal window when it detects that power has been lost, to give that program time to close before the computer shuts ...
1
vote
0answers
131 views

sftp using socks proxy command with password authentication

I am struggling to make a sftp connection.We need to make a sftp connection to download files. My requirement is that we are moving from ftp gateway to axway and We were using ftp before to download a ...
1
vote
0answers
55 views

Problems with kpartx in a script

I am trying to run the rpi-image-creator script (see https://github.com/ImmobilienScout24/rpi-image-creator/blob/master/rpi-image-creator), and encounter some trouble with the kpartx use. The trouble ...
1
vote
0answers
24 views

How can you recover from disk corruption on a backup drive whilst maintaining all hard links?

So, I have a scenario that is similar to How to copy directories with preserving hardlinks? that I wish to use however I have corruption from the backup hardlink source. My Scenario: 1. I backup my ...
1
vote
0answers
82 views

Shell Script to change user shell

I am writing a script that would be invoked to change user shell. The basic requirement is that once user gets authenticated (e.g: thorough some web application) the script would be invoked to set the ...
1
vote
0answers
39 views

Inherit IO redirections from a script to another

When I redirect the output of a script within a script, I expect the redirection to be applied to the called script as well as the program called within it. A: ./B 2>> error.log B: ...
1
vote
0answers
52 views

Create tree of processes

I'm implementing pstree as an assignment, and I would like to create test tree of processes, but I'm struggling to do so. I tried to do something like this to create tree of background processes ...
1
vote
0answers
65 views

Why can't Firefox open a link with a shell script that uses `source`?

I am attempting to use GRC's SQRL client in Wine, using this shell script to launch it. I have a couple helper scripts that I source, in order to reduce code duplication. An example of one such ...
1
vote
0answers
175 views

Issues while eMMC partitioned using sfdisk

I am writing firmware(MLO,u-boot.img, uImage(ver 3.12), dtb, rootfs.tar.gz) programming script for am335x based custom board. Rootfile system is to be put onto the eMMC. Firmware programming script ...
1
vote
0answers
85 views

Text User Interface

I have been working on a shell script, and was wondering if I can put up a text user interface for the shell script. After some searching, I see few people suggest using "ncurses/curses". However the ...
1
vote
0answers
51 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
56 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
211 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 ...
1
vote
0answers
36 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
59 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
158 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
vote
0answers
104 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
79 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
100 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
vote
0answers
91 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
598 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
60 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 ...