Programming :: Difference Between Shell And Bash Scripts?
Sep 25, 2010Whats the difference, and when do you use which?
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Programming :: Difference Between Formats In BASH Shell
Apr 30, 2009I searched around but I can't get a good handle on the difference between the following formats in BASH shell.
$VAR
$(VAR)
$((VAR))
$($VAR)
$(($VAR))
Can someone explain it, or point to a clear, concise document explaining it?
Programming :: Bash-shell-like Less Functionality In The Python Shell?
Jun 25, 2010Is there some type of functional way to read things in the Python shell interpreter similar to less or more in the bash (and other) command line shells?
Example:
Code:
>>> import subprocess
>>> help(subprocess)
...
[pages of stuff to read]
...
I'm hoping so as I hate scrolling and love how less works with simple keystrokes for page-up/page-down/searching etc.
Programming :: Difference Between /bin/bash And /bin/sh?
Dec 27, 2008I know it's a very silly question but could someone please explain the difference between "/bin/bash" & "/bin/sh" I was under the impression that both are same but following output on my Ubuntu 8.10 is making me raise my eyebrows.
Quote:
parag@station3:~$ ls -l /bin/bash ; ls -l /bin/sh
-rwxr-xr-x 1 root root 725136 2008-05-13 00:18 /bin/bash
lrwxrwxrwx 1 root root 4 2008-12-03 21:42 /bin/sh -> dash
parag@station3:~$
Programming :: Bash: Functional Difference Between Process Substitution And Here String With $( )
Mar 14, 2010Further to solved LQ thread Bash: how to populate a list of arbitrarily named files?, what is the functional difference between feeding a loop with process substitution and feeding it with a here string with embedded command substitution? ABSG pages: process substitution, here string and command substitution. This works
Code:
while IFS= read -r -d '' file
do
files+=("$file")
done < <(find $dir -type f -print0)
[code]....
Software :: IDE For Bash / Shell Programming
Mar 24, 2010I just wanna ask if there's a ide for bash/shell programming?
View 2 Replies View RelatedProgramming :: Three Scripts - Using Bash As Shell
Feb 9, 2010I am looking for three scripts (using bash as shell): to print out a list only with directories (no files) that they are found in running directory (no in subdirectories) to print out a list only with files (no directories) that they are bigger than 10Kb and are found in running directory (and in subdirectories) to print in the screen the lines of file with accidental order.
View 13 Replies View RelatedProgramming :: Bash Shell Script Arithmetic??
Nov 10, 2010I have four files that contain numbers that I grep for in a variable#!/bin/bashcat FILENAME`date +%y%m%d*.tot` | grep Grand | awk '{print $4}'
#output is
12
67
[code]...
Programming :: Combining Commands And Var's In Bash Shell Script?
Jan 5, 2011I have a command which on the command line needs to look like this
rlam -if3 '!pvalue -H image1.jpg' > image2.jpg
Nevermind what rlam or pvalue do ... they are part of a program package I am using. The above command works on the command line, and also when written verbatim in a bash shell script.
My problem is: in the script I wish to replace image1.jpg with the content of a variable, e.g.
IM1=image1.jpg
How to I get the script to insert the value of $IM into the command when the pvalue part of it needs to be quoted?
Programming :: BASH Shell Differences: Login Or Interactive
Feb 18, 2011Intuitively I think that the Login Shell and the Interactive Shell are the same applications but have access to different environmental variables.It this true? Why is there more than one type of shell anyways? You can change users with the interactive shell, why not log on with it to?
View 10 Replies View RelatedProgramming :: Loops In Bash Shell Or Variable Math?
Oct 28, 2010I am trying to map the coordinates of a grid.
Code:
R=7 # number of rows (lines)
C=6 # number of columns
X=200 # initial horizontal location
Y=100 # initial vertical location
[code]....
Programming :: Creating Array From Command Output (Bash Shell Script)
Jan 26, 2011I have a command that outputs n lines of text, and I want to place each line into an array element, but I can't seem to get the syntax correct
So my command is this:
cat $configfile | sed -n '/cluster:'$clustername'/,/cluster/ p' | awk /host/
Which produces many lines depending on the value of $clustername. I'd like to get each line as elements of an array.
Programming :: Writing Shell Snip To Import CSV Data Into Bash Array
Jan 5, 2011I have been trying to write a simple snip of bash shell code to import from 1 to 100 records into a Bash array.
I have a CSV file that is structured like:
record1,item1,item2,item3,item4
record2,item1,item2,item3,item4
record3,item1,item2,item3,item4
record4,item1,item2,item3,item4
And would like to get this data into corresponding arrays as such:
$record1[item1-4]
$record2[item1-4]
$record3[item1-4]
$record4[item1-4]
Programming :: Run Small Shell Script - Bash - Syntax Error Near Unexpected Token `('
Jul 9, 2010I was trying to run small shell script, but could not run. I got the error like in subject.
This is exact way i was trying to do.
Programming :: Global Bash Shell Functions - A.sh: Line 2: Echotm: Command Not Found
Sep 13, 2010I wonder if there is anyway to make a user-defined bash shell function global, meaning the function can be use in any bash shell scripts, interactively or not. This is what I attempted:
Code:
$ tail -n 3 /etc/bashrc
echotm () {
echo "[`date`] $@"
}
[code]....
Programming :: Perl About System Command / Fails If The Standard Shell Is Dash And Not Bash?
Jun 30, 2011I am trying to fix a perl script, and I really suck at perl. But I think this problem will be easy for people who know it.
The problem is, I have an old setup script someone wrote many years ago. It fails if the standard shell is dash and not bash. The only way I've gotten it to work is to point /bin/sh to bash. I looked thru the script and it uses "system" many places, and I think that's the problem.
I searched for it and found this link:url
My plan is to include this function:
Code:
sub system_bash {
my @args = ( "bash", "-c", shift );
system(@args);
}
Then I could simply change all calls to system into system_bash and it should work?
The parameter to the system calls is usually some variable. What if the parameter is a list already? Do I need to test for it somehow, and if it's a list, prepend "bash" and "-c" to the list? How do I do that?
In the script there are lots of places like this:
my $error = system($cmd);
if ($error) {
die/warn "some error message";
}
Shouldn't there be a return in the system_bash function?
Programming :: Bash Shell Read User Argument From Command Line And Test It
Aug 29, 2010Trying to create a small script that will read user's input, test if user entered some input and if not display some message or display a text using user's input.
The script is the following but i get an error saying "[: 6: =: argument expected"
Programming :: Invoke Java From Bash Terminal Via Shell Script Fails Under Mint Debian / Fix It?
Feb 16, 2011I am running a Java application on the command line bash terminal under Mint Debian. I have JDK1.6.0_22 installed 64-bit, and the OS is 64-bit too. I have a few JAR files in the directory and a few native LWJGL libraries. When I run the application using the command line, all works fine.
Lets assume my directory where the files are is called /home/riz/MyGame. I change to that directory and this is the command I use code...
Fedora :: Stuck With Bash Shell / Changing Default Shell To Tcsh?
Mar 14, 2010I want to change my default shell to tcsh. I used
Code:
usermod -s /bin/tcsh username
command as given at url
But if I open a new shell, it is still a bash shell.
How do I make my default shell as tcsh?
Programming :: Bash Shell Script Read File Word By Word?
Jan 21, 2011I have a output file look like this:
{"test1" : "test2", "test3" : "test4"},
How can I read word by word in each line?This is not working code:
a=0
while read word
do a=$(($a+1));
[code]...
Programming :: Bash Shell Scripting / Using The Sort Command To Sort The Top 5 CPU Processes?
Feb 28, 2010What options should I use when I'm using the sort command to sort the top 5 CPU processes (ps -eo user,pid,ppid,%cpu,%mem,fname | sort ??? | head -5) showing max to min usage?
View 2 Replies View RelatedGeneral :: Difference Between Shell And C Programing?
Jul 20, 2011Difference between shell and c programing
View 4 Replies View RelatedServer :: Difference Between CGI And SHELL Environment Variable?
Sep 8, 2009I have a application on linux , I can excute it in command line . but when I invoked it via CGI(perl) , it can not excute successfully , so I suspected that there is something different between SHELL and CGI environment , but I haven't figure out what the difference is .
View 3 Replies View RelatedGeneral :: Difference Between &> And >& In Bash?
Sep 14, 2011What is the difference between &> and >& in bash? tldp did not mention the latter one. Is it really a redirection operator?
View 3 Replies View RelatedGeneral :: Difference Between Ksh And Bash?
Feb 24, 2010What are significant differences between ksh and bash? I read somewhere that ksh is proprietary shell and bash is completely open source.
View 11 Replies View RelatedGeneral :: Difference And Working Functions Between Kernel And Shell
Apr 4, 2011I am the new child of the linux world. What is the difference and working functions between kernel and shell..
View 5 Replies View RelatedProgramming :: Shell Scripting - Difference Of "source Script.sh" And "./script.sh"?
Jul 31, 2010I added created a script /opt/path.sh to add paths for some programs in /opt. The content of the script is:
Code:
#!/bin/sh
export PATH=$PATH:/opt/program/bin
I made it executable and added it to /etc/profile. But it doesn't execute the script unless I execute it with "source /opt/path.sh" I have found something [url]. According to this, the change is only at run-time. But I thought executing "export" make it global?
Programming :: Shell Scripting / Create A Shell Script Similar To Ls?
Jun 5, 2011I am trying to create a shell script similar to ls, but which only lists directories. I have the first half working (no argument version), but trying to make it accept an argument, I am failing. My logic is sound I think, but I'm missing something on the syntax.
Code:
if [ $# -eq 0 ] ; then
d=`pwd`
for i in * ; do
if test -d $d/$i ; then
echo "$i:"
code....
Programming :: 3D Programming - Difference Between JOGL And C++ OpenGL Programming?
Aug 27, 2010I am interested in learning 3D programming. The thing is, I would hate to put too much effort to learn something that doesn't have future and is dying. My favorite language at the time is Java. My goal is professional programming.
So I have several questions:
1. Should I learn JOGL or start learning C++ and do C++ openGL programming?
2. Is there a big difference between JOGL and C++ openGL programming?
3. Is it worth to learn openGL? Does it have a future?
4. Is it a big difference between openGL and directX coding?
5. If choosing Java, then JOGL or LWJGL?
Why and what is the main difference between them?
Programming :: Bash: Printing The Line Number In Bash Script?
Feb 4, 2011I would like to know how do I print the line # in a script. My requirement is, I have a script which is about ~5000 lines long. If there are any errors happen I just exit. And I would like to add the line # of the script where the error happened.
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