'cat file' but only if 'file' existI'm trying to run 'cat *.x' only if *.x files exist. What is the
cleanest way of doing this? I'm doing it by
shopt -s nullglob
for i in *.x; do cat $i; done
but this is aweful typing.
--
William Park, Open Geometry Consulting, <opengeometry@yahoo.ca>
No, I will not fix your computer! I'll reformat your harddisk, though.
On 2004-06-09, William Park wrote:
> I'm trying to run 'cat *.x' only if *.x files exist. What is the
> cleanest way of doing this? I'm doing it by
> shopt -s nullglob
> for i in *.x; do cat $i; done
...
'is not' or '!='A newbie question to you; what is the difference between statements
like:
if x is not None:
and
if x != None:
Without any context, which one should be preferred?
IMHO, the latter is more readable.
On 2014-08-18 21:35, ElChino wrote:
> A newbie question to you; what is the difference between statements
> like:
> if x is not None:
> and
> if x != None:
>
> Without any context, which one should be preferred?
> IMHO, the latter is more readable.
>
"x == y" tells you whether x and y refer to objects that are equal.
"x is y" tells you whether x and y actually refer to the same object.
In the case of singletons like None (there's only one None object),
it's better to use "is".
"ElChino" <elchino@cnn.cn>:
> A newbie question to you; what is the difference between statements
> like:
> if x is not None:
> and
> if x != None:
Do the following: take two $10 bills. Hold one bill in the left hand,
hold the other bill in the right hand.
Now, the bill in the left hand "is not" the bill in the right hand.
However, the bill in the left hand "==" the bill in the right hand.
> Without any context, which one should be preferred?
> IMHO, the latter is more readable.
In almost all cases, both tests would result in the same behavior.
However, the "is not" test is conceptually the correct one since you
want...
'^=' and '~='?Hello,
What is the difference between '^=' and '~='?
Thanks,
Duckhye
...
'YScale','log',I would like to convert a graph from linear y-axis, to a
logarithmic y-axis. However, once that is done, one of the
vertical lines (which I use to indicate the required point)
disappears. See the image below:
http://img517.imageshack.us/img517/4937/weirdak0.jpg
My plotting code:
figure1 = figure('Color',[0.8 0.8 0.8]);
axes('Parent',figure1,'YScale','log','YMinorTick','on','YMinorGrid','on',...
'FontSize',8,...
'FontName','Verdana');
xlim([1 2.2]);
ylim([0 1000]);
box('on');
grid('o...
``awk '!a[$0]++' file'' and ``awk '{if(!($0 in rec)) {rec[$0]=1; print $0;}}' file ''Hi all,
Currently, I'm reading the book on awk programming language, but meet the
following two examples which I cann't understand so well:
awk '!a[$0]++' file
and
awk '{if(!($0 in rec)) {rec[$0]=1; print $0;}}' file
Could someone here please give me some hints or explanations on the logic
of above codes?
Regards
--
..: Hongyi Zhao [ hongyi.zhao AT gmail.com ] Free as in Freedom :.
In article <meuejm$gsf$1@aspen.stu.neva.ru>,
Hongyi Zhao <hongyi.zhao@gmail.com> wrote:
> Hi all,
>
> Currently, I'm reading the bo...
Problem of 'set(gca, 'yscale', 'log')'I used the following code to plot F. Everything went well until the last line was executed. The warning message 'Warning: Negative data ignored' popped up and the image totally went wrong. I double-checked the values of 'd' and was pretty sure that it was greater than 0.
Would anybody please help me figure this out? Thank you very much!
N = 1000;
t = 3e-9;
d = 0.0001:0.01:1;
w = logspace(-3, 1, 101)/t;
[D, W] = meshgrid(d, w);
S = sqrt((D.*((2*pi./W).^2+4*(pi*t)^2).^2.*(2*pi*D.*...
((2*pi./W).^4+20*((2*pi./W)*pi*t).^2+64*(pi*t)^4)-(2*pi./W).^2.*((2...
web('file', 'filename' '-browser') not workingHello,
I'm working on a project involving Matlab and a nice flashy GUI. To
call help files, I do:
web('file', 'help.html' '-browser');
On my computer, this works. After compiling it, it works. If I
manage to get the current directory wrong, somehow, the browser
attempts to go to www.help.com, rather than put up an error. So far
so good, except when the file isn't there, which I'm ignoring for the
moment.
However, when I run the program on other computers (I compile the
program first), it always goes to www.help.com, no matter what the
pwd says, or where I put help.html. This seems to happen on about
half of the other computers I try it on.
Any ideas? I had thought it was just path mixups but putting 'pwd'
in the appropriate places seems to indicate nothing is amiss. I do
not want to use explicit path names, (ie 'file:///c:/stuff/help.html'
syntax) as this program is meant for some distribution and I can't
guarantee that people will always have it running from the same
location.
Thank you in advance,
--Anne
I finally did
a = sprintf('file:///%shelp.html#%s', pwd, section);
web('file', a, '-browser');
I discovered that the file:/// syntax does not require paths to be
deliminated by '/' but can use '\' unlike what I had thought.
I read a bug report that using the internal web browser crashes when
using compiled code. However, a similar crash happens for me when
using R2006a....
'''''''''''''The Running Update/Append Queries Using VBA code Ordeal''''''''''''''Hello fellow programmers,
I am trying to run an append/update query from code, a command button
on a form initiates the queries.
the format i am using is;
_____________________________________________________
SELECT "criteria"
FROM "criteria"
WHERE "criteria"
UPDATE/APPEND "field selections"
RecordSource "qryExample" = above text strings"
_______________________________________________________________________
When i am running a SELECT query in this manner it works fine with no
problems, and accepts the values of specified linked for...
exist('fname','file')Hello
I have a file 'fname' in one of the directories under the matlabpath.
the file was saved by the SAVE function.
when I
exist('fname','file')
ans =
0
why it is not showing 2 since it exists?
I also tried the full path name of the file,
thanks
Is the filename actually 'fname'? Or is the filename stored in the
fname variable? Or is there an extension? (i.e. fname.mat) Is it
in a different directory?
If fname is a variable, you need to leave off the quotes:
exist(fname,'file')
If it has an extension, you need to put that on:
e...
Difference between a 'file' and a 'table'
With OS400, all files are objects that can be accessed relationally.
When I view the file system from Navigator (windows client), I see there is
the Database and SQL tables, then there is the filesystem.
I can manipulate both these objects (tables, files) with SQL.
So, what is the difference between a table and a file?
--
Texeme
http://texeme.com
Without being strict in its definition a file and a table in OS/400 are the
same. If you go into object types you will find that there is a Type *FILE
and a Type *TBL, maybe I will ask the next question, what is the difference ...
'to file' and 'to workspace' helpI have a model that runs a 4 degrees of freedom robot here, right now I am only working with rotating the robot though. I have the model using a repeating sequence stair block as an input, this waits 10 seconds spins 5 degrees waits 10 secs spins 5 more degrees all the way up to 360 then i have a stop simulation block that stops the simulation once it has reached 360. The model works perfectly for my purpose, but in my feedback loop that reads my encoder position i am trying to insert a to file or to workspace block so that i can keep track of the encoder readings while the robot is stopped ...
'''''''''''''The Running Update/Append Queries Using VBA code Ordeal'''''''''''''' #2Hi,
Thanks for ur help there HJ.
I know how to do the tasks you specified there.
I would like for the update query to use field values from some of the
fields on the form (frmInvoices) such as InvoiceNumber, DateFrom,
DateTo. My problem is that an append/update query can't find the
values in the open Form (frmInvoices) when I specify them as;
[Forms]![frmInvoices]![InvoiceNumber]
a select query has no problem finding the field values on a form.
please help.
Aaron
Hi Aaron,
Could you post the entire code that you are having trouble with? Now it is
not possible to see what goes wrong.
HJ
"Aaron" <aaron@rapid-motion.co.uk> wrote in message
news:260d7f40.0408120245.2f3d01f8@posting.google.com...
> Hi,
>
> Thanks for ur help there HJ.
>
> I know how to do the tasks you specified there.
>
> I would like for the update query to use field values from some of the
> fields on the form (frmInvoices) such as InvoiceNumber, DateFrom,
> DateTo. My problem is that an append/update query can't find the
> values in the open Form (frmInvoices) when I specify them as;
>
> [Forms]![frmInvoices]![InvoiceNumber]
>
> a select query has no problem finding the field values on a form.
>
> please help.
>
> Aaron
First off, if you are not always using all the parameters specified in
your form, then you have to add parameters to your query on the fly.
Also, you can't just do something like
qdf.SQL = "SE...
if str_mo not in ('','.') and str_da not in ('','.') and str_yy not in ('','.') Any shorter ?Hi, there.
=20
I'm just curious if it ever dawned on anybody how to abbreviate this
line :
if str_mo not in ('','.') and str_da not in ('','.') and str_yy not in
('','.')=20
=20
Igor Kurbeko
Clinical Programmer Analyst
678 336 4328
ikurbeko@atherogenics.com
=20
no brain no pain
=20
how about:
if not (str_mo in ('','.') or str_da in ('','.') or str_yy in
('','.'))
OR
if not (missing(str_mo) or missing(str_da) or missing(str_yy))
Eric
On 22 Oct 03 21:13:37 GMT, ikurbeko@ATHER...
Tuning 'log file sync'One of our database experiences heavy waits on 'log file sync'.
Top waits from V$SYSTEM_EVENT are given below. 'Log file sync'
exceeds 'db file sequential read' and 'db file scattered read'.
Metalink Note 223117.1 says that they key to understanding
'log file sync' is to compare average times waited for 'log file sync'
and 'log file parallel write': if they are similar then
it is I/O problem, but if they are different then "the delay is
caused by the other parts of Redo Logging mechanism
that occur during a COMMIT/ROLLBACK (and are n...
'Adding new data file' vs 'extending existing data file size' to increase TablespaceAs the Tablespace is almost filled on the running system now, we have
to add additional space to the Tablespace.
As I understand, the following are the two options available to do
that:
1)
Add a new data file to hold the additional data in Tablespace:
SQL> alter tablespace my_TS add datafile '/someDir/my_TS2.dbf' size
100M;
2)
Resize the existing Tablespace's data file.
SQL> alter database datafile '/someDir/my_TS1.dbf' resize 200M;
What is the best way to go?
In my understanding, the 1st option is not preferable as the
Tablespace is spread over 2 data files and ...
Gui having an 'open file window' and a 'save file window'Is it possible to click on a button in the gui and have a
Windows-like window where I can select the file to open and another
like when you click on 'save as'?
Thank you very much
nathaniel zoso wrote:
> Is it possible to click on a button in the gui and have a
> Windows-like window where I can select the file to open and another
> like when you click on 'save as'?
>
> Thank you very much
Check out the UIGETFILE and UIPUTFILE functions, respectively.
-SteveSimon
...
change 'file name' in 'From Multimedia File' simulink blockI need to load a avi video into workspace and do some processing work. I use the 'From Multimedia File' block in simulink to extract the audio of the avi file.
The question is that if for different avi files, i have to manually set the 'file name' of the 'From Multimedia File' everytime before start the simulation.
I can read the avi file in a .m file and get the path name and filename first. Is that possible to send these path name and filename automatically to the 'file name' in 'From Multimedia File' block when the avi file is loaded?
thx a lo...
Is 'du -b file' equivalent to 'wc -c file'?Hi all,
It seems that both 'du -b file' and 'wc -c file' can give the correct
bytes count on the file. Are they equivalent for all case on this type of
job?
Regards
--
..: Hongyi Zhao [ hongyi.zhao AT gmail.com ] Free as in Freedom :.
On 2015-05-22, Hongyi Zhao <hongyi.zhao@gmail.com> wrote:
> Hi all,
>
> It seems that both 'du -b file' and 'wc -c file' can give the correct
> bytes count on the file. Are they equivalent for all case on this type of
> job?
>
> Regards
There's no -b switch for du on my system (Mac OS X 10.10.3), and it's
not in POSIX. The -c switch for wc is however standard, so use that
instead.
Note that you will have to use -m with wc to always get the correct
number of *characters* in a file.
--
:: Andreas Kusalananda Kahari, Uppsala University, Sweden ::
:: a n d r e a s . k a h a r i @ i c m . u u . s e ::
On Fri, 22 May 2015 06:52:32 +0000, Kusalananda wrote:
> There's no -b switch for du on my system (Mac OS X 10.10.3),
I can find the following for my case manpage of du:
-b, --bytes
equivalent to '--apparent-size --block-size=1'
--apparent-size
print apparent sizes, rather than disk usage; although the apparent
size is usually smaller, it may be larger due to holes in ('sparse')
files, internal fragmentation, indirect blocks, and the like
-B, --block-size=SIZE
scale sizes by SIZE befo...
Fetch the newest file containing the string 'fgractg*.log' in the filename and contains the string 'ORA-' in itHello, I posted a message a month ago and I still have the same
questions unresolved. I hope I am clear in my question.
I am trying to develop a shell script that checks whether the newest
file modified today that contains the string 'fgractg*.log' in the
filename ALSO contains the string 'ORA-' in the file and if so, it
gives the name of the file. I have this from someone else andd it also
has syntax errors and does not work for me.
fgractg_check=`
ls -ltr fgractg*\.log | grep "`date +'%b %e'" |
sed "s/.* \(fgractg*\.log\)$/grep -l 'fgractg...
A function with 'and' , 'not' , 'null' , 'car' and 'cdr'What's this ?
(defun enigma (x)
(and (not (null x))
(or (null (car x))
(enigma (cdr x)))))
"I suppose I should learn Lisp, but it seems so foreign."
- Paul Graham, Nov 1983
On Wed, Oct 07 2015, CAI GENGYANG wrote:
> What's this ?
>
>
> (defun enigma (x)
> (and (not (null x))
> (or (null (car x))
> (enigma (cdr x)))))
Bad taste? It returns T if the list X contains nil as an element. It
would be clearer to write (some #'null x).
Helmut
CAI GENGYANG ...
Issue with the 'script' command in users '.kshrc' and '.bashrc' filesI am attempting to monitor users actions by using the following
'script' command:
# exec script -a /tmp/${LOG}
In order to capture all types of login whether 'telnet', su, su - etc
etc I have put it into the .profile, .dtprofile and the *rc shell
files. This works fine for CSH and SH, however if I launch another
session (dtterm &) or switch shell to either KSH or BASH, then it
seems to spin round and attempt to infinately create fresh 'script'
sessions until I quit out. Example below:
Script started, file is /tmp/x
Script started, file is /tmp/x
Script started,...
Re: if str_mo not in ('','.') and str_da not in ('','.') and str_yy not in ('','.') Any shorter ?OR
you could use ARRAY
data new;
set old;
array igor $ (*) str_mo str_da str_yr;
do over igor;
if igor ~in (' ','.') then do;
end;
run;
Prasad Ravi
Igor Kurbeko
<ikurbeko@ATHEROGENIC To: SAS-L@LISTSERV.UGA.EDU
S.COM> cc:
Sent by: "SAS(r) Subject: if str_mo not in ('','.') and str_da not in ('','.') and str_yy
...
error: expected '=', ',', ';', 'asm' or '__attribHi
I'm trying to compile an ADC Driver & come acrosss the following error.
I've no experience writing drivers before, and hence have no clue how
to fix it.
Hope someone out there has encountered the problem & suggesst a fix for
the same.
The Error is I get is :
qadc.c: At top level:
qadc.c:97: error: expected '=', ',', ';', 'asm' or '__attribute__'
before 'qadc_read'
make: *** [qadc.o] Error 1
[root@localhost qadc]#
###########################################################################
ADC Driver Code
###########################################################################
#define MODULE
#define __KERNEL__
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h> /* printk */
#include <linux/fs.h> /
#include <linux/errno.h> /* error codes */
#include <linux/types.h> /* size_t */
#include <linux/proc_fs.h> /* proc file system */
#include <linux/fcntl.h>
#include <asm/system.h> /* cli, flags */
#include <asm/uaccess.h> /* copy from/to user */
/*Registers to get qadc access*/
volatile unsigned short * qadcmcr = (unsigned short *)0x40190000;
volatile unsigned short * qacr0 = (unsigned short *)0x4019000a;
volatile unsigned short * qacr1 = (unsigned short *)0x4019000c;
volatile unsigned short * qacr2 = (unsigned short *)0x4019000e;
volatile unsigned short * qasr0 = (unsigned short *)0x40190010;
volatile unsigned short * qasr1...
error: expected '=', ',', ';', 'asm' or '__attribHi
I'm trying to compile an ADC Driver & come acrosss the following error.
I've no experience writing drivers before, and hence have no clue how
to fix it.
Hope someone out there has encountered the problem & suggesst a fix for
the same.
The Error is I get is :
qadc.c: At top level:
qadc.c:97: error: expected '=', ',', ';', 'asm' or '__attribute__'
before 'qadc_read'
make: *** [qadc.o] Error 1
[root@localhost qadc]#
###########################################################################
ADC Driver Code
##...