i have an external device sending serial messages i want to connect this device to a serial port in my sun blade box and record those messages to a file, how can i read the serial port and write it to file?
Thanks (4 Replies)
Hi there,
It's pretty hard for me to explain my problem because I'm affraid I'm not using the correct vocabulary. So let me describe the situation. I wrote a script that has one argument. It works like this:
~$ cat /usr/local/bin/squote
echo "$@" | sed 's/'\''/'\''\\'\'\''/g; s/.*/'\''&'\''/g'... (2 Replies)
HI ,
I have a list1 which consists of data that i have to search and a list2 which has the files that need to be searched .So basically i am using list1 on list2 to see if list1 data is present if found replace it .I have written the code using foreach loop for each list .This is taking the... (1 Reply)
Q. Write a script that behaves both in interactive and non interactive mode. When no arguments are supplied it picks up each C program from the directory and prints first 10 lines.
It then prompts for deletion of the file.
If user supplies arguments with the script , then it works on those files... (1 Reply)
Q. Write a script that behaves both in interactive and non interactive mode. When no arguments are supplied it picks up each C program from the directory and prints first 10 lines.
It then prompts for deletion of the file.
If user supplies arguments with the script , then it works on those files... (8 Replies)
Hi,
I am trying to automate the killing of named processes of which I found a good solution here on the forums but as I am pretty much a begginer to linux I am having an issue. The code I found is:
kill $(ps -ef | nawk '/monitoreo start/ { print $2}'}
but what I want to do is replace... (3 Replies)
Hi UNIX Gurus,
I have a SQL utility which fires DML statements against DB2 tables. Logic is to identify DML statements, put it into a file ($dml) and execute the job.
DML file can have more than 1 DML statements....but all of 1 type at a time.....either all UPDATE or all DELETE.
Job first... (2 Replies)
Hi. I wanted to create a Perl script which can take the outputs of a Perl script as it's input and temporarily store them in a document. Need help.
Thanks.:) (8 Replies)
Need a bash script that will ask the user: Which Files Would you like to copy?
Then the user would input the filenames (space seperated, all lowercase)
The script would then cp each file to /data/backup/ and also wc the files to std output. (to see how many lines each file has)
Should go... (5 Replies)
Hi
I am trying to pass 2 input parameters from shell script to python API end point ,but not passing what i expected when print those inputs .Please advise
data.txt
" 7554317" ,xx5e1
" 7554317" ,xx96
" 7554317" ,xxd6
" 554317" ,xde
cat $sites/data.txt |sort |uniq >$sites/a.txt... (5 Replies)
Discussion started by: akil
5 Replies
LEARN ABOUT BSD
pipe
PIPE(2) System Calls Manual PIPE(2)NAME
pipe - create an interprocess communication channel
SYNOPSIS
pipe(fildes)
int fildes[2];
DESCRIPTION
The pipe system call creates an I/O mechanism called a pipe. The file descriptors returned can be used in read and write operations. When
the pipe is written using the descriptor fildes[1] up to 4096 bytes of data are buffered before the writing process is suspended. A read
using the descriptor fildes[0] will pick up the data.
It is assumed that after the pipe has been set up, two (or more) cooperating processes (created by subsequent fork calls) will pass data
through the pipe with read and write calls.
The shell has a syntax to set up a linear array of processes connected by pipes.
Read calls on an empty pipe (no buffered data) with only one end (all write file descriptors closed) returns an end-of-file.
Pipes are really a special case of the socketpair(2) call and, in fact, are implemented as such in the system.
A signal is generated if a write on a pipe with only one end is attempted.
RETURN VALUE
The function value zero is returned if the pipe was created; -1 if an error occurred.
ERRORS
The pipe call will fail if:
[EMFILE] Too many descriptors are active.
[ENFILE] The system file table is full.
[EFAULT] The fildes buffer is in an invalid area of the process's address space.
SEE ALSO sh(1), read(2), write(2), fork(2), socketpair(2)BUGS
Should more than 4096 bytes be necessary in any pipe among a loop of processes, deadlock will occur.
4th Berkeley Distribution August 26, 1985 PIPE(2)