Visit Our UNIX and Linux User Community


to join the corresponding lines using shell commands or awk


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting to join the corresponding lines using shell commands or awk
# 8  
Old 12-10-2007
I didn't mean the awk script - I meant the awk interpreter.
' RS="" ' works fine under Solaris' 'nawk', but does not work under Cygwin's 'gawk' - hence dirrent script implementation.

Previous Thread | Next Thread
Test Your Knowledge in Computers #292
Difficulty: Easy
In 2011, Google introduced the Chromebook, a web thin client running Android..
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Join, merge, fill NULL the void columns of multiples files like sql "LEFT JOIN" by using awk

Hello, This post is already here but want to do this with another way Merge multiples files with multiples duplicates keys by filling "NULL" the void columns for anothers joinning files file1.csv: 1|abc 1|def 2|ghi 2|jkl 3|mno 3|pqr file2.csv: 1|123|jojo 1|NULL|bibi... (2 Replies)
Discussion started by: yjacknewton
2 Replies

2. Shell Programming and Scripting

awk or a combination of commands to read and calculate nth lines from pattern

Two numerical lines, found by either header line, need to be added and the total placed in a new-header section. Also the total should should be rounded or cut to a two decimal anynumber.XX format with the AB string added on the end. For example: The numerical lines from headers 2 and 3 are... (3 Replies)
Discussion started by: jessandr
3 Replies

3. UNIX for Beginners Questions & Answers

Sed/awk join lines once pattern found

Hi all OS - RHEL6.4 I have input file -f1.txt I need to search line which starts with \Start and read next line till it gets blank line and join them all. I need to trim any trailing spaces for each line.So output.txt should be.. \Start\now\fine stepwatch this space for toolsends... (7 Replies)
Discussion started by: krsnadasa
7 Replies

4. Shell Programming and Scripting

awk join lines based on keyword

Hello , I will need your help once again. I have the following file: cat file02.txt PATTERN XXX.YYY.ZZZ. 500 ROW01 aaa. 300 XS 14 ROW 45 29 AS XD.FD. PATTERN 500 ZZYN002 ROW gdf gsste ALT 267 fhhfe.ddgdg. PATTERN ERE.MAY. 280 PATTERRNTH 5000 rt.rt. ROW SO a 678 PATTERN... (2 Replies)
Discussion started by: alex2005
2 Replies

5. Shell Programming and Scripting

Join lines using sed or awk

Hi, I have text file that looks like this: blabla bla PATTERN LINE1 LINE2 bla bla bla PATTERN LINE1 LINE2 bla PATTERN LINE1 LINE2 bla (9 Replies)
Discussion started by: hench
9 Replies

6. UNIX for Dummies Questions & Answers

How to use shell commands within awk?

Hey guys i want to use shell commands like ls, find, cd and more with in awk statements with inputs from the awk variables. Like in the below code how can i change the directory using the value of path. Please suggest awk '{ while (i<NR) { i++; percentage = $5; path = $6; ... (2 Replies)
Discussion started by: rishi90
2 Replies

7. Shell Programming and Scripting

Using shell commands in awk

Hi, I've searched this site and the wider web and have not found anything (that I can understand..) that helps me. I've used shell commands in awk fine in the past, the difference is that I want to pass the shell command a field variable within awk from the current input. A simple example... (3 Replies)
Discussion started by: Ronnie717
3 Replies

8. Shell Programming and Scripting

How to get awk to edit in place and join all lines in text file

Hi, I lack the utter fundamentals on how to craft an awk script. I have hundreds of text files that were mangled by .doc format so all the lines are broken up so I need to join all of the lines of text into a single line. Normally I use vim command "ggVGJ" to join all lines but with so many... (3 Replies)
Discussion started by: n00ti
3 Replies

9. UNIX for Dummies Questions & Answers

Join 2 files with multiple columns: awk/grep/join?

Hello, My apologies if this has been posted elsewhere, I have had a look at several threads but I am still confused how to use these functions. I have two files, each with 5 columns: File A: (tab-delimited) PDB CHAIN Start End Fragment 1avq A 171 176 awyfan 1avq A 172 177 wyfany 1c7k A 2 7... (3 Replies)
Discussion started by: InfoSeeker
3 Replies

10. Shell Programming and Scripting

Awk Join multiple lines

Hi, I have data with broken lines: Sample data: "12"|"25"|"a"|"b"|"c"|"d"|"e"|"f"|"2453748"|"08:10:50" "16"|"25"|"a"|"b"|"c"|"d"|"e"|"f"|" 2453748"|"08:15:50" "16"|"25"|"a"|"b"|" c"|"d"|"e"|"f"|"2453748"|"08:19:50" "16"|"25"|"a"|"b"|"c"|"d"|"e"|"f"|"2453748"|"08:19:50" In the... (5 Replies)
Discussion started by: hitmansilentass
5 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 out- put. 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: * Old awk always has a line loop, even if there are no line actions, whereas new awk does not. * 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 inte- ger 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 [...]. Itera- tion 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 the array base $[ from 1 back to perl's default of 0, but remember to change all array sub- scripts AND all substr() and index() operations 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]. 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 v5.8.9 2005-03-10 A2P(1)

Featured Tech Videos