This may just be a lack of experience talking, but I always assumed that when possible it was better to use a commands built in abilities rather than to pipe to a bunch of commands. I wrote a (very simple) script a while back that was meant to pull out a certain error code, and report back what... (4 Replies)
Hello,
does anybody have a clue why the following code isn't working in csh:
awk 'END{print FNR-5}' x.log | awk 'FNR<$1' x.log > x2.log
I want to remove the last 5 lines of a file without using a variable.
Thanks Tim (2 Replies)
Hi!
If I'm trying something like:
echo "hello world" | myvar=`awk -F "world" '{print $1}'`
echo $myvar
myvar is always empty :confused:
I googled for houres now and don't understand why it isn't working...
Trying it in normal bash.
Can someone explain it to me so I can say "Of course!... (8 Replies)
<tr><th align=right valign=top>Faulty_Part</th><td align=left valign=top>readhat version 6.0</td></tr> <tr><th align=right valign=top>Submit_Date</th><td align=left valign=top>2011-04-28 02:08:02</td></tr> .......(a long string)
I want to get all the field between "left valign=top>" and "... (2 Replies)
Hi All. Thanks for your help in advance.
I have a requirement to examine the number of delimiters in each record of a file. If the record has the expected number of delimiters it should be passed into a 'good' file. If it does not, the record should be passed into a 'bad' file. I have been able... (8 Replies)
I need to write a script to search a static file (file1) in the form
Name Email
tim tfxo@gmail.com
bob bob@sss.com
and then mail them another file (file2) that is input from the command line.
The command line would be:
script.awk who file2 subject
and the result would be
mail -s subject who... (2 Replies)
Hey fellas,
I wrote an script which its output is like this:
a 1 T
a 1 T
a 2 A
b 5 G
b 5 G
b 5 G
I wanna print $1 $2 and the total number of $2 value as the third column and after that $3. Sth like this:
a 1 2 T
a 2 1 A
b 5 3 G
I know how to do it with a given input... (4 Replies)
Hi guys,
I need to know how i can ignore Pipe '|' if Pipe is coming as a column in Pipe delimited file
for eg:
file 1:
xx|yy|"xyz|zzz"|zzz|12...
using below awk command
awk 'BEGIN {FS=OFS="|" } print $3
i would get xyz
But i want as :
xyz|zzz to consider as whole column... (13 Replies)
In the below awk to add a sort by smallest to largest should it be added after the END? Thank you :).
BEGIN {
FS="*"
}
# Read search terms from file1 into 's'
FNR==NR {
s
next
}
{
# Check if $5 matches one of the search terms
for(i in s) {
if($5 ~ i) {
... (4 Replies)
Hello,
I need to split a pipe de-limited file based on the COLUMN 7 value . If the column value changes I need to split the file
Source File
Payment|ID|DATE|TIME|CONTROLNUMBER|NUMBER|NAME|INDICATOR
42156974|1137937|10/1/2018|104440|4232|2054391|CARE|1... (9 Replies)
Discussion started by: rosebud123
9 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)