Programming :: Shell Programming - Delete User Input

Jan 21, 2011

I recently started shell programming and my task now is to do a menu display.Currently i am stuck whereby user will input both title and author and it will delete it.

Do i have to use sed command?

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Programming :: Take A Single Line Of Input From User In Shell Script?

Mar 10, 2011

How do i take a single line of input from the user in a shell script?

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Programming :: Start A Process And Send Input To It In A Shell Script?

Jun 9, 2011

I'm building a Linux From Scratch system and partially automating it. I will likely want to do it again, and I would like to try to almost completely automate it.

My current approach is a script that takes an input file and sequentially runs each line in a new instance of bash. If one fails, it gives me the number of the step that failed so that I can use the "--step" option to resume after I fixed the issue.

This has some problems:
A varible created on one line will not be accessible on the next line. This is because each line is run in a separate shell (the reason for this is so that the commands in the input file and the script's internal variables can't interfere). You can't switch users or use chroot, again because each line is run in a separate shell.

What would be nice is to be able to start a bash process in the background and send commands to its stdin. I guess that a named pipe would work, but the named pipe will be gone after a chroot. Is there a way to do it without relying on the filesystem? Also, how do I know if the command failed?

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Programming :: Shell Scripting For Accepting Input From Different Directories Automatically

Nov 6, 2010

The two shell scripts (t1prog and t2prog) are given below they are working fine. The input for the first program is 't1.det' and for second program is 't1.rnaml'. These two input files are in 'dir1' folder. I am executing the shell like 'sh t1prog > t1out' and 'sh t2prog > t2out' from this directory only. Then I am executing a java program 'java RNA'; for this, t1out and t2out are input files used in the program and I am getting the final output on screen.

The input files 't1.det' and 't1.rnaml' are in different folders with same name and with different values. Each folder specifies one gene sequence input files.

In mfold directory there are 5 directors and each directory contains these input files as shown below
cd mfold
dir1 dir2 dir3 dir4 dir5
cd dir1
t1.det t1.rnaml


for inputs in different directories and executing these and redirecting the final ouput after executing 'java RNA' statement to a file is needed.

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Programming :: Delete A Line From File Using Shell Script?

Oct 16, 2010

i have a file containing contents as

1 2 3
2 2 3
11 2 3

now i want to delete the line which first column content is 1. so, if i pass the parametere 1 to function delete_row. is should remove the first row as

2 2 3
11 2 3

and then write the contents in file.

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Programming :: Shell Script To Delete File If It Exists

Aug 10, 2010

I am writing a shell script to delete a file if it exists.

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Programming :: Search File By Pattern And Then Delete Corresponding Lines In Shell?

Sep 16, 2010

I have such a file(test.txt):

abc 123 456
abc 256 145
axd 125 225


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Programming :: Made A Shell Script To Copy And Delete Files Through FTP?

Feb 13, 2011

I have made a shell script to copy and delete files through FTP.I want to first delete all txt files and then mput all txt files.

ftp ()


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Programming :: User Input Bash Script

Apr 28, 2010

I've written a bash script that allows a user to input a directory location to find out the size of the directory. However, if the user inputs a directory and finds its size then inputs another directory then wants to quit, the script asks the user numerous times if he wants to quit!! The script won't exit until the number of times the user looks at a directory is reached! What gives?

Here's the script:


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Programming :: C - User To Input The Name Of A File As An Argument

Aug 5, 2010

Write a program that requires the user to input the name of a file as an argument. If the user fails to include one argument it should make use of a thread that handles a signal. The signal handler should tells the user Incorrect number of arguments and then calls the terminate signal on the process.

If the numbers of arguments are correct then the program should allocate memory space to the file (5MB) and create a child process that requests the user for a character that it should send to the parent. The child should keep request for data until the user keys in the character O. During each request it should pause for 10 seconds, send the character to the parent and then requesting again for another character.

The parent should get the character from the child. Do not make the parent wait for the child to finish requesting for data. Make use of pipes to facilitate communication between the parent and the child. A second child should be created to read and display data from the file. Make use of any appropriate Inter Process Communication technique to ensure that the second child and the parent do not access the file simultaneously (Mutual exclusion).

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Programming :: Working With User Input In Bash

Jun 2, 2009

I've been using python/bash to help myself automate things for a long time, however I am curious. One reason I use python more is because I don't quite know how to work with user input in Bash, such as getting it to ask for input and wait, and then placing that user input into a command.

Here's an example of a script I use from time to time for converting OGG video files into AVI.

How could I write this same script in Bash? Keep in mind I am mostly self taught, so I am by no means an expert programmer.


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Programming :: Shell Script To Automatically Delete Files With The Same Name As The Parent Directory?

Mar 18, 2010

I am facing a problem in Windows due to a virus called Newfolder.exe which creats files with the same name as it's parent directory and an extension .exe and this happens for every directory in the entire hierarchy in the infected pen drive. The antivirus detects them, but is sucking slow. So I thought this is a good opportunity to use the concepts of the all mighty shell script to remove those as they follow the same pattern. Say my complete path is



The virus would have created an file with complete paths



If fol1 has two more directories fol11 and fol12 Then there would be two more .exe(virus created) in the following path



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Programming :: Shell Script To Delete Files Which Location Should Be Read From Log File

Jun 26, 2010

I have 2 external hdd in wich I have all my files. yesterday, I have copied all the files from hdd2 to hdd1 and I want to eliminate duplicates so I used FSLint to find them,now I want to make a shell script to delete all the files/entries (read from the log file) that begin with.

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Programming :: Create/delete Temp/backup Files Through A Shell Script?

Dec 31, 2008

I have a shell script that need to create some files:

1) backup files of user passed in file ( that will be written by this shell ).

2) temp files that the shell will create and later delete/remove.

This shell script will be used from my local dir ( I am not a super or a sysadmin ). Users of this shell will call this script to run on their local files in their respective directories. When my script runs, it errors with the following:

cp: cannot create regular file `./listfile.txt.backup': Permission denied
/home/myUser/tools/myShellScript: line 12: listfile.txt: Permission denied

for the temp I was able to avoid this error by creating the temp file in the /tmp directory. All I want is for this shell script to run, create/modify/backup files in user's local dirs.

The user dir has the following permission:

drwxr-xr-x testDir

the file that needs to be backed-up has:

-rw-r--r-- listfile.txt.

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Programming :: Array Size Base On User Input?

Oct 27, 2010

If I have an array which its size is based on the user input, from some material, I need to use malloc function to allocate memory for that array what is known dynamic array. Don't forget to free it.hat's fine, however, I like to try things out even I know the program will crash.I have written some test program on my Mac using C language like this:int width = 0;//get user input, and assign the input value to width, for example, 3char * array_var[width];and width is an int, its value will be assigned by the user input. The point is, this program work as expected, for example, in command line, I input 3, then array_var length is 3, its size is 3 * sizeof(char *).

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Programming :: Bash Script Predefined User Input

Aug 9, 2009

I have a script im having some problems with, what I need is to have the system generate a random password for me and use that password when creating new users to it.

System is Debian Lenny and script is in bash.

The program is znc. I have made it so that it will generate the random password on the shell but the problem is to use it in the bnc software.

To make a password there the command is znc --makepass and look like this:

My question is now if it would be possible to put in the script so it would "answer" when it need those passwords ? the random password that is generated is in a variable called $setpass and is NOT crypted.

Or is there any other software that would be able to generate that md5 string for me ?

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Programming :: Shell Script To Delete Part Text Of A Line If Pattern Matches?

Apr 12, 2010

I am trying to create a shell script, on taking a input file as parameter, which need to do 3 things

1) create a copy of existing file.

2) add a new line to the copied file.

3) strip off all the absolute paths inside the copied file

The first 2 points are straight forward. but i am finding it difficult to acheive the 3rd point. myself not very good with awk and sed. but gave it a shot in vain. For example, the input script consists of below,

PROGRAM=`/usr/bin/basename $0`
HOST=`/usr/bin/uname -n`
echo Start $PROGRAM `/usr/bin/date` |
/usr/bin/tee -a $LOG

The output of the script should look like,

PROGRAM=`basename $0`
HOST=`uname -n`
echo Start $PROGRAM `date` |
tee -a $LOG

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Programming :: Finding A Shell Script To Delete Files Which Location Should Be Read From A Log File?

Jul 16, 2011

I have 2 external hdd in wich I have all my files.... yesterday, I have copied all the files from hdd2 to hdd1 and I want to eliminate duplicates so I used FSLint to find them, now, I have a txt file that looks like this:

Code: /media/My Book/!!!MIS DOCUMENTOS/Documentos/2 sep2003-jun2009 USB/!TESIS/TESIS/TESIS CVT LABVIEW Y CODEWARRIOR/LabVIEW85RuntimeEngineFull.exe /media/My Book/HDD_Toshiba/Borrable/Pen_Drive_4GB/Tesis/Super CD de la tesis/LabView/LabVIEW85RuntimeEngineFull.exe multiplied by millions of entries...

now I want to make a shell script to delete all the files/entries (read from the log file) that begin with:


/media/My Book/HDD_Toshiba/**** Since HDD_Toshiba is the folder in hdd1 (MyBook) that contains all the files from hdd2

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Programming :: Catch User Input While The Bash Script Is Running?

Oct 30, 2010

How do you catch user input while the script is running? Or, how would you make two scripts run at the same time, but use input from one script to the other? The program I'm trying to make, echos text on the screen continuously, but while thats happening, I want the user to be able to input something, so the program can detect the input and display something else. So I thought maybe I could make two scripts run to do each task.

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Programming :: Bash - Calling A Specific Variable Based On User Input?

May 3, 2011

I'm trying to call a specific variable based on a user selection. For example:

Code: Select a file:

[1] foo.tar
[2] bar.tar

Enter a selection: I have already coded each possible selection to have its own variable. If the user selects 2 I need to select $SELECTED_TAR2, or if they select 1 I need to select $SELECTED_TAR1 and then do something like this behind the scenes:

Code: cp /home/user/$SELECTED_TAR2 /home/user/backup/$SELECTED_TAR2

I was thinking something like this:

Code: echo "Enter a selection: "
cp /home/user/$SELECTED_TAR$SELECTED_NUMBER /home/user/backup


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Programming :: Bash - Read User Input: URLs Without The Enter Key Stroke?

Sep 23, 2010

Here's a challenge I've been struggling for months with:

I have a bash script that reads URL addresses of our internal server and then executes some test commands on them. Something like this:

read -p "Enter URL: " url
sh execute-what-ever-to $url

After copy-pasting the URL the user taps the enter key and the script proceeds, but here comes the tricky part: I want this to work without the need to press the enter key after copy-pasting the URL.

"read -n" does not work in this case, as the URLs vary greatly in length. However, the URLs always end to the same string. They could be like "http://url1/END", "http://url2/END" and so on. So this ending string "END" could be theoretically used to recognize that the whole URL has been pasted.

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Programming :: Bash Scripting Handling User Input Sections Automatically?

Jun 17, 2010

I have a system setup script for my Slackware installations that pulls all packages and source files from another machine and sets everything up to be identical between machines. The script works as expected but make it entirely unattended. How do I make the bash script deal with automatically selecting "Yes" for, for example "Install x(Yes/No): " when prompted by a make file?

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Programming :: Perl - Way To Encrypt Command-line Input When User Enter A Password ?

Nov 4, 2010

I need user to input a password through command line in Windows cmd prompt. Is there a way to encrypt the input (such as put it into ......) when user is typing ?

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Programming :: Bash Scripting - Taking User Input And Adding It To A Particular Area Of A File?

Jan 12, 2010

in bash scripting...say I want to take the input from a user via a question...I would do this:



echo "How large do you want this partition to be in GB (enter only the number)?" read PART_SIZE echo "You want your partition to be $PART_SIZE GB" But I don't want to echo it back to the screen, I want to add it to the content of /etc/fstab. I have been mucking around with sed to find the tmpfs partition in /etc/fstab and add the partition size attribute (this is to use the onboard RAM as a volatile partition)...but am not having any luck...

The portion of /etc/fstab that uses /dev/shm for the tmpfs partition is:

tmpfs /dev/shm tmpfs defaults 0 0

So, if a user says "24" GB to the answer (from above), how do I get it to automatically add that value to the tmpfs partition line in /etc/fstab? So it would look like:

tmpfs /dev/shm tmpfs size=24g,defaults 0 0

I understand that I would also have to come up with a way to put "size=XXg", which I could do with a copied over generic file before this action...then the script would have to find "XX" and replace it with the user's figure...

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Programming :: Bash Scripting With Sudo / Password Prompt And Accepting User Input?

Jul 30, 2011

I'm creating a bash script to do some tasks for me. I would like the script to be run at a set time of everyday. My first question is if it is possible that if one of the commands in the script requires sudo, is there a way to get around it with out making sudo not require a password. Such as, is there a way to include the password in the script? If that is the case, I can always just set the file as read only by sudo. I've been looking for a way to do this, with no success. if I have a command that wants input, how do I give it to the program. For example, if I want to make a zip file that is encrypted, the command would go as:


zip -r example * -e

now how would I get the script to insert my wanted password.

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Programming :: Shell Scripting: How To Create A User

Sep 5, 2010

How do I create a user account in a shell script? I know this may sound n00bish to you, but I know it's more than just mkdir-ing the home directory and subdirectories.

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Programming :: Use Firefox As User-interface For Shell Script?

Mar 29, 2010

In Windows, I was able to use IE as a user interface because I could code a WSF (Windows equivalent to shell script) to respond to events in IE.Now that I've moved to Linux/Firefox, I'd like to use Firefox in a similar way. Specifically, I would like to write a bash script to run lsdvd with XML output, use XSL to transform the XML for Firefox, then take an action (encode a selected track on the DVD) based on the user's selection. I would be happy if I could make Firefox write something somewhere that the script could read, but I suspect that security measures would prevent that.

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Programming :: Create A Simple Program With Will Continually Read Input From The User Until They Enter A Blank Line?

Apr 6, 2011

basically i have to create a simple program with will continually read input from the user until they enter a blank linei know how to read in certain input but not sure how to get it continually in a loop

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Programming :: Shell Script That Deletes All Files Owned By A User?

Jan 14, 2010

the script should take as input in the begginig the username of the user and then deletes all the files and folders from the user in every place he has them. script must also check if the parameters have been given correctly (only one and that one must be a username) Doesnt all the files of a user exist on a folder with his name? what if i delete this folder? Will something like this work?


if [ -z "$1" ] # Exit if no argument given.
echo "Usage: `basename $0` directory-to-copy-to"


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Programming :: Bash Shell Read User Argument From Command Line And Test It

Aug 29, 2010

Trying to create a small script that will read user's input, test if user entered some input and if not display some message or display a text using user's input.

The script is the following but i get an error saying "[: 6: =: argument expected"

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