I am trying to merge two large file horizontally using paste command. Every thing is working fine except for time. Its taking lot of time.
Is there any effiecient way of doing the same thing or is there anyway by which I can improve its perfomance programatically?
Thanks,
Yeheya (1 Reply)
Hi All,
I want to merge two lines in a file till the end of the file. So what could be the command to get so.
say file name : sample.txt
contents:
country=1
send apps =1 rece=2
country=2
send apps =3 rece=3
..
...
output:
country=1;send apps =1 rece=2
country=2;send apps =3... (6 Replies)
I have 2 files
file1.txt
a 123 aqsw
c 234 sfdr
fil2.txt
b 345 hgy
d 4653 jgut
I want to merger in such a manner the the output file should be
outfile.txt
a 123 aqsw
b 345 hgy
c 234 sfdr
d 4653 jgut
Do we have any command to achive this? (8 Replies)
Hi All:
I have following files:
File 1:
<header>
text...
text ..
text ..
text ..
<\header>
x
y
z
...
File 2:
<header>
text...
text ..
text .. (4 Replies)
My file looks like this
The first 2 sequences are identical (different ID and frequencies though). The same thing for the last 2. What I need is to compare all sequences within the file and if they are identical, they need to be 'compressed' to one entry and the frequency should be recalculated.... (8 Replies)
Dear All,
I have the following input data:
w1 20 g1
w1 10 g1
w2 12 g1
w2 23 g1
w3 10 g1
w3 17 g1
w3 12.5 g1
w3 21 g1
w4 11 g1
w4 13.2 g1
w4 23 g1
w4 18 g1
First I seek to find the word frequencies in col1 and sort col2 in ascending order for each change in a col1 word. Second,... (5 Replies)
Hello,
I have a master database of a dictionary with the following structure:
a=b (b is a Unicode string)
a is the English part and b is the equivalent in a foreign language
I have also another file which has a database where the /b/ part of the string has been corrected by an expert. let us... (5 Replies)
Dear All, I have two file like this:
file1:
a1234
b1235
c4678
d7859
file2 :
e4575
f7869
g7689
h9687
I want output like this:
a1234
b1235
c4678 (2 Replies)
Our university has upgraded its version of a computational chemistry program that our group uses quite regularly. In the past we have been able to extract frequency spectra from log files that are generated. Since the upgrade, the viewing program errors out. I've been able to trace down the changes... (16 Replies)
I have this infile:
>GHL8OVD01BNNCA Freq 10
TAGATGTGCCCGTGGGTTTCCCGTCAACACCGGATAGT-GCAGCA-TA
>GHL8OVD01CMQVT Freq 1
TTGATGTCGTGGGTTTCCCGTCAACACCGGCAAATAGT-GCAGCA-TA
>GHL8OVD01CMQVT Freq 1
TTGATGTGCCAGTTTCCCGTCTAGCAGCACTACCAGGACCTTCGC-TA
>GHL8OVD01CMQVW Freq 1... (1 Reply)
Discussion started by: Xterra
1 Replies
LEARN ABOUT ULTRIX
pipe
pipe(2) System Calls Manual pipe(2)Name
pipe - create an interprocess channel
Syntax
include <limits.h> /*Definition of PIPE_MAX*/
pipe(fildes)
int fildes[2];
Arguments
fildes Passing an address as an array of two integers into the system call.
Description
The system call creates an I/O mechanism called a pipe. The file descriptors returned can be used in and operations. Their integer values
will be the two lowest available at the time of the function call. The O_NONBLOCK and FD_CLOEXEC flags will be clear on both file descrip-
tors.
When the pipe is written using the descriptor fildes[1], up to PIPE_MAX bytes of data are buffered before the writing process is suspended.
A read using the descriptor fildes[0] picks up the data.
It is assumed that after the pipe has been set up, two (or more) cooperating processes (created by subsequent calls) pass data through the
pipe with and calls.
The shell has a syntax to set up a linear array of processes connected by pipes.
For further information on how and calls behave with pipes, see the and reference pages.
A signal is generated if a write on a pipe with only one end is attempted.
Restrictions
Should more than 4096 bytes be necessary in any pipe among a loop of processes, deadlock may occur.
The underlying implementation of pipes is no longer socket based, but rather implemented through the file system. Any application that
needs socket functionality from pipes should use the system call.
Return Values
The function value zero is returned if the pipe was created; -1 if an error occurred.
Diagnostics
The call fails 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.
Environment
Differs from the System V definition in that ENFILE is not a possible error condition.
See Alsosh(1), fork(2), read(2), socketpair(2), write(2)pipe(2)