General :: Write A Bash Script Using An If...Then...Else Statement?

May 14, 2010

I need to to write a bash script using an If...Then...Else statement that will accept a day of the week from the command line what do I do or where do I go.

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Programming :: Write An If Statement For The First Line Of A Text File Bash?

Feb 15, 2011

At the moment I got my md5sum checking working which I write to a text file and see below.

If the md5sum works it will write the output to check2.md5 test.txt: OK

If the md5sum fails it will write test.txt: FAILED

How do I write if statement to check the output whether or not the md5sum failed or not ?

check1="/home/ops/Desktop/test1/check1.md5"
check2="/home/ops/Desktop/test1/check2.md5"
cd /home/ops/Desktop/test1
md5sum test.txt > $check1

[Code]....

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General :: Inverting A Bash Script Statement?

Jul 11, 2010

I want to have the System Bell ring when a process is over say a download. First I created a file named 'beep' that plays the System Bell. Because the System Bell rings by hitting cntrl-G the 'beep' file looks like this.

Code:

echo ^G

I then give the file owner execute permission. I know that this command would serve my purpose.

Code:

[URL]

However I want to sharpen my Bash programming skills. I wanted to write the Bash script along the following logic and with the fewest lines possible. Not really a script, I want to insert this short script via command line instead of a file. Let's say the download has commenced and the PID = 16666.

Code:

until ps -p 16666
do
/root/beep
done

Now obviously 'ps -p 16666' will already evaluate to true. My question is, is there a way to maybe enclose 'ps -p 16666' and prepend some operator that inverts the condition to where until 'ps -p 16666' evaluates to false then run /root/beep?

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General :: Bash Script Is Reprinting Part Of A Field From An Awk Statement?

Apr 21, 2010

Here's the bash script:

Code:

FILES="/usr/sbin/accept
/usr/sbin/pwck
/usr/sbin/chroot
/usr/bin/fakefile

[code]....

Notice the extra" file size" lines in there? What's causing that? I'm trying to learn more bash skills. I have no experience with awk because I have been unable to understand it's basic necessity. But I thought maybe if I try it with some test scripts I might become more interested in using it more and expand my very limited capabilities.

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General :: Write A Literal Bash Command In A Bash File?

Nov 29, 2010

I create a bash script that writes another bash file. But in the generated bash file I want to write a bash command in the file and not executing it.Here's my bash file:

Code:
#!/bin/bash
cat > ~/generateGridmix2data.sh << END

[code]...

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Programming :: Using If Then Statement Directly In Bash

Aug 12, 2009

When you use an if statement directly in bash you have to put the ";" at the end or not? or am I mixing it with the for loop? I am reading advance bash scripting and it shows the if - then statements without ";" so I need a little clarification here.

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Ubuntu :: BASH Script: Odd Output Near IF Statement?

May 31, 2010

For some reason, I get said block of errors when I run my script without arguments:

Code:
/home/mark/bin/backup: line 34: [: =: unary operator expected
/home/mark/bin/backup: line 37: [: =: unary operator expected

[code].....

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Programming :: BASH - Regex In A Case Statement?

Jun 9, 2010

the following works and BASH doesn't complain, but VIM highlights the closing square bracket is if it sees a syntax error. Is there a better way to express regex in a case statement or is this an issue with VIM?

Code:
#!/bin/bash
case $1 in

[code]...

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Programming :: Escape '*' In Case Statement Bash

Jan 23, 2010

Does it possible to escape * in the case statement

Code:

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Programming :: Run SQL Update Statement In A For Loop In Bash?

Jun 7, 2010

The script that Iam trying to write is running a for loop and reading line by line from a text file. inside this for loop i would like to execute update SQL statement .

a pesudo code is
Quote:
`$ISQL -U $username -P $Password -D $Dbname -I $INTERFACE <<QRY
for id in $idlist #idlist iam reading from a file

[code]...

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Ubuntu :: Bash If Statement To Check Installed Applications

Jul 14, 2010

I know with if statements in bash you can do
Code:
if [ $fruit = apple ]
then echo "Good, I like Apples"
fi
But I was wondering if you could do something like this:
Code:
if [apt-cache pkgnames smbfs = smbfs doesn't exist]
the apt-get install smbfs
fi
If so how would you capture the output from apt-cache pkgname smbfs to determine if it's installed?

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Programming :: Bash - Statement To Check If A File Exists Or Not?

Oct 6, 2010

This script that I found online does the job it promises. it does convert the files to mp3 without an issue. What I need to include now is an if statement that says If $file.mp3 exists then delete $file.wav

Code:
#!/bin/sh
# name of this script: wav2mp3.sh
# wav to mp3
# Credit to the script creator (Nikesh Jauhari):

[Code]...

After that I'm stumped as to how to do the if statement

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Programming :: Shell Script For Adding A Statement In A File After A Particular Statement?

Jun 28, 2010

We are building our C++ project in Kdevelop IDE. Every time we run "Run Configure" from the "Build" menu, a file named "libtool" gets automatically generated. This file contains a statement as "ECHO="echo"".f we run "Automake", without modifying the "libtool" the system hangs and theputer needs to be restarted.Therefore every time we run "Run Configure" we need to include the line "echo="echo"" below the statement "ECHO="echo"" manually.I think a script can be written which does the above on its own.I am not a shell script programmer, I know the good tutorials for shell scripts are available on the net, but learning scripting only for this task would be time-consuming and painful.

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General :: Write Either PYTHON Or Bash Shell Scripting?

Jun 4, 2010

I do not know how to write either PYTHON or Bash Shell Scripting. I am to learn one for Linux Administration purpose. Which one will you recommend for a Linux Admin/Eng environment?

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General :: Write A Bash Script To Parse A Text File?

Apr 27, 2011

I want to write a bash script to parse a text file with the following lines and set variables for each line so that I can use them in the rest of the script.

Timestamp=123456789
Company=ABC Company
Server=Server
Recipient=Joe Smith
Email=joe@abc.com

simplest way to read each line one at a time for everything before the =, set that to a variable name with the value equal to everything after the =

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General :: Write A Bash Script That Gets The List Of Files In A Directory?

Apr 5, 2010

I'm trying to write a bash script that gets the list of files in a directory and puts them into a variable, then checks each entry and outputs them as follows:

item1 is a FILE
item2 is a DIR
item3 is a DIR
etc etc.

I am able to get the list of files into a variable, but unsure how to get the output I want.

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General :: Write Bash Script To Mimic Right Button Click?

Jul 9, 2010

how do i write a bash script to mimic my right button click any ideas or command names to steer in the right direction would be great.

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Security :: Write Secure Code For Bash Scripts In General?

Feb 9, 2010

how to write secure code for bash scripts in general? Strangely I didn't found anything in google and in the forum so far. If someone here is willing to review a bash script for me (about 600 lines).

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General :: Write A Bash Script That Will Read The Word From The Text File?

Jun 10, 2011

I have a text file that contains a single word and I want to write a bash script that will read the word from the text file... The following is my incorrect attempt, as it assigns the name of the textfile to the variable as opposed to the word stored within the textfile:(assume I have a text file value.txt that has its contents a single word, say wordone)

Code:
#!/bin/sh
for f in value.txt
do
echo $f
done

so the output of the above script is value.txt, however I want it to be wordone.to summarise: how do I assign the value of the word contained within a textfile to a variable?

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General :: Write A Bash Script To Restore Deleted Files To Original Location?

Dec 5, 2010

I have managed to write a bash script that moves files to the recylce bin instead of being deleted. Then (with a bit of assistance) wrote another bash script that deletes the files from the recycle bin. Now I need to write one that will restore the files preferably to their original location? I am very new to linux and stuggling with where to even begin...any ideas? There seems to be some advice about creating a cloning tree, but I've never heard of them?

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General :: System Administration Scripting - Write Very Basic BASH Shell Scripts

Jan 10, 2011

I'd like to know some good resources, links, e-books to learn basic Linux system administration scripting. I know how to write very basic BASH shell scripts so I'm still at beginner level. There are so many docs out there that I'd like to narrow down people's opinion's on the best easy to understand resources that are available. Eventually I'd like to learn basic PERL as well.

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Programming :: Perl Switch Statement Throwing Error Like Bad Case Statement (invalid Case Value)?

Oct 6, 2010

I've written a simple perl code to learn switches in perl.My code is pasted below,

#!/usr/bin/perl
$opt = 1;
switch($opt) {

[code]...

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Programming :: Write A Bash Script That Sources Another Bash Script?

Jan 29, 2011

I am trying to write a bash script that sources another bash script. Essentially, I need a few lines to check to see if a certain variable is set. If not, I set it manually, and then source a scripts with that variable in the path. I wrote a test script to try it, but for some reason the last line does not work. Here is what I wrote:

#!/bin/sh
source ~setupdir/setup.shrc #just a test, this line works
echo ${#SETUP} # prints 0 if setup is not set, which it isn't
if [ ${#SETUP} -eq 0 ]
then
SETUP="~setupdir"
fi
echo $SETUP # prints ~setupdir

[Code]...

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Programming :: Bash Write To End Of Each Line?

Nov 29, 2010

i have a text file like

abc abc abc abc
abc abc abc abc
--- --- --- ---

i want to add a string xyz to end of each line..

abc abc abc abc xyz
abc abc abc abc xyz
abc abc abc abc xyz
--- --- --- --- xyz
--- --- --- --- xyz

how do i do this in bash?

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General :: Cd Inside If Than Statement After Fi Back To Old Dir

Jul 12, 2010

the script below prints the pwd of where I want to be. after the fi it puts me back at the original dir. just writing these scripts to understand what's going on.

#! /bin/bash
if
[ -d mydir ]
then
cd mydir/ && pwd
fi

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General :: If Statement With Multiple Tasks?

Feb 2, 2011

I want to have an if statement that does multiple things:

Code:

if [....] ; then
1=...
2=...

[code]....

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Programming :: Bash To Read Write Registers?

Jun 3, 2010

I have been looking for a script example of reading and writing to the parallel port's data, status, and control registers using bash. I see it done in pascal, tcl, etc. but nothing in bash.

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General :: IF Statement - Not Getting Equal Results From All Cases

Jun 6, 2011

I'm a bit stuck with IF statement. There is the code:
#!/bin/bash
# Variables
VAR1=test
VAR2="echo $VAR1"

# Case 1
echo Case 1
if [ test == test ]; then
echo "equal"
else
echo "not equal"
fi;
echo ""

# Case 2
echo Case 2
if [ "VAR1" == test ]; then
echo "equal"
else
echo "not equal"
fi;
echo ""

# Case 3
echo Case 3
if [ "VAR2" == test ]; then
echo "equal"
else
echo "not equal"
fi;
echo ""

When executed, why case "2" and "3" differs from case "1"? Where am I wrong and how to solve this trouble? (my aim is to get "equal" from all cases).

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General :: Can PATH Statement Be Used With Python In Ubuntu 9.10?

Oct 10, 2010

On Ubuntu 9.10 I installed Python 3.1.1 successfully with Synaptic Package Manager. However the Python interpreter cannot find my scripts, currently in /home/dave/pycode. This appends _temporarily_ but python remains clueless about location of my scripts. Searched Internet and some speak of .rc or .bashrc or .profile..files. Found some of these and opened with Komodo : they are Linux script files and I am clueless as to how to modify.Currently I can import my scripts only if I change to the /pycode dir before running.Lutz's Python book says to change PATH file - Ha .Sobell's "A practical Guide to Ubuntu Linux" is no help. Ubuntu's own on line help is worth less than a fart in a hurricane. Ubuntu's gedit would not even open bash.bashrc.

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General :: Case Statement In Shel Programing?

Mar 15, 2010

I am facing problem with the following script. Could you please look into this.echo 'Enter Staging number' case $STGNUM in

1)
for i in {'stg1-greg','stg1-marsha','stg1-peter','stg1-jan','stg2-greg','stg2-marsha','stg2-peter','stg2-jan'};do echo $i; ssh $i sudo -u dev /opt/usr/apps/workflow/stopwf.sh;done;

[code]....

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