09-08-2015
hello,
just write 4 columns of raw data, like a timestamp and numbers. Yes i've tried also without it and without the pipe using just >> , again still the same.
Thank you
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
I have a script below. It get's the data from the output of a script that is running hourly. My problem is every time my script runs, it deletes the previous data and put the current data. Please see output below. What I would like to do is to have the hourly output to be appended on the... (3 Replies)
Discussion started by: ayhanne
3 Replies
2. Shell Programming and Scripting
Hi All,
I am writing a Perl script such that the output from "perl myscript.pl file1" to be appended to another file name called file2.
I tried out with the below code but couldn't work.
Can any expert give me some advice?
open(OUTPUT, 'perl myscript.pl file1 |');
close OUTPUT;... (7 Replies)
Discussion started by: Raynon
7 Replies
3. UNIX for Dummies Questions & Answers
I am running a command which has a parameter that outputs the results to a file each time it is run.
Here is the command:
--fullresult=true > importlog.xml
Can I add the output to the file rather than creating a new one which overwrites the existing one?
If not can I make the file name... (2 Replies)
Discussion started by: Sepia
2 Replies
4. UNIX for Dummies Questions & Answers
I've setup a cron job that greps a file every five minutes and then writes (appends) the grep output/result to another file:
grep "monkey" zoo.log | tail -1 >> cron-zoo-log
Is there any way I can add the date and time (timestamp) to the cron-zoo-log file for each time a new line was added?
... (12 Replies)
Discussion started by: Sepia
12 Replies
5. Shell Programming and Scripting
Hi All, can you help me with this:
grep XXX dir/*.txt|wc -l > newfile.txt - this put the results in the newfile.txt, but I want to add another column in the newfile.txt, string 'YYYYY', separated somehow, which corresponds on the grep results?
For example grep will grep XXX dir/*.txt|wc -l >... (5 Replies)
Discussion started by: apenkov
5 Replies
6. Shell Programming and Scripting
I'm trying to output the contents of the infile to the outfile using Append.
I will want to use append but the syntax doesn't seem to be working !
Input file (called a.txt) contains this:
a
a
a
b
b
b
I'm running shell script (called k.sh) from Unix command-line like this:
./k.sh .... (1 Reply)
Discussion started by: script_op2a
1 Replies
7. UNIX for Dummies Questions & Answers
Noob question!
I know almost nothing so far, and I'm trying to teach myself from books, on a typical command line without using scripts how would I append output from a sort to a file in a completely different directory?
example:
If I'm sorting a file in my documents directory but I... (2 Replies)
Discussion started by: Byrang
2 Replies
8. Shell Programming and Scripting
Hi All,
I am working on nawk script, has the small function which prints the output on the screen.Am trying to print/append the same output in a file.
Basically nawk script should print the output on the console/screen and as well it should write/append the same result to a file.
script :... (3 Replies)
Discussion started by: Optimus81
3 Replies
9. Shell Programming and Scripting
Hi All,
I have two files
File1
frame,007C1 server1_Parent
frame,007C3 server2_Silver
frame,007EE server3_Bronze
frame,00855 server4_Parent
frame,00856 server4_Parent
frame,00858 server5_Parent
frame,008FA server6_Silver
frame,008FB server6_Silver
frame,008FC server6_Silver... (2 Replies)
Discussion started by: ranjancom2000
2 Replies
10. Programming
Experts,
I am writing a script and able to write only small piece of code and not able to collect logic to complete this task.
In input file have to look for name like like this (BGL_HSR_901_1AG_A_CR9KTR10) before sh iss neors. Record this (BGL_HSR_901_1AG_A_CR9KTR10) in csv file
Now have to... (0 Replies)
Discussion started by: as7951
0 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