Like many features, pretty but not fast, so you avoid them for heavy lifting if possible, but sometimes you need them even when they are slower.
Of course, if the user wanted to trim leading and trailing, these 4 would run fast, but the ones searching for space first should go last, s sed works his reges left to right, so it is best to have a selective string on the left end (I guess an Arabic/Hebrew language sed would work right to left?):
Code:
sed '
s/^ *//
s/, */,/
s/ *,/,/
s/ *$//
'
---------- Post updated at 04:08 PM ---------- Previous update was at 04:00 PM ----------
Quote:
Originally Posted by ctsgnb
Maybe the parsing Step, indeed, when ambiguous grouping is specified, it goes through a kind of "auto completion" step.
Also maybe using a memory copy instead of a memory mapping?.
Early sed had a limited line size, and was faster with less indirection, but gnu sed and later sed's seem to have very big or realloc()'d buffers. I don't think many programmers use a mmap()'d tmp file for the buffer. Sed is a pipe-oriented stream editor, so it would not be able to map the input file all the time, and even so, it could not write there, and of course it needs to scan intermediate product on multi-command scripts. So, I am not thinking memory map and sed at the same time. I suspect as it rewrites a line, it has an input pointer and an output pointer, and if the line is expanding, then when the pointers collide, there must be either mid-substitute moves in one buffer or copying between two buffers. I am not going to read the code, though!
Hello Awk Gurus,
Can anyone of you help me with the below problem. I have got a file having data in below format
pmFaultyTransportBlocks
-----------------------
9842993
pmFrmNoOfDiscRachFrames
-----------------------
NULL
pmNoRecRandomAccSuccess
-----------------------... (4 Replies)
Hi guys
task removing the last commas of 5th and 6th columns. The bug in the script is causing effect because of whitespaces around commas. I tried to delete white spaces first and running the above script. but still some where getting the results wrong.
I already have a script to do this... (12 Replies)
1. The problem statement, all variables and given/known data:
Problem Statement for project:
When an account is created on the CS Unix network, a
public html directory is created in the account's home directory. A default web page is put into that directory.
Some users replace or... (13 Replies)
Hi all,
I have a conf file, i want to update some entries in that conf file. Below is the code for that using a temporary file.
sed '/workgroup=/ c\workgroup=Workgroup' /usr/local/netx.conf > /usr/local/netx.conf.tmp
mv -f /usr/local/netx.conf.tmp /usr/local/netx.conf
Sample contents of... (9 Replies)
I have two files which I would like to compare and then manipulate in a way.
File1:
pictures.txt 1.1 1.3
dance.txt 1.2 1.4
treehouse.txt 1.3 1.5
File2:
pictures.txt 1.5 ref2313 1.4 ref2345 1.3 ref5432 1.2 ref4244
dance.txt 1.6 ref2342 1.5 ref2352 1.4 ref0695 1.3 ref5738 1.2... (1 Reply)
Hello,
i have a file, i open the file and read the line, i want to get the first item in the csv file and also teh third+6 item and wirte it to a new csv file. only problem is that using echo it takes TOO LONG:
please help a newbie. below is my code:
WorkingDir=$1
FileName=`cut -d ',' -f... (2 Replies)
Hello all, I need some help with sed. seems like i cant get through it. So here is what i am trying. when i do ps -ef|grep bla blah ...like below...i get /u01/app/oracle/11g/bin/tnslsnr .... but i want to replace that string with something using sed. So basically i want to get rid of... (3 Replies)
With sed
1. I need to find a line that contains "DVM" and "73069".
2. I need to insert a double quote at the beginning of the first line of the file.
These two have been driving me crazy for the last 45 minutes. Any help would be greatly appreciated.
Thanks (3 Replies)
HI All,
I am new to unix. I have a file would like to do some editing by using awk, cut and sed. Could anyone help?
This file contain 100 lines. There are one line for example:
2,"102343454",5060,"579668","579668","579668","SIP",,,"825922","035885221283026",1,268,"00:59:00.782 APR 17... (2 Replies)
{
"AFafa": "FAFA","AFafa": "FAFA"
"baseball":"soccer","wrestling":"dancing"
"rhinos":"crocodiles","roles":"foodchain"
}
I need to insert a new line before the closing brackets "}" so that the final output looks like this:
{
"AFafa": "FAFA","AFafa": "FAFA"... (6 Replies)
Discussion started by: SkySmart
6 Replies
LEARN ABOUT REDHAT
nwbpset
NWBPSET(1) nwbpset NWBPSET(1)NAME
nwbpset - Create a bindery property or set its value
SYNOPSIS
nwbpset [ -h ] [ -S server ] [ -U user name ] [ -P password | -n ] [ -C ]
DESCRIPTION
nwbpset Reads a property specification from the standard input and creates and sets the corresponding property. The format is determined by
the output of 'nwbpvalues -c'. nwbpset will hopefully become an important part of the bindery management suite of ncpfs, together with
As another example, look at the following command line:
nwbpvalues -t 1 -o supervisor -p user_defaults -c |
sed '2s/.*/ME/'|
sed '3s/.*/LOGIN_CONTROL/'|
nwbpset
With this command, the property user_defaults of the user object 'supervisor' is copied into the property login_control of the user object
'me'.
nwbpvalues -t 1 -o me -p login_control -c |
sed '9s/.*/ff/'|
nwbpset
This command disables the user object me.
Feel free to contribute other examples!
nwbpset looks up the file $HOME/.nwclient to find a file server, a user name and possibly a password. See nwclient(5) for more information.
Please note that the access permissions of $HOME/.nwclient MUST be 600 for security reasons.
OPTIONS -h
-h is used to print out a short help text.
-S server
server is the name of the server you want to use.
-U user
user is the user name to use for login.
-P password
password is the password to use for login. If neither -n nor -P are given, and the user has no open connection to the server, nwbpset
prompts for a password.
-n
-n should be given if no password is required for the login.
-C
By default, passwords are converted to uppercase before they are sent to the server, because most servers require this. You can turn off
this conversion by -C.
AUTHORS
nwbpset was written by Volker Lendecke. See the Changes file of ncpfs for other contributors.
nwbpset 8/7/1996 NWBPSET(1)
11-02-2010
