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

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-1
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1answer
65 views

Starting Debian mono application (that has a GUI) AFTER boot is done [duplicate]

I've been trying to figure out how to start an application after Debian (Wheezy) is done booting up and on an LXDE desktop session. It is a mono C# application. The script I have is simply mono ...
2
votes
2answers
73 views

Difference of using () and $() to execute a series of commands

I am currently trying to make a script that creates bytes that will be piped as input to netcat. Here is the idea of the script: (perl -e "print \"$BYTES\x00\"; cat file; perl -e "print \"More ...
0
votes
1answer
35 views

Want to use find with rsync in script

I'm trying to make a script that will run in cron, that will search a path for specific file name. In the path there might be more folders with that same file name. If found and they are newer than 2 ...
-2
votes
2answers
53 views

How to make a password box in linux? [closed]

I have a script but can't find mistake: #!/bin/bash data=$(tempfile 2>/dev/null) trap "rm -f $data" 0 1 2 5 15 dialog --title "Password" \ --clear \ --passwordbox "Enter your password" 10 30 ...
1
vote
2answers
30 views

How do I generate diffs for a series of files?

I have a series of a few thousand files, all with filenames in order, so let's say file1.x, file2.x, file3.x, etc. All these files are in the same directory. I know how to generate a diff from ...
1
vote
3answers
57 views

Killing the previous instances of a script before running the same unix script

I want to kill the background process of the same shell script that i am going to run again. That means before executing the shell script i want to delete the background process running for the same. ...
3
votes
3answers
106 views

How to kill this process in bash

I am trying to interface my homemade Raspberry Pi-powered arcade machine with a coin acceptor, and for that I: use a shell script (named gameplay) which starts the game emulator (MAME) when a coin ...
1
vote
2answers
69 views

bash command/script to reset default route

I manage several OpenWrt (embedded linux) routers for which I've written bash scripts to run an Openconnect VPN client. The client uses "vpnc-script" to set up routing, which replaces the initial ...
2
votes
1answer
49 views

Stable timing for shell scripts?

The run times of scripts vary quite much. I would like to find similar time -function as Matlab's timeit, described here. For instance, I am evaluating these commands here about counting quickly ...
1
vote
1answer
29 views

Conditional file and directory installation in Debian Packages

Is it possible to create a binary Debian package with conditional files and directories installation (e.g. installation of an init script in /etc/init.d/ after being confirmed by user)?
0
votes
1answer
22 views

How to make sure the same string doesn't appear next to itself in an array?

I'm making a Rubik's Cube scramble generator, and the turns can't be side by side or else it's useless. I'm trying to stop it from doing the following: Displaying the same string twice, i.e R2 R2 ...
3
votes
2answers
129 views

To count number of matches in a mega string quickly

I have big text-data without spaces and without other rows in one line. In reality, the streams are 0.2 Gb/s, similar situation here, but in this task, counting occurrences which is more challenging ...
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
26 views

Exceeding paste's length limits in resulting line? [closed]

I'm in a situation where I am extracting files using Informatica.My problem is that in extreme cases I'm exceeding the maximum length for a resulting line for the header line. I'm on Oracle. What I ...
5
votes
1answer
58 views

Script started as `source` or `executable`?

Can we determine inside the very script whether it started as source (.) or executable (shebang or something alike)?
-1
votes
1answer
65 views

Pass string value to date in Unix

mm="27 Jun 2011" dd=$(date -d'27 Jun 2011' +%Y%m%d) echo $dd I want to use value of mm in second line. When i tried like below dd=$(date -d'$mm' +%Y%m%d) It is giving error.
-1
votes
2answers
96 views

shell script not running using crontab

This is my script mboxutil -l > n.txt sed 's/^.*user//' n.txt > n1.txt cat n1.txt | sed 's/^.//' > n2.txt sed 's/\/.*//' n2.txt > dss_list.txt rm -f n.txt rm -f n1.txt rm -f n2.txt sed ...
0
votes
1answer
54 views

How to extract particular fields from lines using shell commands?

File1: 27/07/2014 10.10.03 Breaker1 was closed by Mr. A.Basu Spectrum ui6dms 29/07/2014 04.50.53 Breaker1 was opened by Mr. D.Gupta Spectrum ui6dms and one note added 30/08/2014 03.20.01 EarthSwitch ...
0
votes
2answers
68 views

What is wrong with the code? [closed]

#!/bin/bash for ((i=1 ;i<=3;i++)) do echo "Enter gallon used(gal):" read gal echo "Enter Miles Obtained(mil):" read mil mileage=`echo $mil / $gal |bc` echo "scale=4; $mileage " | bc c=`echo $c + ...
0
votes
3answers
188 views

Bash: increment a variable in a while loop?

Bash newbie here! I have a bash script that for each file in a set, greps each line in the file for a string. Then it splits the line on commas, converts the 7th element to a float, and increments a ...
6
votes
3answers
372 views

Should I use a slash at the end of path variables in shell script or not? [closed]

Today when writing my shell script. A question suddenly comes to my mind. Since cd /target_dir and cd /target_dir/ both works. Should I add a slash at the end of my path variables in a shell script? ...
2
votes
3answers
230 views

Am I using a while loop wrong?

I found a list of projects to do, and one of them was something that generates amounts of change. I made this code: getamt() { echo "Enter amount of money." read amount echo "OK." } change() { ...
0
votes
2answers
72 views

validate record count in header

I am trying to write a script that should verify total detail records equal to the Record_count in header record, If not throw an error sample data 0001 HD SAP _AP Distribution 20150615 131723 ...
0
votes
1answer
18 views

Substituting the value with spaces for a variable in bash script - the correct way

I have a compilation script that can compile the program with and without the debug symbols. I want to ask via bash prompt ( read ) the user to choose whether he wants a debug version or not with ...
0
votes
1answer
67 views

Export mysql to remote server using one SSH session

I've come across a situation where I had to create a utilitary shell script that would be executed in many servers from different regions. The objective is to dump the local mysql database, copy it to ...
-2
votes
1answer
53 views

Comma and newline replaced with comma [duplicate]

How can I find the solution to replace ":" and newline with comma, and to remove "./" below is the sample format. ls -lRm ./www.toncemoy.com: www_ttoncemly_com, www_ttoncely_com, www_toncethly_com, ...
4
votes
4answers
428 views

How to Check the existence of multiple files in a directory and zip the same

I am facing an issue while checking the existence of files ending with the same string/pattern. The file names might be as follows abs_123.unl xyz_123.unl Currently my code is as below and working ...
1
vote
1answer
74 views

Syntax error at a semicolon in a shell script

The one liner command will be longer but this is the part that is throwing the error. for user in natural1 ; do cat <<EOT >> /home/$user/public_html/.htaccess <FilesMatch ...
1
vote
1answer
48 views

Silent installation of shell script using bash file [closed]

I have a setup file for Linux which is in shell script format. I'm trying to perform a silent installation by writing a bash script. When I directly access the script I'm unable to suppress the setup ...
3
votes
1answer
178 views

Approximating a floating point number with correct rounding off

How can I approximate a floating point number using shell-script (say, up to 4 digits after the decimal point)? I have two examples: A=1.2345678 and B=1.2345678E-05. So I would like to get ...
1
vote
6answers
489 views

Hiding Password in Shell Scripts

How can I hide a password in shell scripts? There are a number of scripts that are accessing database. If we open the script others also aware the username and password. So if anyone knows how to hide ...
0
votes
3answers
70 views

Creating a script that runs a simple command for all files in a directory

I need to use the text-based browser Lynx to dump 1000s of html files into text files, with the same filename. For any given filename.html the command is lynx filename.html --force-html --dump > ...
0
votes
1answer
52 views

Practical usage of “shift” shell builtin command?

I checked the /usr/bin/ssh-copy-id(part of openssh-client package at least under Debian) shell-script and it contains following if-statement: if [ "-i" = "$1" ]; then shift # check if we have 2 ...
0
votes
2answers
61 views

generate alphanumeric string from pattern

I want to generate host names for example from my patter like this: inc-[tnc][app|web][1-10] where it should output like below: inc-tapp1 inc-tapp2 . . inc-tapp10 inc-napp1 . . inc-capp10 inc-tweb1 . ...
1
vote
1answer
58 views

Can someone explain this tail + line to me?

I'm looking through some of the scripts that are on the servers and came across an 80MB shell script. Naturally curious I decided to look in there and came across this line: tail +4802 $0 | zcat - | ...
-2
votes
2answers
58 views

Enter a variable into a command in bash

My question should be simple for you guys. I am writing a simple script that runs a command but the file it would need is always different. Is there a way for it to ask: "Where is the file?" And ...
1
vote
2answers
61 views

How do i search for certain sections of a file and then extract only relevant information within that section?

So I have a text file that is a server report and has about 1000 lines of information in it. I'm trying to write a script that can search the report for only certain pieces of information I'm looking ...
0
votes
1answer
36 views

Is it bad practice to put sections of main code in functions? [closed]

I didn't like the way the code that I had looked, so I compressed all of the main 'blocks' into functions. (This would also prevent the code from running if an error was present.) I don't know if this ...
10
votes
6answers
1k views

Is it possible to substitute “then” with brackets?

I first learned how to code in a C language, and using if ( code ) then code fi makes it really hard for me to read my code (don't ask why). Is there a substitute for then? Something like this: ...
-3
votes
2answers
45 views

Transform text records using only a “for” loop

I have an input file that is text, consisting of lines that look like: 352|C|PAID|7036|VOICE|01-FEB-12 I need to split each line into fields at the | (vertical bar) characters and output each field ...
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votes
2answers
21 views

OpenDNS automatic diagnostic

I've contacted OpenDNS support because advertising are not filtered on this site http://www.backpackerboard.co.nz/ They asked me to read this manual instructions ...
-1
votes
1answer
27 views

Comparing Oracle version in bash script

I'm trying to create a bash script to install an application that requires Oracle 11g client. How can I read in the version info within the bash script? sqlplus when run in Putty spits out the ...
0
votes
0answers
22 views

Run a command stored in a variable [duplicate]

I am working on updating some scripts we have used previously ( on RHEL) to work for a new flavor of Linux (ESX). As I am modifying the script, I wanted to add user feedback as well as some other ...
0
votes
1answer
100 views

How to clear log files periodically

Hi I am new to Shell script. i want to clear log files in a directory basing on the dates. I have managed to gather this code: DIR1='/home/u01/app/oracle/servers/DIR1/logs' ...
1
vote
2answers
57 views

How can I delete <93> <94> symbols in file? It is equivalent “ ”

I copied text from a PDF file in bash - vi and I get lines like this: echo <93>The Hypotenuse is $hypotenuse<94> I tried to change that in vi by: s/<93>/"/g But: E486: ...
4
votes
6answers
353 views

Loop in text files shell script

I have a list of files in one directory and a set of jpegs corresponding to each file in another directory. I need to loop over all files, and for each file name, determine the target directory. For ...
0
votes
1answer
39 views

A script to install OpenVPN & modify iptables?

I d like to automatize the install/config of OpenVPN on my client machines. Roughly, it should looks like : - apt-get openvpn - cp, edit, .... - modify iptables. Is it possible in one script ? or am ...
0
votes
1answer
40 views

How remove duplicates in same file and with if condition?

INPUT FILE: has all these values without header: customer ID, code, start_date, end_date 124343, DCW, 2015-07-06, 2016-08-03 235432, ABC, 2015-04-26, NULL 235432, ABC, ...
2
votes
4answers
131 views

How to see if there are any matching characters in a string?

I'm making a card hand generator, and I want it to note if a specific hand is generated, like a three of a kind or a full house. I was trying to figure out how to do it, and I thought of using grep on ...
0
votes
1answer
35 views

Creating service in SLES / SUSE 11 SP3

I have a python script that works very well executed from a (remote) console like this : sudo /srv/web-asset-server-master/python server.py The problem is, that it only lives as long as the console ...