It does not work that way. $(<file) is a special case, which is a faster alternative to $(cat file). If you are using anything other than just a file, it becomes something else. $( ... ) is just command sustitution, so if we leave out that, it becomes:
Code:
< /dev/urandom tr -dc '[:alnum:],@#:!?+-' | head -c10
This is the same as tr -dc '[:alnum:],@#:!?+-' < /dev/urandom | head -c10
Code:
cat /dev/urandom -- tr -dc '[:alnum:],@#:!?+-' | head -c10
This is strange, it effectively just means cat /dev/urandom | head -c10
Code:
cat /dev/urandom | tr -dc '[:alnum:],@#:!?+-' | head -c10
This is the same as the first one with UUOC
Code:
< /dev/urandom | tr -dc '[:alnum:],@#:!?+-' | head -c10
This is equivalent to :< /dev/urandom | tr -dc '[:alnum:],@#:!?+-' | head -c10, which is that same as : : | tr -dc '[:alnum:],@#:!?+-' | head -c10
This User Gave Thanks to Scrutinizer For This Post:
Can you use cat to send the first 25 lines of a file to the printer? I'm thinking I can pipe it with '|' but I'm not school to check printer output.
With the 'nl' used, all lines are numbered on the print out, but how does one number only the blank lines?
Thanks:) (1 Reply)
Hi,
I wnat to read a fiel line by line and store each line in a variabel, so I made a for loop:
for i in `cat file` ; do
#do sth.
done;
The problem is, that in the file, there are lines with only asterisks like this... (3 Replies)
Not sure how to do this exactly.. just want to take the first 100 lines of a file and cat it out into a second file. I know I can do a more on a file and > it into a different file, but how can I make it so only the first 100 lines get moved over? (1 Reply)
I want to cat a file with only show the line contain '/bin/bash' but don't show the line contain 'load' (don't show if the line contain 'load' and '/bin/bash' together), how to type in the command? thk a lot! (2 Replies)
I am looking for a command to take files with a specific date and cat them all into big file. I know I can use commands to list all of the files from a certain date. But I want to do that and take those files and make on large files containing all of them.
Any help would be great. This is being... (1 Reply)
Hi,
I have two files
one.txt
laptop
boy
apple
two.txt
unix
linux
OS
openS
I want to split one.txt into one line each and concatenate it with the two.txt
output files
onea.txt
laptop (4 Replies)
Hi All,
I have stumbled upon very unique issue. In my script I am doing cat file and then greping and cutting so as to assign the value to variable. My file is,
<mxc_tl_load_extractdata_prop.bsh>
DB_USER=test_oper
hostname=xxx
FTP_USER=test1_operate
MAIL_LIST=xxx@yyy.com... (1 Reply)
Hello,
I'm on a remote computer by SSH. How can I get the output of "cat file" into a file on the local computer?
I cannot use scp, because it's blocked.
something like:
ssh root@remote_maschine "cat /file" > /locale_machine/file
:rolleyes: (2 Replies)
Discussion started by: borsti007
2 Replies
LEARN ABOUT HPUX
xtappaddworkproc
XtAppAddWorkProc() XtAppAddWorkProc()
XtAppAddWorkProc - register a procedure to be called when the event loop is idle.Synopsis
XtWorkProcId XtAppAddWorkProc(app_context, proc, client_data)
XtAppContext app_context;
XtWorkProc proc;
XtPointer client_data;
Inputs
app_context
Specifies the application context.
proc Specifies the procedure that is to be called when the application is idle.
client_data
Specifies data to be passed to proc when it is called.
Returns
A handle of type XtWorkProcId that can be passed to XtRemoveWorkProc() to unregister the work procedure.
Description
XtAddWorkProc() registers the procedure proc and the data client_data to be called by XtAppNextEvent() or XtAppProcessEvent() when there
are no pending input events and it would otherwise block. Multiple work procedures can be registered, and the most recently added one is
always the one that is called. However, if a work procedure itself adds another work procedure, the newly added one has lower priority
than the current one.
A work procedure returns a Boolean. If it returns True, it will automatically be unregistered and will not be called again. If it returns
False it will be called the next time the application is idle. See XtWorkProc(2) for more information.
Usage
XtAppAddWorkProc() implements a limited form of background processing. Most applications spend most of their time waiting for input; to do
useful work during this idle time, you can register a work procedure that will run when the application is idle.
A work procedure must return quickly or the application will not be able to promptly respond to user events. If a large task needs to be
done in the background, the work procedure should periodically save its state and return False. Work procedures should not be used to do
frivolous work in the background. In a multi-tasking system, an idle application should generally actually be idle, and not steal CPU time
from other processes.
A work procedure can be explicitly removed by calling XtRemoveWorkProc() with the XtWorkProcId returned by this function.
Structures
The XtWorkProcId type is defined as follows:
typedef unsigned long XtWorkProcId;
See AlsoXtAppNextEvent(1), XtAppProcessEvent(1), XtRemoveWorkProc(1),
XtWorkProc(2).
Xt - Event Handling XtAppAddWorkProc()