#ifdef EXPERIMENTAL_DASH_N_OPTIMIZATION
/* If our top-level program consists solely of commands with
ADDR_IS_NUM addresses then once we past the last mentioned
line we should be able to quit if no_default_output is true,
or otherwise quickly copy input to output. Now whether this
optimization is a win or not depends on how cheaply we can
implement this for the cases where it doesn't help, as
compared against how much time is saved. One semantic
difference (which I think is an improvement) is that *this*
version will terminate after printing line two in the script
"yes | sed -n 2p".
Don't use this when in-place editing is active, because line
numbers restart each time then. */
#undef EXPERIMENTAL_DASH_N_OPTIMIZATION /*don't use -- is very buggy*/
Tomorrow will be 13 years to the day since it first appeared, only to be undefined a month later. I wonder why they didn't just yank it completely.
Code:
Tue Apr 14 17:34:54 PDT 1998 Ken Pizzini <ken@gnu.org>
* execute.c (execute_program, process_files, count_branches,
shrink_program): Added a first attempt at program optimization.
... <snip> ...
The code is all conditionally compiled based on the
EXPERIMENTAL_DASH_N_OPTIMIZATION symbol being #defined,
so it can be easily omitted if it causes problems.
Sat May 23 16:07:09 HST 1998 Ken Pizzini <ken@gnu.org>
* sed/execute.c: #undef'd EXPERIMENTAL_DASH_N_OPTIMIZATION
because its code is buggy.
Sat May 30 12:23:16 PDT 1998 Ken Pizzini <ken@gnu.org>
* sed/execute.c[EXPERIMENTAL_DASH_N_OPTIMIZATION conditional
code]: various modifications intended to keep this
code in sync with the new changes, but the code still
retains its previous bugs.
Well, at least now I know that I did not imagine it. I did see this optimization somewhere. So, long long story short, use 'q' when you know you no longer need to continue reading the input.
I have a shell script and want to assign a value to a variable. The value is the line exctrated from a file using the line number. The line number it is not fix, and could change any time.
I have tried sed, awk, head .. See my script
# Get randome line number from the file
#selectedline = `awk... (1 Reply)
Hi Everybody,
I am trying to write a script that will get some perticuler data from a file and redirect to a file.
My Question is,
I have a Very huge file,In that file I have my required data is started from 25th line and it will ends in 100th line.
I know the line numbers, I need to get all... (9 Replies)
Hello,
I am having trouble extracting a specific line from a file when the line number is known. My first attempt involved grep -n 'hi' (the word 'hi will always be there) to get the line number before the line that I actually want (line 4).
Extra Notes:
-I am working in a bash script.
-The... (7 Replies)
Hi
I want to extract certain text between two line numbers like
23234234324 and
54446655567567
How do I do this with a simple sed or awk command?
Thank you.
---------- Post updated at 06:16 PM ---------- Previous update was at 05:55 PM ----------
found it:
sed -n '#1,#2p'... (1 Reply)
Hello Everyone.
I am trying to display contains of a file from a specific line to a specific line(let say, from line number 3 to line number 5). For this I got the shell script as shown below:
if ; then
if ; then
tail +$1 $3 | head -n $2
else
... (5 Replies)
FOLKS ,
i have a text file that is generated automatically of an another korn shell script, i want to bring in the fifth line of the text file in to my korn shell script and look for a particular word in the line . Can you all share some thoughts on this one.
thanks...
Venu (3 Replies)
Dear all,
I am trying to extract a number from a line in one file (task 1), duplicate another file (task 2) and replace all instances of the strings 300, in duplicated with the extracted number (task 3). Here is what I have tried so far:
for ((k=1;k<4;k++)); do
temp=`sed -n "${k}p"... (2 Replies)
Hi,
I search all forum, but I can not find solutions of my problem :(
I have multiple files (5000 files), inside there is this data :
FILE 1:
1195.921 -898.995 0.750312E-02-0.497526E-02 0.195382E-05 0.609417E-05
-2021.287 1305.479-0.819754E-02 0.107572E-01 0.313018E-05 0.885066E-05
... (15 Replies)
I have a LOG file which looks like this
Import started at: Mon Jul 23 02:13:01 EDT 2012
Initialization completed in 2.146 seconds.
--------------------------------------------------------------------------------
--
Import summary for Import item: PolicyInformation... (8 Replies)
In the below perl code I am using tags within each line to extract certain information. The tags that are used are:
STB >0.8 is STRAND BIAS otherwise GOOD
FDP is the second number
GO towards the end of the line is read into an array and the value returned is outputed, in the first line that... (1 Reply)
Discussion started by: cmccabe
1 Replies
LEARN ABOUT MOJAVE
line
line(1) User Commands line(1)NAME
line - read one line
SYNOPSIS
line
DESCRIPTION
The line utility copies one line (up to and including a new-line) from the standard input and writes it on the standard output. It returns
an exit status of 1 on EOF and always prints at least a new-line. It is often used within shell files to read from the user's terminal.
EXIT STATUS
Exit status is:
0 Successful completion
>0 End-of-file on input.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO sh(1), read(2), attributes(5)SunOS 5.10 1 Feb 1995 line(1)
04-13-2011
