Sponsored Content
Top Forums Shell Programming and Scripting any savant ? using AWK/SED to remove newline character between two strings : conditional removal Post 302501179 by Chubler_XL on Wednesday 2nd of March 2011 09:40:53 PM
Old 03-02-2011
Two approaches:

Code:
awk '/^End [Tt]ransaction/&&g==3{print "";g++}g==3{printf $0; next}/^Begin Transaction/{g++} 1' infile

Code:
awk 'NR==3{f=split($0,A,"\n");print A[1];for(i=2;i<f;)printf A[i++];$0="\n"A[f]} $0=$0"\n"' RS= infile

Both the 2nd solution here and bartus11's post above rely on a blank line after the End line. Unlike Bartus11's solution the 2nd solution here ensures the Beg and End lines aren't joined up with the rest of the text, and restores the blank line after then End line.

Last edited by Chubler_XL; 03-02-2011 at 11:23 PM..
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Special Character SED/AWK removal

I have a script that produces an output containing '/.ssh'. I am trying to find a way of parsing only this data from a single line, without removing any other special characters contained within the output as a result of the parse. Any help would be appreciated (6 Replies)
Discussion started by: Raggedranger333
6 Replies

2. Shell Programming and Scripting

sed/awk remove newline

Hi, I have input file contains sql queries i need to eliminate newlines from it. when i open it vi text editor and runs :%s/'\n/'/g it provides required result. but when i run sed command from shell prompt it doesn't impact outfile is still same as inputfile. shell] sed -e... (6 Replies)
Discussion started by: mirfan
6 Replies

3. Shell Programming and Scripting

sed help with character removal

Hello I've got a string of text with a number in pence, e.g. 0.52p, I need to remove the 'p' so that it just reads 0.52 without of course removing all the other 'p' characters. Many thanks (1 Reply)
Discussion started by: mrpugster
1 Replies

4. Shell Programming and Scripting

Remove newline character between two delimiters

hi i am having delimited .dat file having content like below. test.dat(5 line of records) ====== PT2~Stag~Pt2 Stag Test. Updated~PT2 S T~Area~~UNCEF R20~~2012-05-24 ~2014-05-24~~ PT2~Stag y~Pt2 Stag Test. Updated~PT2 S T~Area~METR~~~2012-05-24~2014-05-24~~test PT2~Pt2 Stag Test~~PT2 S... (4 Replies)
Discussion started by: sushine11
4 Replies

5. Shell Programming and Scripting

awk or sed script to remove strings

Below am trying to separate FA-7A:1, In output file it should display 7A 1 Command am using Gives same output as below format: 22B7 10000000c9720873 0 22B7 10000000c95d5d8b 0 22BB 10000000c97843a2 0 22BB 10000000c975adbd 0 Not showing FA ports as required format... (5 Replies)
Discussion started by: aix_admin_007
5 Replies

6. Shell Programming and Scripting

Want to remove / and character using awk or sed

Below i am trying to remove "/" and "r" from the output, so i need output as: hdiskpower3 hdisk0 hdisk1 #inq | grep 5773 | awk '{print $1}' | sed 's/dev//g' | awk -F"/" '{$1=$1}1' .....................................................//rhdiskpower0 //rhdiskpower1 //rhdiskpower2... (3 Replies)
Discussion started by: aix_admin_007
3 Replies

7. Shell Programming and Scripting

Remove last newline character..

Hi all.. I have a text file which looks like below: abcd efgh ijkl (blank space) I need to remove only the last (blank space) from the file. When I try wc -l the file name,the number of lines coming is 3 only, however blank space is there in the file. I have tried options like... (14 Replies)
Discussion started by: Sathya83aa
14 Replies

8. UNIX for Dummies Questions & Answers

Extracting 22-character strings from text using sed/awk?

Here is my task, I feel sure this can be accomplished with see/awk but can't seem to figure out how. I have large flat file from which I need to extract every case of a pairing of characters (GG) in this case PLUS the previous 20 characters. The output should be a list (which I plan to make... (17 Replies)
Discussion started by: Twinklefingers
17 Replies

9. Shell Programming and Scripting

How to remove certain character strings with awk?

Hi all, I need to remove DBPATH= and /db from the string below using awk (or sed, as it also exists on the machine). Input: DBPATH=/some/path/database/db Desired output: /some/path/database Thank you! (8 Replies)
Discussion started by: ejianu
8 Replies

10. Shell Programming and Scripting

How to remove newline character if it is the only character in the entire file.?

I have a file which comes every day and the file data look's as below. Vi abc.txt a|b|c|d\n a|g|h|j\n Some times we receive the file with only a new line character in the file like vi abc.txt \n (8 Replies)
Discussion started by: rak Kundra
8 Replies
A2P(1)							 Perl Programmers Reference Guide						    A2P(1)

NAME
a2p - Awk to Perl translator SYNOPSIS
a2p [options] [filename] DESCRIPTION
A2p takes an awk script specified on the command line (or from standard input) and produces a comparable perl script on the standard output. OPTIONS Options include: -D<number> sets debugging flags. -F<character> tells a2p that this awk script is always invoked with this -F switch. -n<fieldlist> specifies the names of the input fields if input does not have to be split into an array. If you were translating an awk script that processes the password file, you might say: a2p -7 -nlogin.password.uid.gid.gcos.shell.home Any delimiter can be used to separate the field names. -<number> causes a2p to assume that input will always have that many fields. -o tells a2p to use old awk behavior. The only current differences are: o Old awk always has a line loop, even if there are no line actions, whereas new awk does not. o In old awk, sprintf is extremely greedy about its arguments. For example, given the statement print sprintf(some_args), extra_args; old awk considers extra_args to be arguments to "sprintf"; new awk considers them arguments to "print". "Considerations" A2p cannot do as good a job translating as a human would, but it usually does pretty well. There are some areas where you may want to examine the perl script produced and tweak it some. Here are some of them, in no particular order. There is an awk idiom of putting int() around a string expression to force numeric interpretation, even though the argument is always integer anyway. This is generally unneeded in perl, but a2p can't tell if the argument is always going to be integer, so it leaves it in. You may wish to remove it. Perl differentiates numeric comparison from string comparison. Awk has one operator for both that decides at run time which comparison to do. A2p does not try to do a complete job of awk emulation at this point. Instead it guesses which one you want. It's almost always right, but it can be spoofed. All such guesses are marked with the comment ""#???"". You should go through and check them. You might want to run at least once with the -w switch to perl, which will warn you if you use == where you should have used eq. Perl does not attempt to emulate the behavior of awk in which nonexistent array elements spring into existence simply by being referenced. If somehow you are relying on this mechanism to create null entries for a subsequent for...in, they won't be there in perl. If a2p makes a split line that assigns to a list of variables that looks like (Fld1, Fld2, Fld3...) you may want to rerun a2p using the -n option mentioned above. This will let you name the fields throughout the script. If it splits to an array instead, the script is probably referring to the number of fields somewhere. The exit statement in awk doesn't necessarily exit; it goes to the END block if there is one. Awk scripts that do contortions within the END block to bypass the block under such circumstances can be simplified by removing the conditional in the END block and just exiting directly from the perl script. Perl has two kinds of array, numerically-indexed and associative. Perl associative arrays are called "hashes". Awk arrays are usually translated to hashes, but if you happen to know that the index is always going to be numeric you could change the {...} to [...]. Iteration over a hash is done using the keys() function, but iteration over an array is NOT. You might need to modify any loop that iterates over such an array. Awk starts by assuming OFMT has the value %.6g. Perl starts by assuming its equivalent, $#, to have the value %.20g. You'll want to set $# explicitly if you use the default value of OFMT. Near the top of the line loop will be the split operation that is implicit in the awk script. There are times when you can move this down past some conditionals that test the entire record so that the split is not done as often. For aesthetic reasons you may wish to change index variables from being 1-based (awk style) to 0-based (Perl style). Be sure to change all operations the variable is involved in to match. Cute comments that say "# Here is a workaround because awk is dumb" are passed through unmodified. Awk scripts are often embedded in a shell script that pipes stuff into and out of awk. Often the shell script wrapper can be incorporated into the perl script, since perl can start up pipes into and out of itself, and can do other things that awk can't do by itself. Scripts that refer to the special variables RSTART and RLENGTH can often be simplified by referring to the variables $`, $& and $', as long as they are within the scope of the pattern match that sets them. The produced perl script may have subroutines defined to deal with awk's semantics regarding getline and print. Since a2p usually picks correctness over efficiency. it is almost always possible to rewrite such code to be more efficient by discarding the semantic sugar. For efficiency, you may wish to remove the keyword from any return statement that is the last statement executed in a subroutine. A2p catches the most common case, but doesn't analyze embedded blocks for subtler cases. ARGV[0] translates to $ARGV0, but ARGV[n] translates to $ARGV[$n-1]. A loop that tries to iterate over ARGV[0] won't find it. ENVIRONMENT
A2p uses no environment variables. AUTHOR
Larry Wall <larry@wall.org> FILES
SEE ALSO
perl The perl compiler/interpreter s2p sed to perl translator DIAGNOSTICS
BUGS
It would be possible to emulate awk's behavior in selecting string versus numeric operations at run time by inspection of the operands, but it would be gross and inefficient. Besides, a2p almost always guesses right. Storage for the awk syntax tree is currently static, and can run out. perl v5.14.2 2010-12-30 A2P(1)
All times are GMT -4. The time now is 08:17 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy