Programming :: Bash: Handling Input From File And Keyboard?

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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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 :: Try/except Error Handling In Bash?

Jun 30, 2011

I found, in bash, something similar to 'try/except' in python. I've been using something like this:

Code:
if ! 'command';then
echo 'damn, there was an error'

[code]....

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Programming :: Bash: Feeding Input To A Script From A Text File?

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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Programming :: Bash SMB Script Error Handling

Jun 1, 2011

I have a script that connects to a windows server, downloads a file, appends to it and then re-uploads the updated file. I want to implement error handling. An email is to be generated indicating whether there was an error or not. This email should include all standard and error output as a body. The current script looks something like this:

Code:
function Email_ServerSupport {
for time in once; do
echo "Subject: Billing - smb copy to accounting" $1
cat /tmp/smbx
cat /tmp/smbxerr
done | mail $EMAILADDR
}

/usr/bin/cp /dev/null /tmp/smbx
/usr/bin/cp /dev/null /tmp/smbxerr
cd /tmp
/usr/sfw/bin/smbclient $LOCATION -A $AUTHFILE >>/tmp/smbx <<EOF
get $OUTFILE
exit
EOF
cat $INFILE >> $OUTFILE
/usr/sfw/bin/smbxclient $LOCATION -A $AUTHFILE >>/tmp/smbx <<EOF
put $OUTFILE

cat /tmp/smbx | grep -v "Domain" | grep -v "putting file" | grep -v "getting file" >> /tmp/smbxerr
if [ -s /tmp/smbxerr ]; then
Email_ServerSupport " ERROR"
exit
else
echo "Transfer successful."
Email_ServerSupport " SUCCESS"
fi

The reason for the grep -v's is because, from my understanding, when using smbclient, ALL output goes to stdout, even errors. For this reason, I need to filter out lines including "domain" "putting file" or "getting file", all of which aren't errors. The problem is that even though the script seems to catch errors successfully now and then, the success email ends up blank (/tmp/smbx is somehow empty). I'm also worried it could miss possible errors I haven't tested. I'm thinking it has to do with the way "EOF" functions. Is there any way to capture output from the "put" and "get" commands? I can't simply redirect the output, can I?

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Programming :: `find . -exec' Handling Backticks In Bash

May 15, 2011

i had a problem with the find command in bash (which i deem is close enough to a promming language, if not please move this thread :P). i tried to reduce the command to the problem. i want the backticks, or $() for that matter; to be evaluated by -exec of find, not by bash. is that a caveat of find?

Code:

$ find testd -exec echo `basename {}` ; #confused me
test
test/a
test/b

[code]...

edit: i found out whats causing this. `basename {}` gets evaluated by bash before find is invoked, returns {} and `find . -exec echo {} ;" is run. now my question is, how to escape this eveluation from happening before.

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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:

Quote:

#!/bin/bash

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 :: Read Keyboard Status (not: Wait For Keyboard Input)?

Jun 28, 2011

has bash a command that reads the keyboard status and exits? I want to write a loop of this form:

Code:
while [ 1 ] do
sleep (1)

[code]....

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Programming :: Watch For Keyboard Input Without Waiting In C?

Jan 25, 2011

I have a C program that may finish in seconds or weeks depending on the data. For the longer jobs I want to be able to press a key and get an intermediate result printed.

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Programming :: Java Needs To Quit If No Keyboard Input For Several Seconds

Mar 29, 2011

I've got a program that takes keyboard input with BufferedReader and readline(), but readline() is blocking so I can't increment any sort of counter to quit the application after a period of inactivity, because the program is just waiting for an input from readline(). Do I need to create multiple threads, where one thread counts down an inactivity timer, or is there some method of using non-blocking keyboard inputs?

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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:

Code:

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Programming :: Read Multiple Input With Bash?

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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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.

Code:

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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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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 :: 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: "
read -e SELECTED_NUMBER
cp /home/user/$SELECTED_TAR$SELECTED_NUMBER /home/user/backup

[code]....

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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:

Code:
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 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:

Code:

zip -r example * -e

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

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General :: Store User Input In A Config File GUI For A BASH Script?

Dec 4, 2010

I'm trying to create a backup script. For my second version, I want to make a GUI that will ask the user three things:

1. which folders should be excluded
2. where to store the backup
3. the user's email

I need to store this input, and later input the values into variables in my script. How do I go about doings this?

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General :: Handling Wordbreaks In Bash Completion?

Feb 16, 2010

I am writing completion function for one PHP framework called symfony. It has command line interface with syntax:

Code:

symfony [options] [namespace:]action

I want to make action be autocompletable. The function is simplest so far:

Code:

function _symfony_commands()
{
[ -r "cache/completion/.sf" ] && cat cache/completion/.sf
}

[code]....

But, if there is : symbol which separate namespace from action problems coming:

symfony doct[TAB]
will be completed to
symfony doctrine:

But nothing happens if you want complete after : symbol. I've found out that for readline there is three words because it splits line with $COMP_WORDBREAKS

Code:

$ echo $COMP_WORDBREAKS
"'><=;|&(:

I played with $COMP_WORDS array and tried every thought I had to make it work, but failed.
What I should do to escape colon and make readline consider it as one word? Or there is way perhaps to workaround it?

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Programming :: Splitting A File Based On The Values Read From An Input File?

Jul 27, 2010

I am splitting a file based on the values read from an input file. The below one is the script.

1)How do I add the header which is present in the original file to the new split files created?(For eg. pharmacyf conatins header as table column names. The new files created (ODS.POS.$pharmacyid.$tablename.$CURRENT_DATE.dat) are without the header).

2) Also the script is creating 0 byte files for the pharmacyids which are not available in the intial file? Can this be avoided?

for pharmacyf in *
do
tablename=`echo $pharmacyf |cut -f4 -d'.' `
while read pharmacyid
do
grep -w $pharmacyid $pharmacyf >> $OUT/ODS.POS.$pharmacyid.$tablename.$CURRENT_DATE.dat
done< inputfile
done

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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 :: Read Each Line Of A File As Input?

Jun 21, 2011

I'm writing a program which now accepts user input:

Code:
echo "Enter a date in the format YYYY MM DD hh mm ss."

read gregyr gregmo gregdy greghr gregmn gregsc This lets the user input a date and time, such as 2011 06 21 15 12 45, and have each number assigned to their corresponding variable. Later in the program, these variables are put into an equation, and then the terminal spits out the answer. Now I have to have the program read all of the lines from a text file, which is in this format, assign the variables.

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Programming :: Bash Read Input Word For Word ?

May 4, 2010

I am pretty new to bash scripting...I am trying to write a script that will take an input and read it word for word and then DO something with it like echo. I have been able to find how to read word for word from a file but I don't know how to do it with input.

I was looking for something like

Code:

exit 0 The input would be A-Z a-z 0-9 and have a single space between each word.

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Programming :: Graycode To Hexadecimal Converter From Input File?

Aug 25, 2010

Design, debug and test a C program that uses Gray Code for decoding information stored in a binary file. Gray Code G(A)of any value A can be easily produced from unsigned binary B(A) using the expression: G(A) = B(A) ^ ( B(A) >> 1 ) (1) The formula may be used to generate coding tables. For example for 4-bit codes:

Table 1. Coding table

Hex Value Binary Gray

0 0000 0000
1 0001 0001
2 0010 0011

[code]....

If the first option is selected, your program shall prompt the user to enter the file name and open the specified file. In this assignment you can presume that the file size is always limited to 64 bytes. If the file is not found, the program shall display a message: File not found and display the menu, so the user can enter file name correctly or exit the program.

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Programming :: C++: Getting And Handling Web Data?

Jan 29, 2010

I'm just starting out on a project relating to web search, to be done in C++. Which library should I use to help with downloading web pages into memory so that I can process them? The big thing is I want to be able to download the pages into variables/structures without actually putting them onto the hard disk.I googled and saw libcurl, but I was confused by some of the examples and wondering if this was really what I wanted.

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Programming :: How Error Handling Is Done In C

Jan 3, 2010

I wonder how error handling is done in C in real applications, by returning a error code when something goes wrong, or by using setjmp and longjmp, or something else?

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Programming :: Using Piped Data As Input - Cannot Stat '-': No Such File Or Directory

Nov 6, 2010

Code: stuart@stuart:~/$cat showthread.php.html | grep -o [URL][^"< ]*" | uniq | head -n3 | plowdown - cannot stat '-': No such file or directory Code: stuart@stuart:~/$ awk NR==$x Musiclist.txt | cut -d/ -f6 | basename $1 .mp3 .mp3 Here's some system info on the bash i'm using:

[Code]...

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Programming :: Write A Program Which Will Read Input From A Text File

Apr 7, 2010

i am trying to write a program which will read input from a text file, check if each line contains any alphabets and then display a message imforming me if there is an alphabet in each line. My text file is formatted in this way...

[Code]....

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