08-01-2009
you use the "|" as a pipe in your command. but without seeing the whole code we can't help you further...
10 More Discussions You Might Find Interesting
1. Programming
How do I use the regular expressions in c++? (2 Replies)
Discussion started by: szzz
2 Replies
2. Shell Programming and Scripting
How can i create a regular expression which can detect a new line charcter followed by a special character say * and replace these both by a string of zero length?
Eg:
Input File san.txt
hello
hi ... (6 Replies)
Discussion started by: sandeep_hi
6 Replies
3. Shell Programming and Scripting
Hi,
can anyone advise me how to shorten this:
if || ; then
I tried but it dosent seem to work, whats the correct way.
Cheers (4 Replies)
Discussion started by: jack1981
4 Replies
4. UNIX for Advanced & Expert Users
Hi,
below is a piece of code written by my predecessor at work.
I'm kind of a newbie and am trying to figure out all the regular expressions in this piece of code.
It is really a tough time for me to figure out all the regular expressions.
Please shed some light on the regular expressions... (3 Replies)
Discussion started by: ramky79
3 Replies
5. Shell Programming and Scripting
Hi,
I have a file as below,
{####
if file
then
file
else
file
}
print file
i need to fine the count of all the pattern - file, inside the { }
i'm using a grep command as
grep -c \{'*file*'\} fake.sh\
It doesn't gives me any result, i think the problem here is the... (5 Replies)
Discussion started by: divak
5 Replies
6. Shell Programming and Scripting
need a regex that matches when a number has a zero (0) at the end of it
so like
10
20
120
30
330
1000
and so on (6 Replies)
Discussion started by: linuxkid
6 Replies
7. Homework & Coursework Questions
Hi,
I am newbie in shell programming and I need some help.
I had some data and I format it in a file like
dn: uid=aaaaa, dc=exmple, dc=com
cn: bbbb cccc
sn: cccc
telephoneNumber:+30-6543-123456
I have to extract the information aaaaa , bbbb, cccc and the phone number
using awk... (3 Replies)
Discussion started by: pro
3 Replies
8. Shell Programming and Scripting
Hi
Ilove unix and alwyas trying to to learn unix,but i am weak in using regular expressions.can you please give me a littel brief discription that how can i understand them and how to use .your response could lead a great hand in my unix love. (1 Reply)
Discussion started by: manoj attri
1 Replies
9. UNIX for Advanced & Expert Users
Hi All,
Can please let me know what is the difference between the single line mode and multi line mode in regular expresions?
Thanks,
Chidhambaram B (3 Replies)
Discussion started by: chidhu.anu
3 Replies
10. Shell Programming and Scripting
I need to pick a part of string lets stay started with specific character and end with specific character to replace using sed command
the line is like this:my audio book 71-skhdfon1dufgjhgf8.wav'
I want to move the characters beginning with - end before.
I have different files with random... (2 Replies)
Discussion started by: XP_2600
2 Replies
PIPE(2) BSD System Calls Manual PIPE(2)
NAME
pipe -- create descriptor pair for interprocess communication
SYNOPSIS
#include <unistd.h>
int
pipe(int fildes[2]);
DESCRIPTION
The pipe() function creates a pipe (an object that allows unidirectional data flow) and allocates a pair of file descriptors. The first
descriptor connects to the read end of the pipe; the second connects to the write end.
Data written to fildes[1] appears on (i.e., can be read from) fildes[0]. This allows the output of one program to be sent to another pro-
gram: the source's standard output is set up to be the write end of the pipe; the sink's standard input is set up to be the read end of the
pipe. The pipe itself persists until all of its associated descriptors are closed.
A pipe whose read or write end has been closed is considered widowed. Writing on such a pipe causes the writing process to receive a SIGPIPE
signal. Widowing a pipe is the only way to deliver end-of-file to a reader: after the reader consumes any buffered data, reading a widowed
pipe returns a zero count.
The generation of the SIGPIPE signal can be suppressed using the F_SETNOSIGPIPE fcntl command.
RETURN VALUES
On successful creation of the pipe, zero is returned. Otherwise, a value of -1 is returned and the variable errno set to indicate the error.
ERRORS
The pipe() call will fail if:
[EFAULT] The fildes buffer is in an invalid area of the process's address space.
[EMFILE] Too many descriptors are active.
[ENFILE] The system file table is full.
SEE ALSO
sh(1), fork(2), read(2), socketpair(2), fcntl(2), write(2)
HISTORY
A pipe() function call appeared in Version 6 AT&T UNIX.
4th Berkeley Distribution February 17, 2011 4th Berkeley Distribution