Could you please try with following and let me know if this helps you.
Let's say following is the Input_file1 and Input_file2.
Then following code may help you.
Output will be as follows.
Thanks,
R. Singh
If my file looks like this….
10
20
30
and I want to take each line individually and put it in a variable so it can be read
later in it's on individual test statement, how can I do that? I guess what I'm asking is how can I extract each line individually.
Thanks (5 Replies)
Dear All,
I have to extract a a few lines from a log file and I know the starting String and end string(WHich is same ). Is there any simplere way using sed - awk.
e.g. from the following file
--------------------------------------
Some text
Date: 21 Oct 2008
Text to be extracted... (8 Replies)
Hi,
I have some ps files where I want to ectract/copy a certain number from and use that number to rename the ps file.
eg:
'file.ps' contains following text:
14 (09 01 932688 0)t
the text can be variable, the only fixed element is the '14 ('. The problem is that the fixed element can appear... (7 Replies)
Hi,
I need help searching through a large text file. I need to find a certain string within the text, and copy each line until another string appears.
The file looks like this:
>scf15164843
ATTAAAGGNNNGGAATTTCCCCAA
ATTACCGGCTTTAAANNNTTACCC
>scf15154847
CCGGGNNNTTTAAACCCGNGNGCC... (2 Replies)
I have a tab delimited text file that I want to cut columns 3,4,5 from. Then I want to paste these columns into a space delimited text file between columns 2 and 3. I still want to keep the space delimited format in the final text file. How do I go about doing that? Thanks! (1 Reply)
I would like to extract the last column of a text file but different rows of the text file have different numbers of columns. How do I go about doing that? Thanks! (1 Reply)
Hello I have a large file with lines beginning with 552, 553, 554, below is a small sample, I need to extract the data you can see below highlighted in bold from this file on the same location on every line and output it to a new file.
Thank you in advance for any help
55201KL... (2 Replies)
Hi,
I am trying to extract lines from a text file given a text file containing line numbers to be extracted from the first file. How do I go about doing this? Thanks! (1 Reply)
I'm trying to find a Bourne shell script that will copy files from one directory using a wild card for the file name (*) and add some more characters in the middle of the file name as it is copied. As an example:
/u01/tmp-file1.xml => /u02/tmp-file1-20130620.xml
/u01/tmp-file2.xml => ... (6 Replies)
Hello,
I have a file called COMPLIST as follows that contains 4 digit numbers.0002
0003
0010
0013
0015
0016
0022
0023
0024
0025
0027
0030
0031
0032
0033
0035
0038
0041 (3 Replies)
Discussion started by: sph90457
3 Replies
LEARN ABOUT CENTOS
a2p
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 v5.16.3 2013-03-04 A2P(1)