I am trying to use Matlab to send commands to FWTools in order to project a bunch of .shp files.
I am able to start FWTools from Matlab but I cant figure out how to send it commands without my interaction.
So far FWTools starts and my matlab command window and acts like the FWTools shell. I type commands and it will run, but I want to be able to send them in my .m file. Once FWTools starts up, my script will not continue to the next line of code.
My code so far:
cmd = 'ogr2ogr -s_srs "EPSG:4326" -t_srs "EPSG:3006" out_sweref99tm.shp in_wgs84.shp';
system('C:\Windows\system32\cmd.exe \K "d:\FWTools2.4.7\setfw.bat" ')
sprintf('%s',cmd) % try to send cmd to matlab command window aka FWTools
I also tried to put the cmd into my system call but that returned an error since it appears that I am trying to call FWTools with a super long string afterwards :(
cmd = 'ogr2ogr -s_srs "EPSG:4326" -t_srs "EPSG:3006" out_sweref99tm.shp in_wgs84.shp';
system(['C:\Windows\system32\cmd.exe \K "d:\FWTools2.4.7\setfw.bat" ',cmd])
The reason I am using FWTools is that I am projecting from WGS84 to SWEREF99TM and (from my understanding) its not easy to get the final projection via Matlab's mapping toolbox. Please correct me if I am wrong as I would love to keep it to Matlab.
And if possible, I would like to stay in Matlab and not move to Python.
Thanks.
Norris
The call of C:\Windows\system32\cmd.exe is not necessary.
Try this:
cmd = 'ogr2ogr -s_srs "EPSG:4326" -t_srs "EPSG:3006" out_sweref99tm.shp in_wgs84.shp';
system(['d: && cd d:\FWTools2.4.7\ && setfw.bat ',cmd])
or if you actually need to pass your parameters after the first call and not with:
system(['d: && cd d:\FWTools2.4.7\ && setfw.bat && ',cmd])
Maybe you can post a screenshot of how it looks like when you do it manually.
requested explanation:
The && operator is implicating that the following command is executed "in the next line". It's like you press enter in the cmd window and then you have to type the next command.
For example cd d:\FWTools2.4.7\ does never work directly, as the default is usually "c:". So firstly have to type d: and in the next step you change to your folder cd d:\FWTools2.4.7\
Related
-- Edit : Resolved. See answer.
Background:
I'm writing a shell that will perform some extra actions required on our system when someone resizes a database.
The shell is written in ksh (requirement), the OS is Solaris 5.10 .
The problem is with one of the checks, which verifies there's enough free space on the underlying OS.
Problem:
The check reads the df -k line for root, which is what I check in this step, and prints it to a file. I then "read" the contents into variables which I use in calculations.
Unfortunately, when I try to run an arithmetic operation on one of the variables, I get an error indicating it is null. And a debug output line I've placed after that line verifies that it is null... It lost it's value...
I've tried every method of doing this I could find online, they work when I run it manually, but not inside the shell file.
(* The file does have #!/usr/bin/ksh)
Code:
df -k | grep "rpool/ROOT" > dftest.out
RPOOL_NAME=""; declare -i TOTAL_SIZE=0; USED_SPACE=0; AVAILABLE_SPACE=0; AVAILABLE_PERCENT=0; RSIGN=""
read RPOOL_NAME TOTAL_SIZE USED_SPACE AVAILABLE_SPACE AVAILABLE_PERCENT RSIGN < dftest.out
\rm dftest.out
echo $RPOOL_NAME $TOTAL_SIZE $USED_SPACE $AVAILABLE_SPACE $AVAILABLE_PERCENT $RSIGN
((TOTAL_SIZE=$TOTAL_SIZE/1024))
This is the result:
DBResize.sh[11]: TOTAL_SIZE=/1024: syntax error
I'm pulling hairs at this point, any help would be appreciated.
The code you posted cannot produce the output you posted. Most obviously, the error is signalled at line 11 but you posted fewer than 11 lines of code. The previous lines may matter. Always post complete code when you ask for help.
More concretely, the declare command doesn't exist in ksh, it's a bash thing. You can achieve the same result with typeset (declare is a bash equivalent to typeset, but not all options are the same). Either you're executing this script with bash, or there's another error message about declare, or you've defined some additional commands including declare which may change the behavior of this code.
None of this should have an impact on the particular problem that you're posting about, however. The variables created by read remain assigned until the end of the subshell, i.e. until the code hits a ), the end of a pipe (left-hand side of the pipe only in ksh), etc.
About the use of declare or typeset, note that you're only declaring TOTAL_SIZE as an integer. For the other variables, you're just assigning a value which happens to consist exclusively of digits. It doesn't matter for the code you posted, but it's probably not what you meant.
One thing that may be happening is that grep matches nothing, and therefore read reads an empty line. You should check for errors. Use set -e in scripts to exit at the first error. (There are cases where set -e doesn't catch errors, but it's a good start.)
Another thing that may be happening is that df is splitting its output onto multiple lines because the first column containing the filesystem name is too large. To prevent this splitting, pass the option -P.
Using a temporary file is fragile: the code may be executed in a read-only directory, another process may want to access the same file at the same time... Here a temporary file is useless. Just pipe directly into read. In ksh (unlike most other sh variants including bash), the right-hand side of a pipe runs in the main shell, so assignments to variables in the right-hand side of a pipe remain available in the following commands.
It doesn't matter in this particular script, but you can use a variable without $ in an arithmetic expression. Using $ substitutes a string which can have confusing results, e.g. a='1+2'; $((a*3)) expands to 7. Not using $ uses the numerical value (in ksh, a='1+2'; $((a*3)) expands to 9; in some sh implementations you get an error because a's value is not numeric).
#!/usr/bin/ksh
set -e
typeset -i TOTAL_SIZE=0 USED_SPACE=0 AVAILABLE_SPACE=0 AVAILABLE_PERCENT=0
df -Pk | grep "rpool/ROOT" | read RPOOL_NAME TOTAL_SIZE USED_SPACE AVAILABLE_SPACE AVAILABLE_PERCENT RSIGN
echo $RPOOL_NAME $TOTAL_SIZE $USED_SPACE $AVAILABLE_SPACE $AVAILABLE_PERCENT $RSIGN
((TOTAL_SIZE=TOTAL_SIZE/1024))
Strange...when I get rid of your "declare" line, your original code seems to work perfectly well (at least with ksh on Linux)
The code :
#!/bin/ksh
df -k | grep "/home" > dftest.out
read RPOOL_NAME TOTAL_SIZE USED_SPACE AVAILABLE_SPACE AVAILABLE_PERCENT RSIGN < dftest.out
\rm dftest.out
echo $RPOOL_NAME $TOTAL_SIZE $USED_SPACE $AVAILABLE_SPACE $AVAILABLE_PERCENT $RSIGN
((TOTAL_SIZE=$TOTAL_SIZE/1024))
print $TOTAL_SIZE
The result :
32962416 5732492 25552588 19% /home
5598
Which are the value a simple df -k is returning. The variables seem to last.
For those interested, I have figured out that it is not possible to use "read" the way I was using it.
The variable values assigned by "read" simply "do not last".
To remedy this, I have applied the less than ideal solution of using the standard "while read" format, and inside the loop, echo selected variables into a variable file.
Once said file was created, I just "loaded" it.
(pseudo code:)
LOOP START
echo "VAR_A="$VAR_A"; VAR_B="$VAR_B";" > somefile.out
LOOP END
. somefile.out
Using fish shell, I'm writing very simple script that checks the command execution
#!/usr/bin/fish
command
if $status
echo "Oops error"
else
echo "Worked OK"
#...
end
And get the error message:
fish: Variables may not be used as commands. Instead, define a function like “function status; 0 $argv; end”. See the help section for the function command by typing “help function”.
The message looks pretty straight forward but no "defining function like..." nor "help function" helps solving the problem.
There is also a 'test' command, that sounds promising. But docs say it is to be used to check files...
How this simple thing should be done with fish shell?
Heh... And why all documentation is SO misleading?..
P.S. Please, don't write about 'and' command.
Fish's test command currently works exactly like POSIX test (i.e. the one you'll find in bash or similar shells). It has a couple of operations, including "-gt", "-eq", "-lt" to check if a number is bigger, equal or less than another number, respectively.
So if you want to use test, you'll do if test $status -eq 0 (a 0 traditionally denotes success). Otherwise, you can check the return value of a command by putting it in the if clause directly like if command (which will be true if the command returns 0) - that's what fish is trying to do here, which is why it complains about a variable being used in place of a command.
In Perl script I am using command of unit(external command) using system
but that command need some run time input from user. Every time I want to give similar input which is stored in variable.
My command is:
system("dt ci $dest_file");
after this command my script is waiting for user input,
lets say I want to give "re base" as input to this every time
How can I give fix input every time it asks?
Please help, I am working on windows 7.
I want to make script completely automated... it should not wait for user input
If you call your script like this:
perl test.pl < input.txt
It should take the content of the file as an input. ( this is working with STDIN read )
I have a matlab file that takes in a file. I would like to run that program in the matlab shell, such as prog. I need to implement it so that it takes a number of arguments, such as "prog filename.txt 1 2 which would mean that i can use filename.txt and 1 2 as variables in my program.
Thank you!
In order to make a script accept arguments from the command line, you must first turn it into a function that will get the arguments you want, i.e if your script is named prog.m, put as the first line
function []=prog(arg1, arg2)
and add an end at the end (assuming that the file has only one function). It's very important that you call the function the same name as the file.
The next thing is that you need to make sure that the script file is located at the same place from where you call the script, or it's located at the Matlab working path, otherwise it'll not be able to recognize your script.
Finally, to execute the script you use
matlab -r "prog arg1 arg2"
which is equivalent to calling
prog(arg1,arg2)
from inside Matlab.
*- tested in Windows and Linux environments
Once your function is written in a separate file, as discussed by the other answer you can call it with a slightly more complicated setup to make it easier to catch errors etc.
There is useful advice in this thread about ensuring that Matlab doesn't launch the graphical interface and quits after finishing the script, and reports the error nicely if there is one.
For example:
matlab -nodisplay -nosplash -r "try, prog(1, 'file.txt'), catch me, fprintf('%s / %s\n',me.identifier,me.message), exit(1), end, exit(0)"
The script given to Matlab would read as follows if line spaces were added:
% Try running the script
try
prog(1, 'file.txt')
catch me
% On error, print error message and exit with failure
fprintf('%s / %s\n',me.identifier,me.message)
exit(1)
end
% Else, exit with success
exit(0)
I have a matlab function and I was able to run it from command line. Now I want to pass a parameter to the file from command line. The parameter is a integer. It seems when I pass from command line, it is always taken as a "char".
Here is how I run the command
matlab -nodesktop -nosplash -r "mycommand 3"
For example, if I have a function as
function [ ] = mycommand( a )
a = a+3;
disp(a)
end
it prints 54 instead of 6.
Is there a way to work around this? I don't want to check the type of the variable in my code.
Thanks
You need to execute the function as you would in the matlab interpreter:
matlab -nodesktop -nosplash -r "mycommand(3)"
(Notice the parenthesis around the 3)
MarkD gave a good answer. Although you mentioned you might be unhappy doing this (I'm sure for good reasons), another option would be to put a little extra code in to the beginning of your function, which would convert character inputs to numerical if the command were called via matlab -r:
if ischar(a)
a = str2num(a);
end