Programming :: Bash: Passing Output To Another Programs Input?
Nov 12, 2009
I am not sure if that Subject really explains it, basically I have a script that executes a CLI java-applet that requires a passphrase from the user. I can easily execute this by issuing the -p argument followed by the passphrase however that shows up on possible logs or at least on the results of the ' ps ' command. If you do not supply this -p argument it provides a new line with the echo " Enter Passphrase: " and asks for input.
how can I provide a result/input for the Passphrase request and is it still possible to throw this application in the background with the ' & ' following the command? I have seen a few examples that show a /bin/expect that expects a result and sends a command however I would like to refrain from any extra dependencies. Example of Regular Execution of application:
Code:
$ /usr/local/***/**** -u USERNAME -r Default-Realm -f certificate.der
Password:
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Apr 13, 2011
I started to run a C++ my program in Linux and I don't know how to test my program that works fine with a text file. This is a project for my uni and to explain more clear, My program is a sample database for modify or add and search and it read data from a binary file and also write into a binary file. I have got an input from my lecture and she said after compiling in Linux I must write:
1-to compile:
Code:
g++ (files with cpp)
2-to see the output:
Code:
./a.out
3-to test with input:
Code:
./a.out < input.txt >
My problem is in step three. What I must write in the command part after" step2" to see the output?
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Aug 27, 2010
How can I to pass a perl variable into html input tag? For example, If a have got a cgi script:
Quote:
use CGI;
use DBI;
my $owner = $cgi->param('owner');
[code]....
How can I to pass $owner variable?
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Jun 5, 2009
I am trying to figure out if there is a way to start a process, and while it is running, pass input to it as though it were a stream. Although the subject of this post mentions this question is "language-neutral", specifically, I am trying to do this in Common Lisp. Truly, I am looking for the principles behind the method of doing this, which seem to me as though they would be language neutral.
I have done Google searches, and found nothing relevant to my query. Without using sockets and IP communication, I would like to start a process (let's use the MySQL command-line client, for example) and then in my Common Lisp (CL) program, pass it input like so:
Code:
(format *mysql-client-instance* "SELECT * FROM some_table;")
Simply, how would I go about sending input to an active process as though it were a stream? My thinking is there has to be some way to do it - similar to the Expect superset of Tcl.
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Aug 30, 2010
If I have an interactive program, e.g top, which, after launch, can be fed with key strokes and changes its behavior, for example, after launching top and then pressing "1", you can see the CPU utilization per core. I was wondering if there is a programmatical way to do so, so I don't have to press "1" every time. I would think it is an easy task, but so far my attempts have failed.
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May 8, 2010
I have a file with around 1000 IP addresses in it and I need to be able to ssh into each one of them, run a single command, and then exit. I already know the ssh command I want to run and it looks like this:
Code:
shpass -p [password] ssh -p 10022 -o StrictHostKeyChecking=no root@[ip variable] 'reboot'
(I know shpass is not good to use and keys are the correct way but I don't have any other options in this scenario.) if these ip addresses were in a .csv file, by themselves with no other information, how would I create a script to do the above command to each ip until the end of the file?
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Jan 14, 2009
I cannot for the life of me get this little (simple) script I wrote to work. Here is the entire script:
Code:
#!/bin/bash
ASPECT=`mediainfo $1 |grep "Display aspect ratio" |cut -d : -f 2`
HEIGHT=`echo "320 / $ASPECT" |bc`
SIZE=`echo 320x$HEIGHT`
[code]......
An input filename ($1) is fed into mediainfo, which by the use of grep and cut spits out a single number which is the aspect ratio. This is then divided by bc into 320, which gives the desired height dimension for the file that I want ffmpeg to create for me. Finally, ffmpeg runs using the calculated dimensions... Basically, it's the passing of the $ASPECT variable to bc that seems to fail. It looks like bc won't read the output from the mediainfo line... It always crashes out with:
Code:
(standard_in) 1: illegal character: ^M I've tried doing something even simpler like this to debug by just trying it to display the calculation on the screen:
Code:
#!/bin/bash
ASPECT=`mediainfo $1 |grep "Display aspect ratio" |cut -d : -f 2`
HEIGHT=`echo "320 / $ASPECT" |bc`
echo $HEIGHT
and it does the same, so it's definitely bc that won't accept the output from mediainfo.
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Mar 20, 2010
Now, I have one script called "defcon" defcon gets the current DEFCON level and outputs it using echo.
Code:
#!/bin/bash
DEFCON=`curl -s http://members.tripod.com/~Swat_25/defcon.html | sed -n '/^$/!{s/<[^>]*>//g;p;}' | sed '/^$/d' | grep '[12345]$'`
echo "The current DEFCON level is $DEFCON"
The second script ("tweet") updates my twitter account.
Code:
#!/bin/bash
curl -s -u USER:PASS -d status="$@" http://twitter.com/statuses/update.xml > /dev/null
What I want to do is be able to update my twitter account with the current defcon status (this is really more of a learning thing than something I actually want to be doing). The original script for tweet replaced $@ with $1, but if I use:
tweet `defcon`
it only uses the first word in the string, similarly if I used $2 or $3.So I changed it to $@. The normal function still works, but typing:
tweet `defcon`
updates twitter with nothing.
EDIT I should mention the /dev/null is there to catch the output of curl, otherwise it won't run silently. It still updates twitter normally with the send to /dev/null
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Jul 15, 2010
I have a bash script called bash I am trying to execute from PHP. I think I have that right (not sure yet). Ideally let me explain what I am doing. The front end will pass a variable from a text entry box, called New_Task, the New_Task needs to be executed in the bash script and the output needs to be displayed back on the front end. So let me give some code and let me know what you all think.bash code is quite long, but essentially it is made to take a entry and create a task out of it. eg. "svn branch <Task Name>". The code below is getting the New_Task variable passed from the text entry box ($NewTask) and I have an exec for the bash script, but I am not sure it is working, I need to add some code to see the input in the front end.PHP back end code:PHP Code:
function mTaskCreator()
{
$strAction = $this->_objUserContext->mGetPostVar( 'acti
[code]...
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Jun 5, 2009
When in the interactive envirment, my Input and Output are all mess-up. So i want to color the Input and Output with two different colors.. so i can figure them out..
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Dec 18, 2010
I am looking for a prgramme that output the lyrics when I give it an mp3...
Code:
fetchlyrics mymp3.mp3
based on its data inside of mp3
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Apr 24, 2010
Is it possible to pass arguments to a source file in a bash script? For example
#!/bin/sh
#
. /dir1/dir1/funclib -a -b
How would you check for the passed arguments in funclib without getting confused with any arguments passed to the main script?
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Apr 16, 2011
I get no print to stdout on screen from the C code.Does bash somehow block or mask it?I get print from bash. I get this error in the non-test bash script like: let "rdval = $rdstr"syntax error: operand expected (error token is " ")The let command prints rdval= but I presume this is due to the printf test statements getting in the way.I am getting no compile errors. Why does the C code not print the values specified?
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Sep 17, 2009
I'm trying to implement an assert function similar to:[url]
However, I'm having trouble with file existence testing when the file name has a space in it.
I have distilled the problem down to the following:
This code works as expected, printing 'yes' if '~/test file' exists, and no if not.
Code:
However, this code gives an error.
Code:
The error:
Code:
Which tells me that it is splitting ["~/test file"] into ["~/test] and [file"]. Why? Is there a way around this?
Note that if you simply use a file path without a space, both cases work perfectly. Is this a BASH bug possibly? I just can't understand why the first would work, but the second wouldn't.
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Jan 14, 2011
I have a text string I want to pass as the second arg to a bash shell.
My python line is :
The first arg "gap" works great and the bash shell uses it as $1
I need "fill" passed along as $2 intact
Here is the bash line:
As you can see after the -f it has to be in single quotes and $FILL will complete the single quote
Nothing is getting passed as a second arg from python, I did have the first word at one time but that was 85 tries ago and forgot how I did it!
The bash script complains about an unterminated quote.
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Jul 21, 2010
I am having a strange problem I've never encountered before. I have an Asus Eee S101 10.1" netbook with the 32GB SSD. I installed Ubuntu 10.04 Netbook Edition.
The other day, I was browsing with Firefox, when suddenly the entire computer came screeching to a halt. Had to power it down with the power button. After this happened, I have been unable to use the same Firefox profile I had been using. I had to start Firefox from the command line with the -ProfileManager switch, then create a new profile to keep browsing.
I wanted to completely get rid of the old profile, so from the Profile Manager I tried to delete the old one. Computer hung, had to reboot with the power switch. I then tried to browse to the .mozilla/firefox directory and delete the profile's directory there, from both Nautilus and the command line. Both times, the computer froze.
I tried a few more times, and the couple of times the computer didn't freeze, I got an error from the command line saying a Bash input/output error. After this error appeared, it would appear no matter what command I ran - I couldn't even run a sudo reboot now.
I can create/delete other files and directories, just not that Firefox profile.
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Aug 14, 2010
I am creating a 15 integer array which is input from the user and outputted for the.
Ex.
Enter the array values: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Your values are: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Code:
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Sep 7, 2010
While making a shell ,there is the following problem Im facing:
I am expecting the user to enter commands in the following format :
I am to separate these and the output of ls -l should be given as input to grep and the output of both to more.
But I am allowed (by our instructor) to use dup/dup2 or any other command(but not pipe or tees).
How to connect the file descriptors after successful execution of each command?
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Jul 13, 2011
Dear advanced c/g++ programers:A program request me to enter twice inputthat program probably is tested good on visual c++ 7.1 on window xp,but my system is g++ on linux(Ubuntu10.04)
It assume
Enter some strings: a b c d
^Z
[code]....
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Oct 7, 2010
I am using sda1 as /, which is a bootable drive. I do not know if my problem is that I did not create a /boot drive. After removing the iso dvd, I tried to reboot and I get this back: -bash: /sbin/reboot: input/output error Then it returns me to the terminal prompt.
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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:
Code:
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May 7, 2010
As I'm starting to learn bash scripting I'm trying to automatize some tasks I usually perform. I have a notification mail I need to send several times a day. It has this structure:
Quote:
Dear user,
blah blah blah blah
You need to contact the following people:
[code]...
To replace "user", I found this:
Code:
read -p "Please enter username: " username
echo "Dear $username,"
Which probe to be very useful with other simple notifications like this. But I don't know how to manage the email addresses as they are usually more than one and could vary from 1 to 10. They should appear one above the other. I found this: "Here is a little work around. The only thing the user needs to do is hit enter without anything else on a line and it will close out"
Code:
#!/usr/bin/ksh
word=a
until [[ $word = "" ]];do
[code]....
I tried to use it and modify for my needs but I failed, I don't realize yet how can I use it. If possible, I would like to use the until loop like the above example just for learning purposes but any other form will be accepted as well.
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Jun 2, 2009
I've been using python/bash to help myself automate things for a long time, however I am curious. One reason I use python more is because I don't quite know how to work with user input in Bash, such as getting it to ask for input and wait, and then placing that user input into a command.
Here's an example of a script I use from time to time for converting OGG video files into AVI.
How could I write this same script in Bash? Keep in mind I am mostly self taught, so I am by no means an expert programmer.
Code:
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Jan 28, 2010
As i am new to C++ i couldn't figure out how to input a file and make some change on the file and produce a output file. like this problem i have is.
"Program that processes an input file and produces an output file. The input file will contain lines of data, each containing two floating point numbers. The lines of the output file should contain the two numbers read and their average (with a '$' sign and 2 places after the decimal point)."
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Mar 4, 2011
I've been searching the forums and google in an attempt to find an answer. I'm completely new to scripting and just want to get one or two up and running but I'm having problems with my current script. I want the script to:read my inputs run a loop in certain steps
within the loop execute a program with output to another file enter the values into the program (Problem area)
Quote:
#!/bin/bash
echo "Enter the Lower value, followed by [ENTER]"
read L
echo "Enter the number of steps you want to take, followed by [ENTER]:"
read s
[code]....
Running the program from the shell asks for 3 variables, which in my script are i, tt and adstep. I understand conceptually why it won't work. It won't move onto the next line in the loop until the previous task is completed (which doesn't even start without the 3 inputs!)
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Jan 20, 2009
I have this little shell script which copies file names taken from inputfile:
Code:
while read line; do
cp -i $line something
[code]...
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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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Nov 17, 2010
I have a script which checks on my jobs that run on some cluster.The script, "script.sh", takes as an input the job-id for the job to be checked. Sometimes I have 100s of jobs and I want to check them all (for successful completion.) I could put these job-ids into a text file, "job-id.txt", each id in its own line.For each job-id, the script would ask me few questions (with a yes or no answers) to see if I want to do some other checks for each job-id.I want to know how may I direct my job-ids from this text file into the script one job-id at a time.
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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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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/$SELECTED_TAR2
I was thinking something like this:
Code: echo "Enter a selection: "
read -e SELECTED_NUMBER
cp /home/user/$SELECTED_TAR$SELECTED_NUMBER /home/user/backup
[code]....
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