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

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3
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45 views

Memoizing/caching command line output

I have a bash script I use to run a few python and C++ programs in a sequence. Each program takes in some input parameters which I define in the bash script. So as an example I run the program like ...
3
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0answers
109 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 ...
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240 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
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865 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
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0answers
187 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
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0answers
39 views

How to get the executed command of a process which has completed successfully using the PID?

I have small script, abc.ksh that takes 3 parameter e.g abc.ksh ${a} ${b} ${c} I will read from a config file with 'n' no of entires and I will execute abc.ksh 'n' times in parallel using a for loop. ...
2
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0answers
26 views

Producing the next available filename for a pattern (02-output.log etc)

I can use mktemp(1) within a shell script to make a temporary file in a directory with a suitable suffix & prefix. Is there a command that, given a pattern (e.g. NN-output.log) will look for ...
2
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0answers
16 views

Using a web browser to generate a gallery/slideshow from local files

I'm trying to see how far I can go with using a web browser for various tasks vs. native apps. One of these tasks is selecting a group of local image files and generate a preview/gallery/slideshow in ...
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28 views

i3status script that change its text by itself

I am trying to add a block for rss the latest news in my status bar. The news is composed by a title and a description. The full text doesn't fit in the status bar, so I would like to make it read ...
2
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31 views

How to properly use $_ inside a tcsh script sourced from another tcsh script?

I try to retrieve the result from $_ inside a tcsh script itself sourced by another tcsh script (I'll refer to them respectively as the inner and outer script). But $_ is not set with the value I ...
2
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0answers
85 views

How to count nodes and get attribute value without using xpath

Currently I have a shell script like this: LOGIN=`curl 'https://www.ponta.jp/u/LWAS900/SLWAS900010.htm' -sS | grep '<input type="hidden" name\|<form\|</form'` for i in $(seq $(printf ...
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96 views

How do I write a Bash script to autoadjust the screen resolution of Enlightenment 20 running under VirtualBox?

I have noticed that VirtualBox guest additions fails to autoadjust the screen resolution of Enlightenment 20 on a few different platforms (including Arch Linux, Lubuntu and openSUSE Tumbleweed), see ...
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20 views

On using $hash_array[$(global_alias)]

Identical code works on one system, fails on another: % zsh --version zsh 5.0.7 (x86_64-pc-linux-gnu) % typeset -A frobozz % alias -g foo='echo xyz' % frobozz[$(foo)]=9 % echo ${(kv)frobozz} xyz 9 ...
2
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0answers
48 views

How to avoid namespace collisions/pollution in a script meant to be sourced?

I want to implement a script foo.sh that culminates in the an execution of a command bar (with some arguments). The command bar modifies the current shell environment, which means that foo.sh must be ...
2
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0answers
38 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
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0answers
249 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
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124 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 ...
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84 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
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103 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
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0answers
327 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
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0answers
70 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. ...
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194 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
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0answers
186 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
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0answers
95 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
5k 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
292 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
251 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
3k 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
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0answers
115 views

how to list blocked connections events by the firewall?

So, I used firestarter that had logged blocked connections events with some useful details (but it is not being updated and I found somewhat unsafe as any moment we could click to deactivate the ...
2
votes
0answers
694 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 ...
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0answers
20 views

American Fuzzy Lop run test program as unprivileged user or in chroot

I'm attempting to test tcsh on OS X with American Fuzzy Lop as an exercise, but don't want to accidentally clobber any useful files on my system. Knowing essentially nothing about fuzz testing, I did ...
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0answers
37 views

Changing permissions of the file, while using sftp command in a shell script

How can I change the permissions of the file/command, while using the sftp command via a shell script? My sftp connection is established, but it fails while executing the chmod command. As of now, I ...
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0answers
12 views

Linux Mint Corners Musical Sequence Associative Array

I am writing a script which uses hot corners to play specific musical notes when hovering in corners, and depending on the musical sequence to execute a specific command. The script is called with ...
1
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0answers
24 views

pmap hangs on OOM process

I did attempt a search, but there doesn't appear to be much out there on pmap so here goes. I have a script that works with WebLogic instances to gather data on them which we can send to our Devs for ...
1
vote
0answers
36 views

How to make excel interpret Chinese characters in CSV file

I am sending a report from a unix shell script that contains chinese characters. When I open the CSV report in plaintext editor like textmate I can see the chinese characters but when I open CSV ...
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0answers
43 views

CSV copyscript not copying 5 files out of 4000+

I was provided a great bit of code for searching and copying files listed in a csv from a directory and its subfolders in an answer to my previous question. However, some files are not copied. The ...
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0answers
81 views

How can I switch from one user to another user inside a script?

.The issue is my id 'aaa' can read only the file name and not the contents inside it when I log in with my id "aaa". So to read the contents I have to switch to another user "bbb" which is having ...
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0answers
41 views

C shell. Make script wait for Gnome-terminal to finish

I am working on a script that has to process a lot of data. All comes down to 3 commands. I use: #!/bin/csh gnome-terminal -e "ssh $servername1 'command 1'" & gnome-terminal -e "ssh $servername2 ...
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0answers
61 views

Bash - Regex to match tuples of numbers

I want to check if a string that has been written to a variable in bash via the read command is a tuple of two numbers. To my knowledge, this should be possible with if [[ "$input" =~ "$regex" ]]; ...
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0answers
174 views

How to redirect linux command outputs to specific row and column in csv?

I'm working on Unix Build post documentation process, I have a CSV file to be filled in and uploaded for every new build, to ensure the servers are build as per the original request. The CSV file ...
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0answers
129 views

Bold and Underline using echo with email

I am using a script that emails me a particular status report. The script sends me the contents of several files. I am using echo to provide a heading in the email that is used to differentiate ...
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0answers
107 views

File exists but errors with “mv: cannot stat: No such file or directory”

For some reason my script cannot copy or move files that exist. It comes up with the errors below. Can someone tell me why? cp: cannot stat '/mnt/sd/bbu/install/scratch/bin/.': No such file or ...
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0answers
34 views

Piping to 'tee' commands prevents changes in environment variables

I have a csh script using which I modify certain environment variables and echo values of these environment variables from within this script. I source this from another script: source ...
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0answers
277 views

Error “dircolors: no SHELL environment variable, and no shell type option given”

Running Linux Mint 17.3 Cinnamon A while ago a created a script that changed the colors in the Terminal (to match a tutorial I was following) However if I open the terminal on another account, I get ...
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0answers
46 views

Schedule (Cron) executing tasks based on bash scripts using CronniX

I'm still quite new you Mac and OS X but do have some background about other UNIX based systems, so please excuse for any misunderstandings. My goal is to implement a function that executes certain ...
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0answers
56 views

Netcat server/client for a social thread

I have been learning nc for a while now, and I decided to make a social thread server for it in bash. Surprisingly, I got it working, but I have a couple problems with it. My main problem I want to ...
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vote
0answers
15 views

Autoloading a particular driver, based on a detected specific kernel

I need some help in writing a tiny script and determining its placement within Debian 7.9 filesystem. As the title says, the script needs to be executed automatically on startup and, after checking ...
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0answers
15 views

Need Help to Solve Screenlock Bypass Issue for Expired User Account

I have created a script that I deploy to my children's computers via Salt. The script implements allowed working hours and has worked well, but one of my children have found a way of bypassing this ...
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0answers
46 views

Unix: C-shell:Disk space checking in Hp-UX

i have 10 devices that using hp-ux and i want to check the disk space in each devices. my requirement is if the space more than 90%, the info of device ans space will be save to a log. this is list of ...
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0answers
55 views

OS/X: can't execute shell scripts - spawns a new window which exits immediately

Issue: When I try to open any shell scripts a new window is spawned, which exits immediately. Files .bash_profile, .bashrc and a helloworld.sh are tested examples. Interestingly, running open ...