10 More Discussions You Might Find Interesting
1. UNIX for Beginners Questions & Answers
I have requirement to search for a text in the file and retrieve required lines that is user defined with unix command.
Eg:
Find the text UNIX in the below file and need to return Test 8 & Test 9
Test 1
Test 2
Test 3
Test 4
UNIX
Test 5
Test 6
Test 7
Test 8
Test 9
Result can... (8 Replies)
Discussion started by: Arunkumarsak4
8 Replies
2. Shell Programming and Scripting
Hi Firends,
I wanted to extract the first record of the file which starst with character say "X". And I tried an awk command which works when i try to execute it individually:
awk 'substr($1,1,1)=="X"' inputfile.txt
But when I use the same command in my script for which I am passing the... (2 Replies)
Discussion started by: Ajay Venkatesan
2 Replies
3. Shell Programming and Scripting
My data is something like shown below.
date1 date2 aaa bbbb ccccc
date3 date4 dddd eeeeeee ffffffffff ggggg hh
I want the output like this
date1date2 aaa eeeeee
I serached in the forum but didn't find the exact matching solution. Please help. (7 Replies)
Discussion started by: rdhanek
7 Replies
4. Cybersecurity
Hi,
I am trying to write a script which would figure out who has run which command and their IP. As i dont have any clue as to which commands would do this job, i request some gurus to help me on this.
Thanks
Vishwas (2 Replies)
Discussion started by: loggedout
2 Replies
5. Shell Programming and Scripting
Hi guys,
I want to find the number of records in a particular file and store that value in any other variable. I am trying this below command but it is not working and giving me an error "Uninary Operator Expected".
say I have taken a variable name 'count' in which I have to store the no. of... (7 Replies)
Discussion started by: dtidke
7 Replies
6. UNIX for Advanced & Expert Users
Hi,
In a file I have data like...
-rw-r----- 1 ftpuser users 1036695 Jul 6 14:59 ./APRIL 2007/Ujjain/My Disc (D)/9565DW07.04B
-rw-r----- 1 ftpuser users 124080 Jul 6 14:59 ./APRIL 2007/Vadodara/vad_APRIL07/2082DW07.04B
The above data is extracted using "find . -name... (12 Replies)
Discussion started by: ronald_brayan
12 Replies
7. UNIX for Advanced & Expert Users
Hi All,
Please help me in writting the script
File contains:
=========
11424444, <basicpage>
jfalfksf
<dateofbirth>10/02/2005</dateofbrith>
jkaklgja
lg'd
....
11423224444, <basicpage>
jfalfksf
<dateofbirth>11/02/2005</dateofbrith>
jkaklgja
lg'd
11433523224444, <basicpage>... (1 Reply)
Discussion started by: thaduka
1 Replies
8. UNIX for Dummies Questions & Answers
Hi All,
Can anyone please help me in unix command
Query:
====
File contains data along with date and time stamp like,
..
Date: 08:23:2005 01:00:00
method: xyz
init variables
Date 08:23:2005 01:00:01
method: xyz
finished init variable
.... (2 Replies)
Discussion started by: thaduka
2 Replies
9. Solaris
I need to get a few details from the command line. I need to get the kilobytes per second that my server is transfering to another or has available and I need to test the connection to make sure that its a sound connection. I also need to keep track of the response time.
I have been playing... (1 Reply)
Discussion started by: nowayin
1 Replies
10. UNIX for Dummies Questions & Answers
I need to know how to enter a unix path in a cgi script for a guest book:
example:
My URL is http://www.kitachi.info
I have an html file in the main folder on my site, the file is called :
gbook.html
what would the correct unix path for this file be ???
the part of the script... (1 Reply)
Discussion started by: akitachi
1 Replies
SED(1) General Commands Manual SED(1)
NAME
sed - stream editor
SYNOPSIS
sed [ -gln ] [ -e script ] [ -f sfile ] [ file ... ]
DESCRIPTION
Sed copies the named files (standard input default) to the standard output, edited according to a script of commands. The -f option causes
the script to be taken from file sfile; these options accumulate. If there is just one -e option and no -f's, the flag -e may be omitted.
The -n option suppresses the default output; -g causes all substitutions to be global, as if suffixed g. The -l option causes sed to flush
its output buffer after every newline.
A script consists of editing commands, one per line, of the following form:
[address [, address] ] function [argument ...]
In normal operation sed cyclically copies a line of input into a pattern space (unless there is something left after a command), applies in
sequence all commands whose addresses select that pattern space, and at the end of the script copies the pattern space to the standard out-
put (except under -n) and deletes the pattern space.
An address is either a decimal number that counts input lines cumulatively across files, a that addresses the last line of input, or a con-
text address, /regular-expression/, in the style of regexp(7), with the added convention that matches a newline embedded in the pattern
space.
A command line with no addresses selects every pattern space.
A command line with one address selects each pattern space that matches the address.
A command line with two addresses selects the inclusive range from the first pattern space that matches the first address through the next
pattern space that matches the second. (If the second address is a number less than or equal to the line number first selected, only one
line is selected.) Thereafter the process is repeated, looking again for the first address.
Editing commands can be applied to non-selected pattern spaces by use of the negation function (below).
An argument denoted text consists of one or more lines, all but the last of which end with to hide the newline. Backslashes in text are
treated like backslashes in the replacement string of an command, and may be used to protect initial blanks and tabs against the stripping
that is done on every script line.
An argument denoted rfile or wfile must terminate the command line and must be preceded by exactly one blank. Each wfile is created before
processing begins. There can be at most 120 distinct wfile arguments.
a
text Append. Place text on the output before reading the next input line.
b label Branch to the : command bearing the label. If label is empty, branch to the end of the script.
c
text Change. Delete the pattern space. With 0 or 1 address or at the end of a 2-address range, place text on the output. Start
the next cycle.
d Delete the pattern space. Start the next cycle.
D Delete the initial segment of the pattern space through the first newline. Start the next cycle.
g Replace the contents of the pattern space by the contents of the hold space.
G Append the contents of the hold space to the pattern space.
h Replace the contents of the hold space by the contents of the pattern space.
H Append the contents of the pattern space to the hold space.
i
text Insert. Place text on the standard output.
n Copy the pattern space to the standard output. Replace the pattern space with the next line of input.
N Append the next line of input to the pattern space with an embedded newline. (The current line number changes.)
p Print. Copy the pattern space to the standard output.
P Copy the initial segment of the pattern space through the first newline to the standard output.
q Quit. Branch to the end of the script. Do not start a new cycle.
r rfile Read the contents of rfile. Place them on the output before reading the next input line.
s/regular-expression/replacement/flags
Substitute the replacement string for instances of the regular-expression in the pattern space. Any character may be used
instead of For a fuller description see regexp(7). Flags is zero or more of
g Global. Substitute for all non-overlapping instances of the regular expression rather than just the first one.
p Print the pattern space if a replacement was made.
w wfile
Write. Append the pattern space to wfile if a replacement was made.
t label Test. Branch to the command bearing the label if any substitutions have been made since the most recent reading of an input
line or execution of a If label is empty, branch to the end of the script.
w wfile
Write. Append the pattern space to wfile.
x Exchange the contents of the pattern and hold spaces.
y/string1/string2/
Transform. Replace all occurrences of characters in string1 with the corresponding character in string2. The lengths of
string1 and string2 must be equal.
!function Don't. Apply the function (or group, if function is only to lines not selected by the address(es).
: label This command does nothing; it bears a label for b and t commands to branch to.
= Place the current line number on the standard output as a line.
{ Execute the following commands through a matching only when the pattern space is selected.
An empty command is ignored.
EXAMPLES
sed 10q file
Print the first 10 lines of the file.
sed '/^$/d'
Delete empty lines from standard input.
sed 's/UNIX/& system/g'
Replace every instance of by
sed 's/ *$// drop trailing blanks
/^$/d drop empty lines
s/ */ replace blanks by newlines
/g
/^$/d' chapter*
Print the files chapter1, chapter2, etc. one word to a line.
nroff -ms manuscript | sed '
${
/^$/p if last line of file is empty, print it
}
//N if current line is empty, append next line
/^
$/D' if two lines are empty, delete the first
Delete all but one of each group of empty lines from a formatted manuscript.
SOURCE
/src/cmd/sed.c
SEE ALSO
ed(1), grep(1), awk(1), lex(1), sam(1), regexp(7)
L. E. McMahon, `SED -- A Non-interactive Text Editor', Unix Research System Programmer's Manual, Volume 2.
BUGS
If input is from a pipe, buffering may consume characters beyond a line on which a command is executed.
SED(1)